Штукатурка при отрицательных температурах: Штукатурка зимой при минусовой температуре: технология, виды

Штукатурка фасадная морозостойкая: свойства и советы специалистов

Содержание статьи:

Фасадные штукатурки часто применяются для облицовки наружных стен частных домов. Требования к техническим характеристикам отделочных смесей различны в разных регионах. В областях с суровыми климатическими условиями необходимо использовать морозостойкие материалы, способные сохранять свои эксплуатационные параметры даже при низких температурах. Важным достоинством морозостойких штукатурок является то, что наноситься на основание они могут не только при положительных, но также и при отрицательных температурах, в зависимости от марки и производителя, использовать штукатурку для отделки наружных стен можно при температуре окружающей среды до -20 градусов по Цельсию.

Особенности морозостойких смесей

Морозостойкие фасадные штукатурки также называют зимними смесями, в состав которых входят специальные отвердители и другие компоненты, обеспечивающие весь набор технических характеристик таких отделочных материалов. У морозостойких штукатурок можно выделить множество положительных качеств, особенно, если сравнивать их со стандартными, «летними» составами. В таблице ниже перечислены основные достоинства современных морозостойких штукатурок для наружных работ.

Особенности	Описание
Продолжительная эксплуатация.	В отличие от стандартных фасадных смесей, гарантия на которые обычно составляет от 3-х до 5-ти лет, морозостойкие штукатурки, в частности смесь марки ТИМ 26, способны сохранять свои внешние и эксплуатационные характеристики на протяжении 10, 20 и более лет.
Водопроницаемость.	По уровню защиты от влаги, морозостойкие штукатурки во многом идентичны водонепроницаемым составам, из-за чего их часто называют универсальными облицовочными средствами для проведения наружных работ в любых внешних условиях.
Стойкость к температуре.	Штукатурка ТИМ 26 и аналогичные облицовочные смеси, отличается высокой стойкостью к наружным температурным условиям. Такие облицовки могут сохранять свои характеристики в диапазоне температур от -50 до +70 градусов Цельсия. Благодаря такой стойкости, штукатурка ТИМ 26 может использоваться во всех регионах нашей страны.
Скорость высыхания.	Благодаря составу и современным технологиям производства, морозостойкая фасадная облицовка отличается высокой скоростью высыхания даже в неблагоприятных условиях. ТИМ 26 схватывается уже через несколько часов с момента нанесения на основание, а полное высыхание происходит в течение суток.
Гибкость.	ТИМ 26 отличается прекрасной эластичностью, сохраняет свои технические характеристики в любых условиях и не трескается даже при самых низких температурах окружающей среды, чем не могут похвастаться стандартные штукатурные смеси.

Но не стоит думать, что у зимних отделочных материалов для наружных работ нет недостатков. Отрицательные качества есть у любых отделок, даже если речь идет не о штукатурках. Важной особенностью зимних смесей является то, что с ними значительно сложнее работать, облицовка тяжелее стандартной, кроме того, при монтаже можно использовать только широкие форсунки, из-за чего количество вариантов дизайна фасада несколько сокращается.

Монтаж смесей

Отделочные работы с помощью штукатурок при минусовых температурах могут проводиться не только в регионах, где сложно дождаться солнечного дня, но и в областях средней полосы, ведь необходимость в облицовке может возникнуть в любое время, а ждать лета не всегда возможно. В любом случае, где бы ни проводился монтаж и какую бы температуру не показывал градусник, проводить отделку морозостойкой штукатуркой нужно в соответствии с определенной технологией.

Как и в работе со стандартными смесями, перед нанесением штукатурки, собственник должен тщательно подготовить поверхность основания. В зависимости от материала, из которого выстроены стены и возможностями монтажника, очистку стен можно проводить с помощью различных подручных средств. Чаще всего для этого используют шлифовальные машины, а также дрели со щетками по металлу и другими насадками.

Важным условием использования морозостойкой штукатурки ТИМ 26 или другой, является предварительное обезжиривание рабочей поверхности, а также последующая сушка.

Смесь следует наносить на наружную поверхность слоем до 20 мм, при большем объеме смеси, могут возникать различные проблемы с ее затвердеванием, в условиях отрицательной температуры это может быть особенно заметно. Чтобы облицовка надежнее крепилась к основанию, на поверхности кирпичных и бетонных стен рекомендуется делать густые насечки, способные продлить срок службы отделки.

