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4.8 out of 5
95.38% of customers are satisfied
5.0 out of 5 stars its clay
Gay Head cliffs in Martha's Vineyard consist almost entirely of clay.Clay is a finely-grained natural rock or soil material that combines one or more clay minerals with possible traces of quartz (SiO2), metal oxides (Al2O3 , MgO etc.) and organic matter. Clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to particle size and geometry as well as water content, and become hard, brittle and non-plastic upon drying or firing.[1][2][3] Depending on the soil's content in which it is found, clay can appear in various colours from white to dull grey or brown to deep orange-red.Electron microscope photograph of smectite clay – magnification 23,500×Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size and mineralogy. Silts, which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. There is, however, some overlap in particle size and other physical properties. The distinction between silt and clay varies by discipline. Geologists and soil scientists usually consider the separation to occur at a particle size of 2 µm (clays being finer than silts), sedimentologists often use 4–5 μm, and colloid chemists use 1 μm.[1] Geotechnical engineers distinguish between silts and clays based on the plasticity properties of the soil, as measured by the soils' Atterberg limits. ISO 14688 grades clay particles as being smaller than 2 μm and silt particles as being larger.Mixtures of sand, silt and less than 40% clay are called loam. Loam makes good soil and is used as a building material.FormationDeforestation for clay extraction in Rio de Janeiro, Brazil. The picture is of Morro da Covanca, Jacarepaguá.Clay minerals typically form over long periods of time as a result of the gradual chemical weathering of rocks, usually silicate-bearing, by low concentrations of carbonic acid and other diluted solvents. These solvents, usually acidic, migrate through the weathering rock after leaching through upper weathered layers. In addition to the weathering process, some clay minerals are formed through hydrothermal activity. There are two types of clay deposits: primary and secondary. Primary clays form as residual deposits in soil and remain at the site of formation. Secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit.[4] Clay deposits are typically associated with very low energy depositional environments such as big lakes and marine basins.GroupingDepending on the academic source, there are three or four main groups of clays: kaolinite, montmorillonite-smectite, illite, and chlorite. Chlorites are not always considered to be a clay, sometimes being classified as a separate group within the phyllosilicates. There are approximately 30 different types of "pure" clays in these categories, but most "natural" clay deposits are mixtures of these different types, along with other weathered minerals.Varve (or varved clay) is clay with visible annual layers, which are formed by seasonal deposition of those layers and are marked by differences in erosion and organic content. This type of deposit is common in former glacial lakes. When fine sediments are delivered into the calm waters of these glacial lake basins away from the shoreline, they settle to the lake bed. The resulting seasonal layering is preserved in an even distribution of clay sediment banding.[4]Quick clay is a unique type of marine clay indigenous to the glaciated terrains of Norway, Canada, Northern Ireland, and Sweden. It is a highly sensitive clay, prone to liquefaction, which has been involved in several deadly landslides.Historical and modern usesClay layers in a construction site. Dry clay is normally much more stable than sand with regard to excavations.Clay used to form tiles and other ceramic products.Bottle stopper made of clay, 14th centuryClays exhibit plasticity when mixed with water in certain proportions. However, when dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes occur. These changes convert the clay into a ceramic material. Because of these properties, clay is used for making pottery, both utilitarian and decorative, and construction products, such as bricks, wall and floor tiles. Different types of clay, when used with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain. Prehistoric humans discovered the useful properties of clay. Some of the earliest pottery shards recovered are from central Honshu, Japan. They are associated with the Jōmon culture and deposits they were recovered from have been dated to around 14,000 BC.[6]Clay tablets were the first known writing medium.[7] Scribes wrote by inscribing them with cuneiform script using a blunt reed called a stylus. Purpose-made clay balls were also used as sling ammunition.Clays sintered in fire were the first form of ceramic. Bricks, cooking pots, art objects, dishware, smoking pipes, and even musical instruments such as the ocarina can all be shaped from clay before being fired. Clay is also used in many industrial processes, such as paper making, cement production, and chemical filtering. Until the late 20th century, bentonite clay was widely used as a mold binder in the manufacture of sand castings.Clay, being relatively impermeable to water, is also used where natural seals are needed, such as in the cores of dams, or as a barrier in landfills against toxic seepage (lining the landfill, preferably in combination with geotextiles).[8] (See puddling.)Studies in the early 21st century have investigated clay's absorption capacities in various applications, such as the removal of heavy metals from waste water and air purification.[9][10]Medical useTraditional uses of clay as medicine go back to prehistoric times. An example is Armenian bole, which is used to soothe an upset stomach. Some animals such as parrots and pigs ingest clay for similar reasons.[11] Kaolin clay and attapulgite have been used as anti-diarrheal medicines.As a building materialClay as the defining ingredient of loam is one of the oldest building materials on Earth, among other ancient, naturally-occurring geologic materials such as stone and organic materials like wood.[12] Between one-half and two-thirds of the world's population, in both traditional societies as well as developed countries, still live or work in buildings made with clay, often baked into brick, as an essential part of its load-bearing structure. Also a primary ingredient in many natural building techniques, clay is used to create adobe, cob, cordwood, and rammed earth structures and building elements such as wattle and daub, clay plaster, clay render case, clay floors and clay paints and ceramic building material. Clay was used as a mortar in brick chimneys and stone walls where protected from water.
