Lock&Lock Glass is made of “heat-resistant glass,” which is safe at high temperature. That's why Lock&Lock Glass is strong enough to withstand heat and can be used in microwave ranges and ovens.

< Advantages of heat-resistant glass>

- The difference lies in the raw material.

: Unlike the ordinary carbonate of lime glass, the product is borosilicate glass containing a special heat-resistant composite of borosilicate; it is safe even with sharp temperature changes.

- Production procedures differ.

  : Heat-resistant glass exhibits plasticity at temperatures higher than 200~300°C; made of raw materials including borosilicate, it is very strong against heat shocks due to rapid heating/cooling. The production cost is 2~3 times that of ordinary glass.