250ml PFA Volumetric Flask

This 250ml PFA volumetric flask from Nanjing Binzhenghong Instrument Co, Ltd. is manufactured from virgin perfluoroalkoxy fluoropolymer and conforms to Class A tolerances under DIN EN ISO 1042. The material offers high optical transparency compared with conventional PTFE alternatives, facilitating meniscus reading during precise liquid measurement. Unlike glass volumetricware, the PFA construction eliminates risk of thermal or mechanical fracture and removes metal ion contamination that can interfere with trace elemental analysis. The flask incorporates a screw cap closure rather than a ground-glass stopper, which the supplier identifies as a design feature that lowers contamination risk in sensitive applications. Class A compliance implies a tight manufacturing tolerance on the nominal volume, though buyers should request the specific permissible error at 250ml.

Virgin PFA was selected for its superior cleanability relative to glass, PTFE and polypropylene, an important consideration in ICP-MS and other techniques where picogram-level carryover must be controlled. The surface energy of PFA is low, so residues from high-ionic-strength or organic matrices release more readily during rinse cycles. The material tolerates heat sterilisation by autoclave, dry heat ovens, or chemical methods such as ethylene oxide or peracetic acid vapour, making the flask suitable for cell culture media preparation and microbiological quality control. The screw thread is moulded integrally with the neck, avoiding the seam lines or insert-moulding defects that can harbour contaminants in less precisely tooled products. Standard PFA characteristics include broad chemical resistance across pH 0-14, compatibility with strong oxidisers such as aqua regia, and negligible moisture absorption.

Principal buyers include pharmaceutical analytical laboratories, environmental testing facilities, semiconductor chemical handling operations, and biotechnology manufacturing sites where USP or EP compliance may be required. The 250ml size is commonly used for preparing intermediate stock solutions prior to dilution to working concentration. Because the listing does not state calibration certificate inclusion, buyers should confirm whether a NIST-traceable or ISO 17025-accredited calibration certificate is available. Sterilisation validation data, extractables testing, and shelf-life stability under gamma irradiation are likewise absent from the source and should be requested if relevant to the intended application.

Nanjing Binzhenghong Instrument Co, Ltd. operates from 301, Building 10, Baijiahui Chuangxin Community, No. 699-18, Xuanwu Avenue, Xuanwu District, Nanjing City, Jiangsu Province, postal code 210000. The supplier's platform trust tier is harbour, and no response rate or average response time data is populated in the system. This absence of engagement metrics means buyers should initiate contact proactively and document all correspondence for their procurement records. No information is provided about the company's founding year, ownership structure, or whether it operates as manufacturer, trader, or hybrid.

The supplier's product focus covers laboratory plasticware, with this listing emphasising PFA volumetric flasks for precise liquid handling in contamination-sensitive analyses. No factory audit reports, ISO 9001 certificate references, export licence numbers, or named OEM clients appear in the source materials. The Class A tolerance claim references DIN EN ISO 1042, yet no certificate or third-party test report is cited. Buyers are encouraged to request a copy of the supplier's quality manual, incoming inspection records for raw PFA resin, and dimensional inspection data for the 250ml flask lot they intend to purchase. The listing does not indicate whether the company maintains in-house calibration capability or subcontracts metrology services.