Касательно густоты смеси существуют различные мнения, в первую очередь, собственнику следует соблюдать инструкции производителя, однако, нужно учитывать и то, что в зависимости от температуры окружающей среды, лучше себя показывать могут разные консистенции одной и той же смеси. Для использования в зимнее время года, при отрицательных температурах, рекомендуется замешивать штукатурку для работы из соотношения 1 литр воды на 200 грамм облицовки.

Советы специалистов

Чтобы в процессе отделки наружных стен у собственника возникало, как можно меньше неприятных ситуаций и не было допущено грубых ошибок, следует обратиться к опыту профессиональных строителей, которые по долгу своей службы часто имеют дело с морозостойкими штукатурками ТИМ 26 и другими составами.

В первую очередь, нужно учитывать, что при подготовке наружного основания к работе, нельзя использовать воду, мокрое основание под воздействием низкой температуры быстро покрывается льдом, что сделает невозможным дальнейшую работу. Разбавлять сильно смесь водой также не рекомендуется, из-за той же опасности замерзания жидкости из-за холода.

Работа на морозе отличается различными сложностями и неприятностями, рекомендуется заранее подготовить теплые перчатки, так как в стандартных резиновых, провести монтаж будет практически невозможно. Помимо прочего, не стоит разводить сразу большое количество смеси, при низких температурах ТИМ 26 или другая морозостойкая смесь может быстро потерять свои эксплуатационные характеристики.

