Lock & Lock Boroseal Heat Resistant Glass Rectangle 1000ml-HLLG445

• Lock & Lock Containers Are Guaranteed Leak-Proof
• This Assures Food To Stay Fresh Longer And Keeps Contents In Containers Secure
• Heat Resistant Glass
• Safe Enough For Storing And Cooking Without The Risk Of Spontaneous Breaking & Shattering
• Safe To Use In The Oven (Without Lid), Microwave, Freezer And Dishwasher.

Heat-resistant glass and normal glasses are different. Difference in Raw Material - Unlike other glasses, heat-resistant glass use material that contains strong heat resistant properties which could withstand sudden change in temperature. Difference in Manufacturing Process - Heat-resistant glass is produced in temperature above 2700°F which makes it harder to manufacture. And it contains borosilicate which makes it capable of withstanding sudden change in temperature, but the costs are very high.