5.0 out of 5 stars Good quality
Lots of good quality clay in this pack. I was worried we’d run out, as I left a cover activity for my class to make clay snakes, but there was plenty. It dried quickly and was easy to paint after.
4.0 out of 5 stars Its okay
Its good clay i used it to make pinch pots and small things. Although when it arrived it was split at the bottom so abit of the clay was dry.
5.0 out of 5 stars Potty for clay!
I have just bought myself a mini potter’s wheel and wasn’t sure what clay to use with it so I got this. I do pottery at a class but I haven’t got a kiln at home so air dry seemed the way forward.It works amazingly well and now wish I could get it in bigger bags! I made the little vase and when it had dried I coloured it with a rose gold chrome pen and it looks amazing! So glad I got this clay, it is so nice to work with!
5.0 out of 5 stars Price and delivery good
Haven't used it yet, but price and quality good.
5.0 out of 5 stars Great Air dry clay
This is a great air dry clay. Comparing it to Das - it has a smoother finish. So for example when you have rolled out both types of clay and you are cutting with a blade - with Das you get a bit of drag down the sides - with this clay, you get a super smooth cut that needs no tidying up. As anyone knows when you work with 'any' air dry clay you need water! But I found with this clay for rolling out and using with cutters, perfectly smooth finish. but more importantly for me, it was smoother to use on an armature for figure work. Saying that it is a very slightly firmer clay to Das so the figure work took a bit more effort to get the shape you wanted - but if the right sized amounts are used for adding to an armature, this wasn't generally a problem. Ie I found when trying to add smaller pieces and blending, it was harder to smooth one piece on to the next. Das is easier in this context. So for flat rolled out clay work where sharper edges and finishes are required - ie if using cutters? I would go for this clay. If you want to have a softer clay that spreads and can be manipulated more easily then Das maybe better. This clay needed less sanding than Das when dried too. Making slip with this clay is fine. Like all ADC it will crack unless dried properly ie with a damp cover and turned on occasion. I would def buy again and am now just going to attempt a wall hanging pot to see how it holds up to that.
3.0 out of 5 stars A Decent Product with Some Caveats
I recently purchased this product, and while it has its merits, there are a few important considerations to keep in mind.The clay, when wet, is easy to work with and mold into various shapes and designs. It's pliable and great for creative projects. However, once it dries, it has a tendency to shrink and may develop cracks, which can be a bit frustrating. The extent of shrinking and cracking seems to be more noticeable when working with larger or thicker pieces, so be prepared for that.Another important point to note is the drying time. While the product claims a fast drying time, in reality, it varies significantly depending on the thickness of the material you're working with. Thicker pieces can take well over 24 hours to dry completely. So, if you're in a hurry to finish your project, you might want to consider a different product with a quicker drying time.In summary, this product is decent for creative projects, but you need to be prepared for the possibility of shrinking and cracking during the drying process. Also, keep in mind that drying times can be longer than advertised, especially for thicker pieces. If you're patient and plan accordingly, it can still be a useful addition to your art supplies.
5.0 out of 5 stars Excellent texture
I bought this clay to compare with no natural clay and to see its ability to take the texture from my intrincate texture plates and rolling pins. Also to eliminate the disturbing odour factor in my environment. Beautiful product to work with and it's an absolute breeze to clean the work surfaces. My samples are thin pieces, so the clay dries quite fast after finished and that allows me to make many samples in a blink of an eye. No doubt it was the best choice I've made. Excellent product.
Perfect for beginners
Came quicker than expected perfectly intact. Clay is perfect for beginners, drys really quickly so make sure to have a spray bottle if you want to keep it sculptable.
klei
prima
Très pratique
Très bien pour les enfants, ça les enlève du portable, la terre se travaille très bien, et sèche sans casser !
Super bien
Muy buena arcilla para hacer cositas en casa, se moldea muy bien, se seca muy rapido y el color una vez seco se ve muy bien
Top
Comme je l’imaginais, facile à pétrir
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Pebeo Gedeo Air Drying Clay, Natural,White,1.5 Kg
BHD10600
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Product origin: United Kingdom
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