Catalog Number - 97040-80C

Provide robust sealing and superior chemical resistance with screw top caps designed for demanding EPA testing and storage workflows. Constructed from knurled polypropylene, these caps offer secure handling and consistent torque application during both manual and automated processes. The butyl rubber / PTFE septa combination is specifically chosen for its enhanced barrier properties and compatibility with a wide range of analytes.

97040-80C caps feature EPA quality septa with a 55 Shore A hardness and a thickness of 2.5 mm, providing a firm yet flexible sealing interface for both autosampler injection and long‑term storage. The 12.5 mm center hole allows precise and repeatable needle penetration, while the butyl rubber layer offers excellent gas and moisture barrier performance. The PTFE layer ensures chemical inertness, helping minimize analyte interaction during sampling and storage.

These caps are compatible with 30 mL, 40 mL, and 60 mL EPA style vials using ND24 (24‑400) threads, making them a versatile option for laboratories requiring reliable sealing, improved barrier properties, and consistent autosampler performance.

Key Benefits

• Butyl rubber provides superior gas and vapor barrier properties

• PTFE layer ensures chemical resistance and inertness

• 2.5 mm thick septa enhances sealing strength and durability

• 55 Shore A hardness offers firm, reliable sealing performance

• 12.5 mm opening allows consistent autosampler needle access

• Knurled cap design improves grip and usability

• Compatible with multiple EPA vial sizes (30, 40, 60 mL)

Typical Applications

• EPA and environmental testing

• GC, LC‑MS, and HPLC sample workflows

• Volatile and sensitive sample storage

• Autosampler injection applications

• Laboratory storage and transport

Specifications

• Cap Type: Screw Top

• Thread Size: ND24 (24‑400)

• Cap Material: Polypropylene (knurled, white)

• Septa: Red butyl rubber / grey PTFE

• Septa Thickness: 2.5 mm

• Hardness: 55 Shore A

• Opening Size: 12.5 mm center hole

• Packaging: Bulk (Custom Item)

Compatibility

• Designed for ND24 (24‑400) EPA style vials

• Compatible with 30 mL, 40 mL, and 60 mL EPA vials

• Suitable for autosampler and storage applications

Performance and Design Notes

• Butyl rubber enhances sealing for volatile compounds

• PTFE layer minimizes analyte interaction

• Septa supports repeated needle penetration

• Designed for high‑reliability EPA testing environments

Important Notes

• Custom item with bulk pricing available

• Suitable for both autosampler use and long‑term storage

• Ideal for applications requiring enhanced vapor barrier protection

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Custom Item Pricing Information

• Please contact Customer Service for formal quotation, lead time, and ordering assistance.

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