90000 When is body temperature too low? 90001 Skip to content 90002 90003 Search 90004 90003 Cart 90004 90003 Admin 90004 90009 90010 HEALTH TOPICS ▼ 90011 Browse by Topic 90012 90002 90003 Heart Health «Back 90002 90003 Blood Pressure 90004 90003 Cholesterol 90004 90003 Coronary Artery Disease 90004 90003 Heart Attack 90004 90003 Heart Failure 90004 90003 Heart Medications 90004 90003 Stroke 90004 90009 90004 90003 Mind & Mood «Back 90002 90003 Addiction 90004 90003 Adult & Child ADHD 90004 90003 Alzheimer’s & Dementia 90004 90003 Anxiety 90004 90003 Depression 90004 90003 Improving Memory 90004 90003 Mental Health 90004 90003 Positive Psychology 90004 90003 Stress 90004 90009 90004 90003 Pain «Back 90002 90003 Arthritis 90004 90003 Back Pain 90004 90003 Headache 90004 90003 Joint Replacement 90004 90003 Other Pain 90004 90009 90004 90003 Staying Healthy «Back 90002 90003 Aging 90004 90003 Balance & Mobility 90004 90003 Diet & Weight Loss 90004 90003 Energy & Fatigue 90004 90003 Exercise & Fitness 90004 90003 Healthy Eating 90004 90003 Physical Activity 90004 90003 Screening Tests for Men 90004 90003 Screening Tests for Women 90004 90003 Sleep 90004 90009 90004 90003 Cancer «Back 90002 90003 Breast Cancer 90004 90003 Colorectal Cancer 90004 90003 Other Cancers 90004 90003 Prostate Health & Disease 90004 90003 Skin Cancer 90004 90009 90004 90003 Diseases & Conditions «Back 90002 90003 Adult & Child ADHD 90004 90003 Alzheimer’s & Dementia 90004 90003 Diabetes 90004 90003 Digestive Health 90004 90003 Heart Disease 90004 90003 More Diseases & Conditions 90004 90003 Osteoporosis 90004 90003 Stroke 90004 90003 Thyroid Diseases 90004 90009 90004 90003 Men’s Health «Back 90002 90003 Birth Control 90004 90003 Erectile Dysfunction 90004 90003 Exercise & Fitness 90004 90003 Healthy Eating 90004 90003 Men’s Sexual Health 90004 90003 Prostate Cancer 90004 90003 Prostate Health & Disease 90004 90003 Screening Tests for Men 90004 90009 90004 90003 Women’s Health «Back 90002 90003 Birth Control 90004 90003 Breast Health & Disease 90004 90003 Exercise & Fitness 90004 90003 Healthy Eating 90004 90003 Menopause 90004 90003 Osteoporosis 90004 90003 Pregnancy 90004 90003 Screening Tests for Women 90004 90003 Women’s Sexual Health 90004 90009 90004 90003 Children’s Health «Back 90002 90003 Adult & Child ADHD 90004 90003 Autism 90004 90003 Developmental Milestones 90004 90003 Learning Disabilities 90004 90003 90004 90009 90004 90009.90000 What is Normal Body Temperature? Low vs. High, Normal Range 90001 Skip to main content 90002 Close 90003 90004 90005 Coronavirus Update 90006 90005 Check Your Symptoms 90006 90005 Find A Doctor 90006 90005 Find A Dentist 90006 90005 Find Lowest Drug Prices 90006 90015 90004 90005 Health 90018 A-Z 90002 Close 90003 Health A-Z Common Conditions 90021 90022 ADD / ADHD 90006 90022 Allergies 90006 90022 Arthritis 90006 90022 Cancer 90006 90022 Coronavirus (COVID-19) 90006 90022 Depression 90006 90022 Diabetes 90006 90022 Eye Health 90006 90022 Heart Disease 90006 90022 Lung Disease 90006 90022 Orthopedics 90006 90022 Pain Management 90006 90022 Sexual Conditions 90006 90022 Skin Problems 90006 90022 Sleep Disorders 90006 90022 View All 90006 90015 Resources 90055 90022 Symptom Checker 90006 90022 WebMD Blogs 90006 90022 Podcasts 90006 90022 Message Boards 90006 90022 Questions & Answers 90006 90022 Insurance Guide 90006 90022 Find a Doctor 90006 90022 Children’s Conditions A-Z 90006 90022 Surgeries and Procedures A-Z 90006 90015 90075 Featured Topics 90005 90077 Symptom Checker COVID-19: Check Your Symptoms Now 90006 90005 90080 Slideshow Get Help for Migraine Relief 90006 90015 90006 90005 Drugs & 90018 Supplements 90002 Close 90003 Drugs & Supplements Find & Review 90021 90022 Drugs 90006 90022 Supplements 90006 90015 Tools 90055 90022 Manage Your Medications 90006 90022 Pill Identifier 90006 90022 Check for Interactions 90006 90015 Drug Basics & Safety 90102 90006 90015.90000 Guide to Painting New Plaster 90001 90002 This page forms part of our blog which contains a series of DIY guides for consumers and homeowners. 90003 90002 We recently updated our price guides for plastering and wall soundproofing and realised that many homeowners may choose to save money by doing the painting and decorating themselves. 90003 90002 Whether you’ve just had a wall soundproofed, patch repaired or completely replastered, we hope you’ll find our guide to plaster drying times helpful.90003 90008 Wet Vs Dry Plaster Colour 90009 90002 The two colours below show the difference between wet and dry plaster: 90003 90012 90002 Wet plaster often looks like this, although it depends on the exact mixture 90003 90015 90002 Dry plaster is much lighter in colour with hints of pink 90003 90002 90019 Wet plaster 90020 looks earthy with hints of brown, red or dark pink. 90003 90002 90019 Dry plaster 90020 is light creamy pink. 90003 90008 Why You Need to Wait 90009 90002 If you intend to paint your newly plastered walls, it’s vital that you wait until the wall is completely dry.90003 90002 Most paints will seal the surface of the wall and any moisture will be contained within the wall. 90003 90002 This can lead to damp patches, mould and in some cases efflorescence (salting). 