Nowadays, the types and applicability of glass products are becoming increasingly wide, and some glass products can be directly used as cooking utensils. However, due to some customers' lack of understanding of the detailed materials and application scope of glass products, they mistakenly purchased and used them, resulting in some incidents of glass products bursting and injuring people.

The glassware that customers often come into contact with in their home life now mainly includes three categories: regular glass, tempered glass, and heat-resistant glass. Generally, glass cannot be used in high-temperature heating environments such as ovens and microwaves; Tempered glass is an improved product that enhances the mechanical impact resistance of ordinary soda lime glass through tempering treatment, but its heat shock resistance improvement is limited; Heat resistant glass mostly belongs to the borosilicate glass series, including varieties such as microcrystalline glass. Due to different chemical compositions, its structure is also different from general glass or tempered glass. Borosilicate glass has a small coefficient of thermal expansion and has good resistance to high temperatures and rapid temperature changes. It is suitable for use as a food processing container in the kitchen and can be directly placed in microwave ovens and ovens.

The heat-resistant glass products for kitchen use mainly include heat-resistant tableware, heat-resistant fresh-keeping containers, and cooking utensils, which can be divided into two uses: open flame and dark flame. Heat resistant glass with ultra-low coefficient of expansion, such as microcrystalline glass, has a thermal shock strength of over 400 ℃ and is primarily used for direct open flame heating, cooking, and withstanding rapid heating and cooling; Dark fire glass products, with a thermal shock strength of over 120 ℃, are primarily used in non direct open flame heating and cooking environments such as ovens and microwaves. They are also the most common heat-resistant glass products on the market, such as borosilicate glass.

But now the labeling of glass products in the market is not clear, and some operators intentionally confuse concepts, expanding the functionality of general tempered glass and even general glass. Therefore, the Chinese Customer Association reminds customers to pay attention to:

1. General glass cannot be used for heating and cooking environments, such as in ovens and microwaves. Unhomogenized tempered glass may pose a risk of self explosion and injury when used in ovens and microwaves (now "homogenized" tempered glass is mainly used for industrial purposes, such as automotive glass, building doors and windows, furniture accessories, etc.).

Currently, there are no so-called heat-resistant tempered glass products or tempered heat-resistant glass products in the domestic market. Customers should not be misled when making purchases.

3. Heat resistant glass products should have corresponding labels indicating the operating temperature, operating range, etc. Nowadays, borosilicate glass is the majority of heat-resistant glass, while microcrystalline glass has the best heat-resistant function.

4. Heat resistant glass products are obtained by annealing and cooling, with good thermal stability, high temperature resistance, high production difficulty, and high manufacturing costs. If customers find that the nominal heat-resistant glass is a product with a very low price when making a purchase, they should consider its authenticity.

Article source: Tempered glass coverwww.yinghuade.com