TEST TUBE BOROSILICATE GLASS Brand: Lablink Features: 100% GENUINE BOROSILICATE GLASS BEAKERS Transparent GUARANTEED BOOKING FOR SHIPPING ON AMAZON WITHIN 24 HR. FROM THE ORDER GENERATE. Borosilicate Glass Part Number: BSS-604 Details: GENUINE BOROSILICATE GLASS TEST TUBES having very low coefficients of thermal expansion & resistant to thermal shock. Product having high tensile strength, long lasting, glossy smooth surface and precise design etc.