90003 90008 Plaster Drying Time 90009 90002 There is no fixed drying time for plaster and the time you’ll need to wait before decorating will depend on these factors: 90003 90038 90039 how many layers of plaster were applied 90040 90039 if there’s plasterboard backing 90040 90039 the humidity of the room 90040 90039 the time of year 90040 90047 90002 For patch repairs where there’s only a thin layer of plaster, you should wait around 5-6 days.90003 90002 For entire walls, plaster on plasterboard will dry quite quickly and you should wait around 10-14 days before applying a mist coat. 90003 90002 For a wall with two or three layers of plaster (often referred to as backing plaster), you should wait around 14-21 days. 90003 90002 If the property is damp, has lots of moisture in the air, or the work is carried out in the winter, you should increase the drying time by around 50%. 90003 90008 Radiators and Dehumidifiers 90009 90002 Dehumidifiers should never be used to speed up the drying time of plaster.90003 90002 The drying process is actually a reaction between several chemicals that are created when you add water. 90003 90002 If the water is extracted too quickly from the plaster, the chemical reaction will stop prematurely and the plaster will not harden correctly and you’ll get hairline cracks. 90003 90002 Radiators should not be used either unless the room is particularly cold or damp (winter) and even then care should be taken as any fresh plaster behind or close to the radiator may dry out too quickly.90003 90002 The one thing you should do is to open at least one window in each room that has been plastered, this will allow any moisture to escape. 90003 90008 Mist Coat 90009 90002 A mist coat is a name given to the first layer of paint that’s applied to a new plaster wall. 90003 90002 For most walls, this will be a mixture of one part water and three parts emulsion. Some decorators dilute the paint to 50% water and 50% paint although you may need two mist coats at this level of dilution. 90003 90002 Neutral colours are recommended.90003 90002 A mist coat is just another term used to describe a primer. 90003 90008 What Happens if You Do not Apply a Mist Paint Coat? 90009 90002 Dry plaster is extremely porous and will rapidly absorb any moisture from the paint. 90003 90002 To prevent the paint from peeling off, the first coat should be watered down, if it is not you can expect the paint to dry too quickly and it may peel off. 90003 90008 In a Hurry? 90009 90002 If you really need to get the fresh plaster painted as soon as possible and you can not afford to wait a couple of weeks, you do have one option.90003 90002 There are several paints on sale that allow the wall to breathe, these are water based and are usually labelled as “Supermatt” or “non-vinyl matt” or “contract matt”. 90003 90002 Television makeover and DIY shows use these paints on the same day that the plaster was laid, we suggest that at a minimum you wait at least two days before applying such paints. 90003 90002 Dulux has information about their version here. 90003 90002 Leyland has a similar product here. 90003 90096 90002 The Leyland Trade Contract Matt is formulated specifically for new plaster – it is a highly breathable paint so will therefore allow the plaster to breathe whilst it is drying out.Because of the breathability the paint will mark very easily, and is very absorbent in its own right. if the plaster is still wet I would suggest thinning the 1st coat by 10% clean water and follow up with 2 full coats, then when the plaster has dried apply a thinned down solution of silk (again around 10%) followed by a further full coat. However, if the plaster has fully dried then you can apply a thinned down solution of silk straight to the plaster, followed by 2 full coats. – Leyland representitive 90003 90099 90008 Kitchens and Bathrooms 90009 90002 Because most kitchens and bathrooms have higher levels of humidity, you should consider using an oil-based paint.For plaster walls in these rooms, we recommend sealing the wall with a PVA solution. The combination of PVA and an oil based paint will prevent mould from forming. 90003 90002 Under no circumstances should PVA be used on a wall that will be painted with emulsion (water-based paints). 90003 90008 Do not Want To Do This Work Yourself? 90009 90002 Our partner can supply you with up to three written quotes from rated and reviewed tradespeople in your area. 90003 90002 Hit the button below and fill out the form, this service is free and you’re under no obligation to proceed: 90003 Get a Quote Online.90000 Thermal shock 90001 90002 All Glossary 90003 90002 When sudden changes in temperature cause dimensional changes ceramics often fail because of their brittle nature. Yet some ceramics are highly resistant. 