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About Tianyuan Glass:Huailai Tianyuan Special Type Glass Co.,Ltd. was established on October 9th, 2002,which is the national high technology Enterprise specializes in the research and development, production and sales of colored borosilicate 3.3 glass tubing and rods.The registered capital is 36.8 million yuan, Total assets exceed 450 million yuan. Presently we have more than 8 hundreds employees.Welcome business customer contact us and visit the factory.Features:Material:ISO approved High borosilicate glassBearing temperature: -20℃ to 150 ℃ (-4 ℉ to 302 ℉ )microwave safe!!!!!Capacity:17oz,about 500mlPlease note:1、The cups are handmade, we can't guarantee that the pictures and the locations are exactly the same which is difference from those made by the machine.3、As glass is fragile,if the items you received is broken,please contact us first.4、If broken within half a year(not due to human error),please contact us for new or refund.Compared to ordinary glass, borosilicate glass is superior to the former in terms of thermal properties, optical properties, mechanical properties and chemical properties, and has a lower thermal expansion coefficient than ordinary glass.And also has a high thermal shock and surface hardness whitch can prevent scratches, and can be applied to fire-proof, bullet-proof glass.Some customers receive the product, they will think why it is so thin and light, if the quality is terrible?In fact, normally,borosilicate glass products are thinner than ordinary glass products. This is just its feature, but never mind, it is more resistant to low temperature and high temperature. Kettle and cup products can be taken out from the refrigerator and poured directly into hot boiling water without breaking.Please trust the borosilicate.