Is the purple sand thermos cup good? Purple sand thermos cup is different from ordinary stainless steel thermos cup, which has its own unique advantages. Purple sand thermos cups are very environmentally friendly. Purple sand is a naturally formed mud, not artificially made. Because the purple sand itself has good plasticity, no chemicals will be added when making the purple sand thermos cup, which is very environmentally friendly. Moreover, the purple sand thermos cup will also precipitate some trace elements needed by the human body, which is beneficial to health.
You can see the teapot mug from the outside. It feels a bit like ceramics outside, but it looks much more delicate and darker than ordinary ceramics. The interior of the purple sand thermos cup adopts stainless steel vacuum design, which is also the purpose of keeping boiling water warm, but the exterior of the thermos cup adopts purple sand, which is very textured.
The shape of purple sand thermos cup is relatively simple, generally simple cylindrical, but there are high and low thicknesses. Usually the thermos cups we see are all colorful. Many thermos cups are designed according to adults and children. Generally, thermos cups have different shapes, different colors and patterns, but purple sand thermos cups don't have this, so purple sand thermos cups look too traditional and conservative.
The purple sand thermos cup is characterized by 1 and has good plasticity. Taking purple mud as an example, its liquid limit is 33.4%, plastic limit is 15.9% and index is 17.5%. Its plasticity is very strong and it can be processed into different sizes and shapes at will. Strong adhesion when making, but not sticking to tools or hands. For example, the mouth and handle can be made separately and then glued to the pot body, and can be carved with mud. The mud pieces of square utensils can be bonded with oil sludge (just add more water) and then processed. Such a large technical capacity provides a material guarantee for ceramists to fully express their creative intentions and display their technical skills.
2. The drying shrinkage is small. Zisha pottery shrinks by about 8% from mud blank molding to firing, with wide firing temperature range, small deformation rate and high green strength. Therefore, the teapot lid can be perfectly sewn, and the contour lines are rigorous and not distorted. The handle can be thicker than the porcelain pot, so it is proportional to the mouth because it is not afraid that the mouth of the pot is not round. In addition, it can also be used as an open vessel and a teapot with a big mouth as big as the pot body.
3. Purple mud itself can be made into pottery without adding other raw materials. The finished pottery has double pore structure, one is closed pore, which is the pore inside the aggregate. One is opening, which is a group of pores wrapped around aggregate. This makes purple sand pottery have good air permeability. The fine pores have strong adsorption, but glazed ceramic teapots lack this function.