90003 90006 Details 90007 90002 Thermal shock refers to stresses imposed on a ceramic by the volume changes associated with sudden shifts in temperature. Pouring hot coffee into a cup is a classic example, it is a mild thermal shock common to every day use, almost any type of clay product can withstand this (unless internal stresses already present, such as an excessively compressed glaze, just need a trigger to fracture the piece).Putting a frozen casserole into a hot oven is a much more stressful scenario, everyone knows the importance of using special ceramic or glass for this. Subjecting a ceramic pan to an open flame is an even more drastic temperature change, few products can withstand this. 90003 90002 Fired ceramic does not withstand thermal shock nearly as well as other materials like steel, plastic, wood, etc. Ceramic is hard and resistant to abrasion but it is brittle and propagates cracks readily. Common ceramic materials that have low thermal expansions or impart a chemistry useful in the firing of low expansion products are petalite, cordierite, molochite, pyrophyllite, mullite, talc, spodumene, zircon.One company marketing such products classifies these under the umbrella: Thermal and Shock. 90003 90002 Survival of thermal stress can take various forms. If a ceramic simply does not expand on heating and cooling in the temperature range at which the stress is being imposed, it will of course not fail (even though it might have high expansion at other temperature ranges). Or, materials that normally might crack resist doing so because the object made from them is sufficiently thin walled, smooth surfaced and has an even cross section without any sharp contours (these deny cracks a place to start).Another strategy is to make sure the thermal expansion of the glaze complements the body. When bodies are fired to a high degree of vitrifiction they become more brittle, thus a thermal shock prevention mechanism can be to simply fire lower producing a body of less density. Or if the microstructure of the material has alot of pores and aggregate grains, these will act as micro-crack terminators, that means that the substrate of the material will develop a resilience to heat shock that is a product of a crack network within (overall loss in strength is associated with this but sometimes it can be tolerated).An interesting example of this is terra cotta ware made by indigenous people around the world. The open porous nature of the substrate that is a product of the very low firing temperature gives it the ability, in many cases, to even survive an open flame. Of course the natives using these vessels know that the down side of this is that the ware has very poor mechanical durability and can not be glazed, but they accept this tradeoff (actually in many cases they do glaze it using lead compounds). 90003 90002 Ceramic substrates are typically high in quartz and quartz grains experience high expansion and contraction through quartz and cristobalite inversions.Thus where an application demands thermal shock resistance in these temperature ranges, the body must not have undissolved quartz grains in the matrix. Alumina is a similar situation. It too is refractory, but it does not have good thermal shock resistance at higher temperatures (whereas at lower ones it is better). 90003 90002 Thermal shock failure can take on different forms. If typical vitreous porcelains are subjected to an open flame they will simply explode into shards. As their resistance improves they might simply crack in half.Or they might crack, making a distinctive ringing sound, yet on inspection that crack is not visible (but they will have lost the distinctive ring when tapped with a metal object). Some fired ceramic items can withstand many successive thermal shocks but, over time, they gradually weaken and eventually fail. Some materials that can survive sudden heating do not perform as well with sudden cooling. This typically happens when the item is glazed. It is common for the stresses of the glaze shrinking before the underlying body to cause the glaze to crack (called crazing), but the cracks do not propagate through the body.90003 90002 It is fairly easy to test ceramic items for their ability to resist the thermal shock to which they are likely to be exposed. An example is a boiling water: ice water test, or a 300F to ice water test. 90003 90006 Related Information 90007 90022 Shivering is not just a glaze problem with Terra Cotta 90023 90024 90002 Low fire terra cotta mugs have cracked. Why? The white glaze is under compression, its thermal expansion is too low (that is why it is also shivering off the rim).As the piece is cooling the kiln the thick layer of white glaze first solidifies. As cooling proceeds the body shrinks (thermally) at a faster rate than the glaze. The puts the glaze under compression and stretches the body. As some point (e.g. last stages of kiln cooling, a thermal stress during use) the body cracks to relieve the stress (notice how the white glaze is pushing the cracks apart). Neither the body or glaze are at fault, in this case they are simply made by different manufacturers and are thermal expansion incompatible.One solution would be to mix it with a white glaze that is crazing (the opposite problem). Or you could add some nepheline syenite to the glaze to increase its thermal expansion (maybe 10% by dry weight). 