VWR® Laboratory Bottles (Narrow Neck) are manufactured from borosilicate 3.3 glass and conform to DIN ISO 4796 standards. Available in clear and amber glass, with a GL 45 DIN thread for compatibility with standard bottle-top dispensers, closures, and filter funnels. Features include: graduated scale for volume reading, blue PP screw cap, pouring ring, and high chemical resistance. Amber variants protect light-sensitive reagents and solvents. The narrow-neck design is ideal for storage and dispensing of liquid reagents, buffers, culture media, and solvents. Available from 50 mL to 20 L. Also available in square format for space-efficient storage in refrigerators and shelving. Supplied in shrink-wrapped packs.