One piece table top Buchner funnels with a lower side outlet for vacuum connection. •Porcelain labware is widely used in the chemistry laboratory It has excellent resistance to all reagents except hydrofluoric acid, and is highly resistant to thermal shock while having a very low coefficient of expansion Note: Follow gradual heating/cooling rates. Avoid contact of heated ware with a cold surface. Use an oven or hot plate and an intermediate step when quicker heating/cooling rates are required. Carefully inspect labware prior to each use and do not use any product that appears defective. The average coefficient of expansion from 20° to 200°C is 3.56 x 10-5 gradually increasing to 4.69 x 10-5 at 1000°C. To prevent thermal stress cracks on porcelain ware do not exceed a heating/cooling rate of 200°C per hour.