GL45 threaded cap with a drip-free pouring ring Max temperature of 140 degrees Celsius (284 degrees Fahrenheit) borosilicate glass content: B2O3 about 12%-13% ; SiO2 over 80% 1. good thermal resistance 2. excellent chemical durability 3. high light transmission 4. high-quality pristine surface Item Weight :1.55 pounds Package Dimensions: 9.65 x