This GSO standard specifies a thermal shock test and the procedure for determining the thermal shock endurance for laboratory glassware in the condition received by the customer. This GSO standard does not apply to fused silica ware and annealed containers made from soda-lime-silicate glass. Annealed containers made from soda-lime-silicate glass shall be tested according to GSO standard which will be approved by GSO concerned with Glass containers – Thermal shock resistance and thermal shock endurance – Test methods” (1) .