FLEXSEAL® H2 Spiral Wound Gasket for 1 Inch ASME B16.5 Class 3-4-600 Flange, 316L Stainless Steel Winding, ePTFE/FG Filler, 316L Stainless Steel Outer Ring 316L Stainless Steel Inner Ring Domestic USA Manufactured

INPH0303590301003
FLEXSEAL® H2 Spiral Wound Gasket for 1 Inch ASME B16.5 Class 3-4-600 Flange, 316L Stainless Steel Winding, ePTFE/FG Filler, 316L Stainless Steel Outer Ring 316L Stainless Steel Inner Ring Domestic USA Manufactured
  • Shipping Weight: 0 lbs
  • Style/Model: FLEXSEAL H2®
  • Nominal Pipe Size Fraction (Inch): 1
  • Pipe Standard and Class: ASME B16.5 Class 3-4-600
  • Inner Ring Material: 316L Stainless Steel
  • Winding Material: 316L Stainless Steel
  • Filler Material: ePTFE/FG
  • Outer Ring Material: 316L Stainless Steel
  • Compliances/Standards: Domestic USA Manufactured, Fire Safe, REACH Compliant, RoHS Compliant
  • Color Coding: green with stripe
  • Compliances: REACH Compliant, RoHS Compliant, Domestic USA Manufactured, Fire Safe
  • Flange Standards/Pressure Class: ASME B16.5 Class 3-4-600
  • Gasket Standard: ASME B16.20
  • Inner Ring Included: Yes
  • Inside Diameter Inner Ring (mm): 26.92
  • Inside Diameter Seal (mm): 31.75
  • Max Temperature (C): 454
  • Max Temperature (F): 850
  • Min Temperature (C): -100
  • Min Temperature (F): -150
  • Nominal Pipe Size (inch): 1.000
  • Nominal Pipe Size DN (mm): 25.0
  • Outer Diameter Outer Ring (mm): 73.15
  • Outer Diameter Seal (mm): 47.75
  • Pressure Class: 3-4-600
  • Thickness Compressed (inch): 0.125
  • Thickness Compressed (mm): 3.18
  • Thickness Uncompressed (inch): 0.175
  • Thickness Uncompressed (mm): 4.45
  • UPC Code: 191074268080
  • Primary Dimensional Unit of Measure: Imperial
  • Inside Diameter (Inch): 1.060
  • Inside Diameter (mm): 26.92
  • Outside Diameter (inch): 2.880
  • Outside Diameter (mm): 73.15

Garlock’s FLEXSEAL® H2 is a metal spiral wound gasket with dual sealing elements, engineered to deliver exceptional purity and fire-safe performance in the most demanding gas applications. Designed for gaseous or liquid hydrogen, and oxygen service, as well as chemicals within supporting systems, the FLEXSEAL® H2 provides reliable performance in high pressure, flammable, and extreme temperature service conditions—ideal for use in production, processing, and distribution systems that must comply with ASME B31.12 and ASME B16.20. Additionally, this gasket is cleaned and packaged for oxygen service to ensure the highest level of purity.

FLEXSEAL® H2 features a unique dual-seal design that sets it apart from conventional spiral wound gaskets. The primary inner PTFE filler wraps deliver outstanding sealability, high purity, and chemical resistance, while the secondary outer flexible graphite wraps act as a fire-safe barrier in the event of a fire or sudden temperature spike. The stainless-steel outer guide ring ensures proper alignment and flange stability, while the inner ring guards against radial buckling in high compressive load / high-pressure service. Available with a variety of metal alloys, FLEXSEAL® H2 is built to perform in demanding hydrogen, industrial gas and chemical services.

  • Overview

Features and Benefits:

  • Cleaned and packaged for oxygen service to ensure no organic contaminants are introduced into the system.
  • Achieve both high purity and fire-safe performance with dual sealing elements made of PTFE and graphite.
  • Primary PTFE filler wraps provide superior chemical resistance, and optimal sealability for gas or liquid service.
  • Secondary flexible graphite filler wraps provide seal and system integrity in the event of a facility fire or unplanned system temperature excursion.
  • Successfully passed API 6FB fire testing, which is widely regarded as the industry benchmark for fire-safe performance.
  • Ensures long-term durability under high pressures and temperatures with spiral wound metal construction.
  • Standard configuration comes with an inner ring that prevents winding damage due to radial buckling.
  • Meets hydrogen and oxygen service standards with ASME B31.12-compliant design.
  • Stainless steel outer ring provides reliable flange alignment and sealing element positioning in standard flanges.

Media Use:

  • Hydrogen (gas or liquid)
  • Oxygen
  • Strong caustics such as potassium hydroxide
  • Ultrapure water
  • Steams or gases up to 400F
  • Hydrocarbons
  • Refrigerants
  • Strong cids
  • Ammonia
  • Liquefied natural gas (LNG) and Methane

Industries Served:

  • Chemical Processing
  • Power Generation
  • Nuclear