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The default shipping fee is high, please contact customer service to adjust the shipping fee according to the actual delivery address. All products in our store can be customized and processed, with discounts available as appropriate. The listed prices, logistics, shipping costs, and attributes are for reference only.Prices are subject to change based on market prices or inventory levels, and we will do our best to provide you with a satisfactory response. High borosilicate glass, also known as hard glass, is made by utilizing the conductive properties of glass at high temperatures. It is achieved by heating the glass internally to melt it, and is processed using advanced manufacturing techniques. Due to its thermal expansion coefficient of 3.3 ± 0.110-6/K, some people also call it borosilicate glass 3.3. It is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance, and high chemical stability. Due to its excellent properties, it is widely used in solar energy, chemical industry, pharmaceutical packaging, electric lighting, and craft decoration industries.