PYREX® VISTA™ 250mL Class B Volumetric Flask with Polyethylene Snap Cap – 70581-250

The PYREX® VISTA™ 250mL Class B Volumetric Flask is a durable laboratory glass instrument designed for preparing standard solutions, sample dilution, chemical analysis, and routine volumetric measurements. Manufactured by Corning, the flask features a long neck with a permanent calibration line, a stable flat-bottom design, and a blue polyethylene snap cap for convenient closure. Its Class B accuracy makes it suitable for routine laboratory applications where Class A precision is not required. Ideal for pharmaceutical laboratories, diagnostic laboratories, chemical testing facilities, research institutions, educational laboratories, and quality control departments. Key Features & Specifications - 250mL Capacity: Suitable for preparing laboratory solutions to a defined final volume. - Class B Accuracy: Capacity tolerances are twice those specified for equivalent Class A volumetric glassware. - Volumetric Calibration: Features a single permanent calibration line for fixed-volume measurement. - Laboratory Glass Construction: Transparent and reusable glass body. - Polyethylene Snap Cap: Supplied with a blue low-density polyethylene (LDPE) closure. - No. 250 Snap Cap: Heavy-duty neck designed for the manufacturer's No. 250 snap cap. - Replacement Caps: Compatible replacement closures available in Corning's 7666 series. - Long Neck Design: Facilitates careful adjustment of the liquid meniscus to the calibration mark. - Blue Marking Area: Provides space for laboratory identification and labelling. - Flat Bottom: Allows stable upright positioning on laboratory benches. - Reusable Construction: Suitable for repeated laboratory procedures with proper cleaning. - Non-Sterile: Supplied without sterilization. - Manufacturer Packaging: Six flasks per pack and twelve flasks per case. Specification Details Brand PYREX® VISTA™ Manufacturer Corning Product Number 70581-250 Previous Catalogue Number 5581-250 Supplier Reference 401491 Product Type Volumetric Laboratory Flask Capacity 250mL Accuracy Classification Class B Accuracy Tolerance Twice the equivalent Class A tolerance Flask Material Laboratory Glass Flask Shape Volumetric Bottom Style Flat Bottom Neck Style Long Neck Graduation Single Permanent Calibration Line Marking Colour Blue Cap Type Snap Cap Cap Material Low-Density Polyethylene (LDPE) Cap Colour Blue Snap Cap Number 250 Replacement Cap Series Corning 7666 Snap Cap Included Yes Glass Stopper Included No Sterility Non-Sterile Reusable Yes Quantity per Pack 6 Pieces Quantity per Case 12 Pieces Applications Solution Preparation, Sample Dilution, Chemical Analysis, Laboratory Testing