90003 90022 A flameware body being tested for thermal shock. Is this a joke? 90023 90029 90002 A recommended flameware recipe from a respected website (equal parts of 35 mesh grog, talc and ball clay). Looks good on paper but mix it up for a surprise. The texture is ridiculously coarse. Recipes like this often employ fire clays and ball clays, but these have high quartz contents (in a test like this a ball clay vessel could easily fail in 5 seconds).But this one is surviving still at the 90-second mark. Or is it? While porcelain pieces fail with a spectacular pop of flying shards, these open-porous bodies fail quietly (note the crack coming up to the rim from the flame). There was an intention to create cordierite crystals (the reason for the talc), it is hard to say whether than happened or not. But the porosity of 12.5% ​​would be difficult to deal with. On the positive side, you could likely continue using this vessel despite the crack. 90003 90022 Stoneware mug endures thermal shock better than kaolin or ball clay 90023 90034 90002 These are fired at cone 10R.The kaolin bowl on the left survived 2 seconds! The ball clay next to it: 4 seconds. The Helmer clay (halloysite / kaolin) next to that: 8 seconds. The white stoneware piece: 14 seconds. A commercial stoneware mug could survive for 50 seconds or better. Thermal shock resistance is a complex subject. Of course, the size, thickness and contour of the ware are important. But many other factors come into play: quartz particle content and size, degree of maturity, thermal expansion of the matrix, homogeneity of the matrix, presence and fit of the glaze, internal structure of the mineral species (if the ware is not vitreous) , their particles sizes and shapes, presence and type of aggregate (or grog), brittleness of the matrix, and more.90003 90022 Thermal shock failure in raw ball clay much worse than the 100 mesh material 90023 90039 90002 The cup on the left is raw, unground, ball clay (Plainsman A2 fired to cone 10 reduction). It cracked under a flame in only 4 seconds. The 200 mesh version on the right lasted 14 seconds (it is broken because I dropped it). It would appear that the larger quartz particles in the material on the left are imparting much less resistance to thermal shock failure. 90003 90022 Thermal shocking kaolin, ball clay, halloysite and porcelain 90023 90044 90002 Left to right (all fired at cone 10): Pure 200 mesh kaolin vitrified at cone 10 cracked in two seconds.Next is a 42 mesh more refractory ball clay, it failed in four seconds. A refractory halloysite / kaolin material failed in eight seconds. A white glazed stoneware failed in 14 seconds. 90003 90022 Dilatometer curve of vitreous porcelain (red) vs. stoneware body 90023 90049 90002 The 500-600C zone is the alpha-beta inversion of quartz. Notice the vitreous body experiences a bigger expansion change there. But in the 100-270C cristobalite inversion region the stoneware undergoes a much more rapid change (especially in the 100-200C zone).This information affects how ware would be refired in production to avoid cracking (slowing down in these two zones). In addition, that stoneware would not be a good choice for an ovenware body. 90051 Photo courtesy of AF 90052 90003 90022 Same body, glaze, thickness, firing. Same thermal shock. Only the tile crazed? 90023 90056 90002 Why did the glaze on the tile craze? It is double the thickness of the walls of the mug. Thus, when quenched in ice water (BWIW test), a greater gradient occurs between the hot interior of the clay and the rapidly cooling surface.90003 90022 The porcelain is harder, but the terra cotta has it beat for thermal shock! 90023 90061 90002 This terra cotta cup (center) is glazed with G2931G clear glaze (Ulexite based) and fired at cone 03. It survives 30 seconds under direct flame against the sidewall and turns red-hot before a fracture occurs (the unglazed one also survived 30 seconds, it only cracked, it did not fracture). The porcelain mug (Plainsman M370) is glazed with G2926B clear, it survived 15 seconds (even though it is much thinner).The porcelain is much more dense and durable, but the porous nature of the earthenware clearly withstands thermal shock much better. It is actually surprisingly durable. 90003 90022 Terra cotta and a surprising thing about thermal shock 90023 90066 90002 This terra cotta cup is glazed with G2931G clear glaze (Ulexite based) and fired at cone 03. It survives 25 seconds under direct flame against the sidewall before a crack occurs. Typical porcelains and stonewares would survive 10 seconds.Super vitreous porcelains 5 seconds. This is an advantage of earthenware. Sudden changes in temperature cause localized thermal expansion, this produces tension and compression that easily cracks most ceramics. But the porous nature of earthenware absorbs it much better. During initial testing I found better performance for glazed earthenware (vs. unglazed), but in later testing they proved to be fairly similar. The TSFL test on consistently size tiles can be used to log more precise results. 