Our factory specializes in producing heat resistant glass test tubes with screw caps that come in varying sizes, including 1ml, 2ml, 3ml, 4ml, 5ml, 6ml, 7ml, 8ml, 9ml, 10ml, 15ml, 20ml, 25ml, 30ml, 50ml, 100ml, and 150ml. These test tubes are ideal for a variety of laboratory experiments and research purposes as they are made from high-quality borosilicate glass, which can withstand extreme temperatures ranging from -20°C to 150°C. The screw caps provide an airtight seal, ensuring that the contents of the test tube remain uncontaminated and safe for experimentation. Our products are made to strict quality standards, ensuring that our customers have access to reliable and durable lab equipment.