ENVELOPE GASKET

Envelope Gaskets are specialized composite gaskets where a soft filler (like rubber or compressed sheet) is enclosed inside a thin outer envelope of chemically resistant material like PTFE (Teflon®). This construction provides excellent chemical resistance on the outside and resilient sealing from the inner core, making them ideal for aggressive media, pharma, food, and chemical industries. 

• PTFE Outer Layer – Excellent chemical, thermal & non-stick properties

• Soft Filler Core – Provides compressibility and sealing
  Available in Split or Moulded Envelopes

• Non-Contaminating – Suitable for sterile applications

• FDA Compliant PTFE on request

• Custom Sizes & Shapes Available

• Slit Envelope: One side slit PTFE, common & cost-effective option

• Moulded (Machined) Envelope: Seamless design for high integrity & hygiene

• U-Type Envelope: PTFE wraps around filler in U-shape

• CAF / Compressed Asbestos-Free: General-purpose use, good compressibility

• EPDM / Neoprene / Nitrile Rubber: Food, pharma, oil-based media

• Silicone Rubber: High-temp, hygienic, dairy, and pharma use

• Viton® / FKM: Aggressive chemical environments

• Standard sizes: DN15 to DN600

• Custom outer/inner diameters available

• Thickness: 3 mm to 5 mm standard (customizable)

• Chemical Processing – Acid, alkali & solvent resistance

• Pharmaceutical & Biotech – Contamination-free sealing

• Food & Beverage – Safe for hygiene-critical equipment

• Water Treatment Plants

• Petrochemical & Gas Units 

Q: Why use envelope gaskets over full PTFE gaskets?
A: Envelope gaskets combine PTFE's chemical resistance with the compressibility of rubber, giving better sealing under moderate bolt loads.

Q: Can envelope gaskets be reused?
A: Typically not recommended due to deformation of the inner filler, especially under high pressure.

Q: Are FDA-compliant PTFE materials available?
A: Yes! We provide FDA-grade envelope gaskets for food and pharma sectors.

Q: What’s the maximum temperature they can handle?
A: PTFE can withstand up to 260°C, though the inner filler material will define the overall temperature limit.

• Premium PTFE & Filler Materials

• Tailor-Made Gaskets to Fit Your Needs

• Quick Turnaround & Bulk Order Support

• Trusted by Pharma, Dairy & Chemical Giants