Corning Serological Pipet Stripette 25 ml PS Pack of 25 Pipettes

Corning Stripette Disposable Serological Pipet – 25 mL, Polystyrene, Red Magnifying Stripe, Bulk Packed, Sterile (MPN: 4250)

The Corning 4250 (also cataloged as CLS4250) is a premium, laboratory-grade disposable serological pipet engineered for large-scale sterile fluid transfers, high-throughput screening (HTS), and routine cell culture workflows. Molded from high-purity, optically clear virgin polystyrene, this 25 mL pipet features bidirectional graduation lines and a negative graduation capacity extending up to 10 mL for added volumetric versatility. Designed with a distinct red color-coded magnifying stripe for enhanced meniscus visualization, it incorporates an exclusive anti-drip round tip layout that ensures consistent fluid dispensing accuracy within plus or minus 2 percent at full volume. These pipets come plugged with a high-retention cotton filter matrix and are bulk packed to maximize processing efficiency on high-volume liquid handling lines.

Technical Performance and Design

• Red Meniscus Magnifying Stripe: Features a permanent, high-contrast red longitudinal alignment stripe that visually magnifies the fluid meniscus line. This specialized optical tracking design reduces eye fatigue and ensures fast, mistake-free volume level checks under complex laboratory lighting.

• High-Recovery Anti-Drip Tip: Outfitted with a precision-molded anti-drip round tip profile that increases surface tension retention at the nozzle apex. This geometry minimizes accidental dripping hazards and secures clean, complete sample delivery.

• Bidirectional and Negative Graduations: Imprinted with high-contrast bidirectional graduation marks showing both ascending and descending fluid scales. The upper column layout provides up to 10 mL of negative volumetric space, letting technicians aspirate extra fluid without swapping pipet sizes.

• Ultrasonically Welded Construction: Fabricated with advanced one-piece structural welding protocols at both the tip and mouthpiece interfaces. This joint architecture eliminates interior fluid hang-up seams and minimizes structural shear stress on delicate cellular matrices.

Product Specifications

• Catalog Number / MPN: 4250 (Cross-listed as CLS4250 / 4250-CL)

• Manufacturer / Brand: Corning Life Sciences / Stripette

• Volumetric Capacity: 25 mL (Total operational ceiling including negative space: 35 mL)

• Graduation Intervals: 0.2 mL subdivisions (Calibrated to deliver TD at 20 C with blowout)

• Negative Graduation Volume: 10 mL bonus capacity

• Material Composition: Optically Clear Virgin Polystyrene (PS)

• Filter Matrix Configuration: Cotton Plugged (High-retention fibrous safety barrier)

• Sterility Status: Gamma Irradiated Sterile (Certified Non-Pyrogenic, Non-Cytotoxic, and DNase/RNase-Free)

• Packaging Configuration: Bulk Packed (25 pipets per zip-seal bag, 200 pipets per master case)

Key Benefits and Applications

• High-Volume Cell Culture Feeding: The industry-standard tool for aspirating, measuring, and exchanging massive amounts of cell culture media, serum matrices, and washing buffers within large roller bottles or expansion flasks.

• Automated and Manual Pipetting Alignment: Precision-sized mouthpiece dimensions conform to universal specifications, establishing an airtight, secure fitment with automated motorized pipet controller guns and manual safety bulbs.

• Eco-Forward Bulk Processing: Packaged as 25 pipets loosely nested inside a single bag, this bulk layout removes the tedious overhead of peeling individual wrappers while slashing single-use plastic package waste fields by over 80 percent.

• Pristine Downstream Cleanliness: Certified entirely free of detectable human DNA, pyrogens, and nucleases, making them safe for sensitive biopharmaceutical manufacturing, pilot scale extractions, and downstream PCR target runs.

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