90003 90022 A dunting crack 90023 90071 90002 Example of a dunting crack in a flat deep cone 6 porcelain bowl.The bowl has a wide bottom that heat-sinks to the shelf, so during firing there is a temperature gradient between the walls and the base. That difference in temperature translates to stress because it means that different parts of the piece are experiencing different thermal contractions as it cools in the kiln. 90003 90022 An alumina kiln shelf that has cracked during firing 90023 90076 90002 This is due to its inability to withstand thermal gradients across its width. Typical sintered alumina is refractory, but it is not thermal shock resistant like tabular alumina.The inner part of the shelf was being protected from the rising heat because of this heavy, slow-to-rise calcimine vessel on top of it. The moment of the crack was so dramatic that, in spite of the weight on top of it, the shelf blew apart leaving 4 pieces with an inch-gap separating them. 90003 90022 Can you make things from zircopax? Yes. 90023 90081 90002 Only 3% Veegum will plasticize Zircopax (zirconium silicate) enough that you can form anything you want. It is even more responsive to plasticizers than calcined alumina is and it dries very dense and shrinkage is quite low.Zircon is very refractory (has a very high melting temperature) and has low thermal expansion, so it is useful for making many things (the low thermal expansion however does not necessarily mean it can withstand thermal shock well). Of course you will have to have a kiln capable of much higher temperatures than are typical for pottery or porcelain to sinter it well. 90003 90022 Can you throw zircopax on the potters wheel? Yes! 90023 90086 90002 These crucibles are thrown from a mixture of 97% Zircopax (zirconium silicate) and 3% Veegum T.The consistency of the material is good for rolling and making tiles but is not quite plastic enough to throw very thin (so I would try 4% Veegum next time). It takes alot of time to dewater on a plaster bat. But, these are like nothing I could make from any other material. They are incredibly refractory (fired to cone 10 they look like bisqued porcelain). However I have had mixed results for thermal shock resistance. 90003 90022 Does a grog addition improve thermal shock resistance? 90023 Your browser does not support MP4 video.90002 Pyrax (Pyrophillite) is a mineral having a very low thermal expansion. It stands to reason that if we can maximize its percentage in a body and not fire the body to a point that changes the crystal structure, it will be resistant to thermal-shock-resistant cracking. To that end I mixed it with only kaolin (ball clay would add some quartz that would increase thermal expansion) and made slip-cast pieces. I fired them to cone 2 (after finding that by cone 4 shock-resistant properties begin to decline).As you can see from the video, the addition of grog actually harms the performance! The higher the Pyrax, the better. Will this work for kiln shelves? Yes! 90003 90022 Links 90023 90095 90095 90097 90098 90099 Glossary 90100 90101 Dunting 90102 90051 Dunting generally refers to cracking that occurs in ceramic ware as it is cooled in the kiln. The reasons for that cracking can be many. 90052 90105 90106 90098 90099 Glossary 90100 90101 Food Safe 90102 90051 There is an increasing awareness of the food safety of glazes among potters.Be skeptical of claims of food safety from potters who can not explain or demonstrate why. 90052 90105 90106 90098 90099 Glossary 90100 90101 Dishwasher Safe 90102 90051 Dishwasher safety is a concern in ceramic table ware, especially if the ware has been imported or made by a small company or potter. 90052 90105 90106 90098 90099 Glossary 90100 90101 Quartz Inversion 90102 90051 In ceramics, this refers to the sudden volume change in crystalline quartz particles experience as they pass up and down through 573C.Fired cracks are often related to this. 90052 90105 90106 90098 90099 Glossary 90100 90101 Cristobalite Inversion 90102 90051 In ceramics, cristobalite is a form (polymorph) of silica. During firing quartz particles in porcelain can convert to cristobalite. This has implications on the thermal expansion of the fired matrix. 90052 90105 90106 90098 90099 Glossary 90100 90101 Crazing 90102 90051 Crazed ceramic glazes have a network of cracks. Understanding the causes is the most practical way to solve it.95% of the time the solution is to adjust the thermal expansion of the glaze. 90052 90105 90106 90098 90099 Glossary 90100 90101 Vitrification 90102 90051 The term vitrified refers to the fired state of a piece of porcelain or stoneware. Vitrified ware has been fired high enough to make it very strong, hard and dense. 90052 90105 90106 90098 90099 Glossary 90100 90101 Terra cotta 90102 90051 The term Terra Cotta can refer to a process or a kind of clay. Terra cotta clays are high in iron and available almost everywhere.While they vitrify at low temperatures, they are typically fired much lower than that and covered with colorful glazes. 90052 90105 90106 90098 90099 URLs 90100 90101 http://www.astm.org/Standards/C554.htm 90102 90051 ASTM C554 – Thermal Shock Test Method for Crazing Resistance 90052 90105 90106 90098 90099 Tests 90100 90101 Thermal Shock Failure 90105 90106 90098 90099 Tests 90100 90101 300F: Ice Water Crazing Test 90105 90106 90191 90192 90002 By Tony Hansen 90194 90003 90196 90197 90102 Copyright 2008, 2015 року, 2017 https: // digitalfire.com, All Rights Reserved 90192.