... Borosilicate, it is used in lever gauge in boiler for water position. The category is as follows:1) Three tendons (four ... ,and with its self tine green is allowed.3. Water-resistanceCooked in the water for 5 hours, then weigh up, then titration ... under the temperature of 260±1, then, put into the water of 20±1,it should not crack6. Bend-resistance≥80MPa ...