PTFE Encapsulated Sleeve for High-Purity and Corrosive Media Sealing

The PTFE Encapsulated Sleeve from Chunhuan is manufactured from 100% virgin, unmodified PTFE using a seamless molding process. With no adhesive layers or fillers, it forms a permanent encapsulation over metal or elastomeric substrates, creating an exceptionally pure and corrosion-resistant sealing interface.

Its extreme chemical inertness allows it to withstand over 98% of aggressive media, including concentrated sulfuric acid, aqua regia, and organic solvents, completely eliminating delamination risks. The naturally low coefficient of friction (as low as 0.05) provides permanent self-lubrication, enabling dynamic seals to operate maintenance-free for over 15,000 hours, significantly reducing equipment downtime costs.

Certified to FDA, USP Class VI, and EU 10/2011 standards, it is safe for pharmaceutical and food-contact applications. Its ultra-low surface energy (18–22 mN/m) prevents sticky material buildup, eliminating seal failure due to contamination.

Key Features

• Extreme Chemical Resistance – Withstands >98% of corrosive media without degradation.

• Zero-Contamination Design – 100% virgin PTFE, compliant with FDA, USP Class VI, and EU 10/2011.

• Wide Temperature Tolerance – Flexible at -200°C, stable up to +260°C (short-term 300°C).

• Low Friction & Self-Lubricating – Friction coefficient as low as 0.05 for extended wear life.

• Electrical Insulation – Dielectric strength > 60 kV/mm, ideal for electrochemical environments.

• Long Service Life – 8–10x longer lifespan than filled PTFE or rubber seals under dynamic conditions.

Technical Specifications

• Material: 100% virgin PTFE (no fillers, no adhesive layers)

• Working Temperature: -200°C to +260°C (short-term 300°C)

• Work Pressure: ≤ 10 MPa (depends on encapsulation design & substrate strength)

• Density: 2.1–2.3 g/cm³

• Dielectric Strength: 10 kV/mm (reinforced > 60 kV/mm)

• Shrinkage Percentage: < 0.4%

• Elongation at Break: ≥ 150%

• Tensile Strength: ≥ 15.0 MPa

• Water Absorption: < 0.01%

• Color: White (opaque)

• Origin: China

• Trademark: Chunhuan

• Packaging: Standard export package (moisture-proof film + carton or pallet)

Applications

• Chemical Reactor Agitator Shaft Seals – Prevents acid gas crystallization and corrosion.

• Aseptic Rotary Joints in Pharmaceutical Filling Lines – Eliminates cross-contamination risks.

• Food Sauce Filling Valves – Meets food-grade compliance requirements.

• Semiconductor Ultra-Pure Chemical Transfer Fittings – Prevents metal ion contamination.

• Cryogenic LNG Valve Stem Encapsulation – Maintains flexibility and sealing in deep-cold environments.

Packaging & Delivery

Each sleeve is packaged in a clean, moisture-proof environment to maintain purity. Export-ready cartons or pallets available for global shipping. Custom sizes and encapsulation designs can be provided according to customer requirements.