PTFE Gaskets (Envelope & Solid Type)
Static Flange Sealing Solutions
PTFE Gaskets for Aggressive Chemicals
Sag Engineers produces high-integrity PTFE Gaskets engineered for static sealing of highly corrosive, toxic, and high-purity media in chemical, pharmaceutical, and fertilizer processing lines.
Product Specifications:
- Gasket Types: Envelope Gaskets (Milled & Slit types) and 100% Solid Cut PTFE Gaskets
- Envelope Construction: Pure PTFE virgin jacket with Non-Asbestos (CNAF), Compressed Asbestos (CAF), or Corrugated Stainless Steel / Rubber core inserts
- Milled Type: Precision CNC machined pocket ensuring full flat face contact against glass-lined and delicate flanges
- Slit Type: Cost-effective folded or slit envelope for standard industrial pipe connections
- Size Range: 12mm NB onwards with standard flap thickness of 0.5mm (custom flap thicknesses on request)
- Solid PTFE Gaskets: Custom punched, laser cut, and waterjet cut in all shapes and sizes up to 1100mm O.D. Maximum
Typical Plant Installations:
Glass-lined steel piping, reactors, sight glasses, and column manhole covers.
Sulfuric, nitric, and hydrochloric acid transfer lines operating up to 260°C.
High-purity pharmaceutical batch synthesis and food grade hygienic clamp gaskets.
Gasket Types & Flange Compatibility
| Gasket Style | Insert Core Material | Standard Flange Sizes | Max Temperature | Primary Advantage |
|---|---|---|---|---|
| Milled Envelope | CNAF / CAF / CS Corrugated | 15mm NB to 600mm NB | 260°C | Flat flange face, ideal for fragile glass lining |
| Slit Envelope | Compressed Sheet Insert | 15mm NB to 500mm NB | 220°C | Cost-effective static sealing for steel pipes |
| 100% Solid PTFE | Pure Virgin or Expanded PTFE | Up to 1100mm OD Max | 260°C | Maximum purity, zero contamination, full face/ring |
| Elliptical / Manhole | Reinforced CNAF Core | Custom Boiler / Tank sizes | 240°C | Precision fit for non-circular vessel manways |
| Expanded PTFE (ePTFE) | Multi-directional expanded | Standard ANSI 150/300# | 280°C | Conforms to irregular, warped, or pitted flanges |