LABORATORY GRADE || Free of heavy metals. GREAT FOR LABORATORIES, CLASSROOMS & HOUSEHOLD || Designed for use in laboratories, classrooms, or the home. Count: 12 Narrow-mouth reagent bottles constructed of high-density polyethylene (HDPE) for exceptional pliability and strength. STATE OF THE ART MANUFACTURING || Precision molded for consistent wall thickness and smooth interior and exterior surfaces Reagent Bottle United Scientific® - Sample Containers With Lids - Amber HDPE Wide Mouth - Chemical Container - 16 Oz Bottles (500mL) Multi-Purpose Plastic Bottles With Lids, Pack Of 12 Hdpe Bottles Height: 170mm, Neck I.D. United Scientific 500 ml Reagent Bottles, Narrow Mouth, HDPE, Amber... The amber color reduces UV light transmission to protect light-sensitive contents. SUSTAINABILITY || Safe, break resistant alternative to glass bottles. Resuable. 21mm, Cap Size: 28-415 Reagent Bottles-labtech scientific Manufactured from USP Class VI resin that is FDA -21CFR compliant for food contact A clear gloss medium with acrylic polymers that enable the artists to adjust their acrylic paint viscosity to create amazing poured sheets, puddles, cells, and smooth-flowing applications of color Amber Bottles | Protect light-sensitive materials during shipping and storage. Excellent chemical resistance to most acids, bases, and alcohols.