Ansi-Flex 150# ANSI Flange Gasket

CLEAR Solutions supplies the Rubber Fab Ansi-Flex 150# ANSI flange gasket for sanitary and industrial process systems that need a PTFE-faced gasket with the recovery and memory of an elastomer. This ANSI flange gasket features a PTFE contact surface unitized to an EPDM rubber inner core, combining clean product contact with a more resilient seal than standard PTFE-only flange gaskets.

The totally bonded construction helps the gasket maintain sealing performance where low seating stress is a concern. Rubber Fab specifically positions the Ansi-Flex 150# for applications such as PVC piping and glass-lined piping, where conventional gasket materials may be less forgiving. The design delivers steam resistance, elastomer-like memory, and longer service life than standard flange gaskets.

Rubber Fab also recommends the Ansi-Flex 150# for higher performance under SIP/CIP conditions. The Ansi-Flex platform is suited for steam, pure water, and process fluid service and is designed to maintain a seal through wide temperature variations. Standard published dimensions cover nominal pipe sizes from 1/2 in through 8 in, with additional 10 in and 12 in sizes available by factory consultation.

Key Features

• PTFE contact surface unitized to an EPDM rubber inner core
• Totally bonded construction combines PTFE product contact with elastomer memory
• Designed for low seating stress flange applications
• Steam-resistant design for demanding sanitary process service
• Supports improved sealing performance under SIP/CIP conditions
• Helps maintain a seal through temperature variation
• Extended service life compared with standard flange gaskets
• Well suited for PVC piping and glass-lined piping applications

Technical Specifications

• Product Type: ANSI 150# full face flange gasket
• Construction: PTFE contact surface unitized to EPDM rubber inner core
• Materials: Polytetrafluoroethylene (PTFE) contact surface, EPDM inner core
• Available Nominal Pipe Sizes: 1/2 in, 3/4 in, 1 in, 1-1/4 in, 1-1/2 in, 2 in, 2-1/2 in, 3 in, 4 in, 6 in, 8 in; 10 in and 12 in available by factory consultation
• Published Thickness: 0.197 in
• Temperature Range: -20 F to 300 F
• Service Guidance: Suitable for steam, pure water, and process fluid service per Rubber Fab sanitary gasket guidelines; application dependent
• Published Outside Diameter Range: 3.386 in to 13.386 in
• Published Inside Diameter Range: 0.708 in to 7.874 in
• Published Bolt Circle Diameter Range: 2.362 in to 11.732 in
• Published Hole Diameter Range: 0.630 in to 0.866 in
• Hole Count: 4 holes for 1/2 in to 3 in sizes; 8 holes for 4 in to 8 in sizes
• Pipe Connection: ANSI Flange
• Part Number Series: FF-AF-E-050-150#-.197 through FF-AF-E-800-150#-.197, depending on nominal pipe size
• Certifications: No product-specific certifications stated in the provided documentation

Typical Applications

The Ansi-Flex 150# gasket is best suited for low seating stress ANSI flange sealing in sanitary and industrial process systems, including:

• PVC piping systems
• Glass-lined piping systems
• SIP/CIP process lines
• Steam service
• Pure water service
• Food and beverage processing systems
• Life sciences and sanitary utility systems
• Chemical process service
• General industrial flange sealing where PTFE contact and elastomer memory are beneficial