Specification AgeRangeDescription : adult Brand : WENWENLEE BulletPoint1 : Name: Standard glass test tube BulletPoint2 : Capacity: 1.75 ml Diameter: 5 mm BulletPoint3 : Technology: Adhesive technology (style01) BulletPoint4 : Sintering technology (style02) BulletPoint5 : Material: optical glass Color : One Color ExternallyAssignedProductIdentifier1 : 8030317322283 ExternallyAssignedProductIdentifier2 : 7460317145864 ItemName : WENWENLEE 1 PCS Standard Glass Test Tube, with Cover and Bottom (5mm)(Frit sintering) ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 3 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-test-tubes Manufacturer : JTSF ModelName : JTSF9648 ModelNumber : JTSF9648 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : JTSF9648 ProductDescription : Transmittance: >80% (tested in pairs) Wavelength: 350nm-2000nm Dimensions: 12.5 x 7.5 x 45mm Adhesive bonding process This product is made of multiple pieces of glass bonded together with special glue. It is not resistant to high temperatures, acids and alkalis, and is cheap. Agglomeration Technology It uses glass powder high temperature melting technology to weld multiple pieces of glass together. It can withstand high temperatures of 600 degrees Celsius and is resistant to acids and alkalis. Material Introduction Optical glass has excellent mechanical properties. Low bubble impurity content, good scratch resistance, suitable for optoelectronics Microwave technology and diffractive optical elements. Due to its stable chemical properties and resistance to hydrolysis, acid and alkali, no special treatment such as polishing is required. Main parameters of optical glass Density: 2.55 g/cm3 Specific heat: 879 joules/kg. Dispersion: 0.00806 Refractive index: 1.5230 Abbe number: 58.3 Thermal expansion coefficient: 9.4×10e/K Material spectrum curve (B270)