Borosilicate 3.3 hybex glass Autoclavable caps (GL45) & drip rings Permanent enamel graduation markings Large area for bottle marking/identification Autoclavable, reusable and breakage resistant Five cap colors hybex™ reusable media bottles are manufactured from high quality, borosilicate 3.3 glass. With their superior chemical resistance, these bottles are ideal for storage of reagents, culture media, biological fluids and a variety of other aqueous and non-aqueous solutions. A low coefficient of thermal expansion (3.3), provides temperature resistance that is far superior to that of standard lab glass (or soda lime glass). Hybex glass can withstand temperatures from -70 to 500°C, permitting repeated use in freezers, microwaves, autoclaves and dry heat sterilization chambers. All hybex bottles have permanent, white enamel graduations for volume measurement and a white identification box for marking or coding. All hybex media bottles include a drip-free sealing ring as we