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PYREX Narrow Mouth Erlenmeyer Flask Made from Type 1, Class A low expansion borosilicate glass, PYREX scientific glassware has become the accepted standard in chemistry labs across the globe. This glass chemistry flask is manufactured with a cylindrical neck, conical body and flat bottom, along with a uniform wall thickness to make it ideal for heating by hot plate, flame, oven, microwave or heating mantles. The laboratory flask’s construction offers optimum balance between thermal shock resistance and mechanical strength, and in normal service it can be heated many times to 230°C and cooled to -230°C. The borosilicate glass flask is chemically resistant to most acids, alkalis and solvents, and the heavy-duty rim reduces cracking or chipping. The ideal chemical and heat resistant chemistry glassware for use in laboratories or for home or classroom science experiments, this range of PYREX low expansion borosilicate glass flasks is available in sizes from 50mL - 1L capacity. The lab glass flasks have approximate graduations marked in durable white enamel, and an extra-large marking spot. These scientific flasks are easy to clean or sterilize in autoclaves up to 121°C at 15 psi for 15 minutes. PYREX scientific glassware - trusted by scientists for 100 years Exceptional strength and stability. Brilliant transparency. Superior resistance to chemicals, contaminants, and drastic changes in temperature. These are among the key properties that enable PYREX glass to endure even the toughest laboratory environments, making it the indispensable partner for chemists and research scientists for more than 100 years.

Approximate graduations are in durable white enamel. An extra large marking space is also provided. Heavy, durable top tooling.A convenience pack containing one each of the most popular sizes of Cat. No. 4980 series flask. Designed for the low volume user, a case contains one each of five sizes: 50 mL, 125 mL, 250 mL, 500 mL, and 1L. Packaged in a partitioned carton for safe transit and storage. Product Number 4980-PACK Qty./Pk 1 / Pk Qty./Cs 6 / Cs Brand PYREX Top Style Heavy duty rim Neck Style Narrow mouth Stopper Style No stopper Feature Reusable Flask Style Erlenmeyer Sterile No Packaging Assortment Pack