Custom Virgin & Expanded PTFE Gaskets | Chemical Flange Seals

Product Overview & Custom Manufacturing

Engineered for critical industrial sealing applications, our custom PTFE gaskets deliver zero-leak performance across aggressive chemical environments and high-purity processes. Manufactured using high-density virgin PTFE or micro-cellular expanded PTFE (ePTFE), these gaskets provide outstanding bolt load retention and seal integrity for standard ASME/ANSI pipe flanges, glass-lined equipment, and specialized OEM housings.

Utilizing precision CNC digital cutting and die-stamping technology, we produce full-face, ring, oval, and multi-hole custom profile gaskets without expensive tooling delays.

Key Performance Benefits

• Complete Chemical Inertness: Unaffected by nearly all chemical media (pH 0–14), including hot nitric acid, hydrofluoric acid, concentrated alkalis, and organic solvents.

• Low Creep & Cold Flow Resistance: High-grade virgin and expanded fluoropolymer structures maintain bolt torque and minimize stress relaxation over long operational cycles.

• High Temperature & Thermal Stability: Operates continuously from cryogenic temperatures (-200°C / -328°F) up to +260°C (+500°F).

• FDA & Purity Compliance: Non-contaminating, non-toxic, and non-stick formulation suitable for ultra-clean pharmaceutical, semiconductor, and food contact lines.

• Superior Surface Adaptability: Conforms smoothly to pitted or slightly irregular flange faces to establish a tight seal at low bolt torque.

Technical Specifications

• Material Grades: Virgin PTFE, Expanded PTFE (ePTFE), PTFE Envelope, or Filled PTFE (Glass/Carbon/Bronze filled for elevated pressures).

• Standard Dimensions: ANSI/ASME B16.21 Class 150/300, EN 1092-1 (PN10/16/40), DIN, and JIS standards.

• Custom Profiles: Full Face (FF), Raised Face (IBC Ring), Oval 2-Bolt Flange, Rectangular, and custom OEM drawings.

• Thickness Range: 0.5 mm to 6.0 mm (1/32" to 1/4"); custom thicknesses available upon request.

• Working Temperature: -200°C to +260°C (-328°F to +500°F).

Primary Applications

• Chemical & Petrochemical Processing: Flanged pipe connections, heat exchangers, reactor vessels, and acid transfer lines.

• Pharmaceutical & Biotech: Ultra-pure water systems, sterile processing equipment, and sanitary fluid transfer manifolds.

• Pumps, Valves & Instrumentation: Body seals, sight glass gaskets, bonnet seals, and diaphragm backings.

• Semiconductor & Electronics: High-purity acid etching lines and chemical delivery module sealing.

Quality Assurance & Packaging

• Precision Vernier & Optical Inspection: Every production batch undergoes strict dimensional verification for inner diameter, outer diameter, pitch circle diameter (PCD), and thickness.

• Cleanroom-Grade Packaging: Individual sealed polybag packaging protects gaskets from particulate contamination and moisture before installation.

• Bulk Export Packaging: Neat stacking in reinforced, heavy-duty corrugated cartons to prevent edge deformation or warping during international shipping.