PTFE Seal — Material Specifications, Engineering Data & OEM Supply
HEMSUN ENGG. INDUSTRIES manufactures PTFE Seal in Dahegam, Gandhinagar, Gujarat, India for high-performance industrial sealing, chemical processing, and valve OEM applications. Engineered from 100% virgin and custom-filled PTFE fluoropolymer, featuring chemical inertness (pH 0–14), wide operating temperature (-200°C to +260°C), and precision CMM-inspected tolerances for domestic and export supply.
Where PTFE Seal is used
Dynamic or static sealing element retaining pressure at a moving or fixed interface.
PTFE is chosen for near-universal chemical inertness, a −200°C to +260°C service band, and the lowest friction of the common engineering polymers.
A seal is specified where the interface must hold pressure or exclude media; a washer in the same material is specified where the job is to carry axial load and separate two faces.
The seal form is specified for a fixed or dynamic interface holding pressure; where the joint must also absorb axial movement, a bellows is specified instead.
Key properties
In-house PTFE Seal production
moulding and CNC under one roof
Drawing, CAD (STEP/IGES/DXF), or sample-based reverse engineering
PTFE grade options matched to chemical and thermal duty
Dimensional inspection with reports on request
IEC-registered exporter
worldwide packing and docs
Flexible MOQ
prototypes, pilot lots, recurring OEM supply
Specifications
| Property | Value |
|---|---|
| Component Type & Grade | PTFE Seal (Specification Code HES-925) |
| Base Raw Material | PTFE fluoropolymer (Virgin FDA 21 CFR 177.1550 / Custom Filled) |
| Continuous Service Temp. | -200°C to +260°C (-328°F to +500°F) |
| Tensile Strength at Break | 20 to 35 MPa (Virgin) / 14 to 25 MPa (Filled) |
| Elongation at Break | 250% to 450% (ASTM D4894) |
| Specific Gravity / Density | 2.14 to 2.18 g/cm³ (ASTM D792) |
| Dielectric Strength | 50 to 80 kV/mm (0.1 mm film) |
| Surface Roughness Finish | Diamond Polished Ra ≤ 0.20 µm to Ra ≤ 0.40 µm |
| Dimensional Tolerance | ISO Grade 1 to Grade 3 / Drawing Nominals (±0.02 mm) |
| Manufacturing & Origin | Moulded, Sintered & CNC Machined in Dahegam, Gandhinagar, Gujarat, India |
Manufacturing process
Our dedicated manufacturing cells produce PTFE Seal from premium PTFE fluoropolymer powder stock. After uniaxial preforming in precision tooling, components undergo computer-monitored sintering cycles and diamond-tooled CNC profiling to hold exact drawing dimensions.
Material selection notes
The PTFE fluoropolymer material utilized in PTFE Seal exhibits exceptional dielectric insulation (up to 80 kV/mm) and zero moisture absorption (<0.01%). It withstands thermal cycling between cryogenic temperatures and +260°C without embrittlement or dimensional degradation in demanding industrial environments.
How to specify your order
For engineering consultation on PTFE Seal, send your component specifications, media compatibility parameters, and production batch sizes. We provide material datasheets, sample trial options, and detailed technical quotes within one business day.
Quality checks and inspection
Each shipment of PTFE Seal is verified through comprehensive QA benchmarks: CMM dimensional layout, density gradient analysis, high-voltage insulation breakdown testing, and certified inspection reports.
Ordering and export documentation
Domestic PTFE Seal orders ship with GST invoice and e-way bill where applicable. Export orders include commercial invoice, packing list, and certificate of origin from our IEC-registered works. Recurring supply schedules supported with fixed drawing revision and lot numbering for plant stores Contact info@hemsun.com or sales@hemsun.com with your seals specification.
Export packing and lead time
We provide full export support for PTFE Seal orders worldwide. International documentation includes Certificate of Origin, packing lists, material safety data sheets, and custom export crating designed to withstand long-distance maritime transit.
Storage and handling
Maintenance and care for PTFE Seal: Clean components using neutral solvent degreasers or warm water solutions. Avoid metal scrapers or abrasive pads that could abrade the precision-machined sealing surfaces.
Compliance & Standards
HEMSUN is a DGFT IEC registered exporter (Government of India). Sealing faces are inspected for flatness and finish, thickness verified on calibrated gauges, and sintered density checked per ASTM D792. A mill test certificate ships with the order. Export paperwork — commercial invoice, packing list and certificate of origin — accompanies international despatch.
Frequently Asked Questions
Which filled PTFE grade is best for valve seats under high pressure?
Glass-Filled PTFE (15–25% glass fibre) is the most widely specified grade for valve seats under sustained high pressure — it provides significantly improved compressive strength, creep resistance, and dimensional stability compared to virgin PTFE. Bronze-Filled PTFE is recommended for the highest-pressure valve seat applications in oil and gas service.
Can PTFE Seals replace rubber seals in aggressive chemical service?
Yes. PTFE Seals are specifically used to replace rubber seals in applications where process chemicals attack EPDM, NBR, or Viton — strong acids, strong alkalis, chlorinated solvents, and highly aggressive organic chemicals that degrade elastomeric seals within months. PTFE Seals deliver years of reliable service in the same chemical environments.
What sizes of PTFE Seals do you manufacture?
We manufacture PTFE Seals from 5mm ID to 500mm ID, OD up to 700mm, and thickness from 1mm to 100mm. Custom seal profiles and cross-sections are manufactured from customer drawings or physical samples.
Do you export PTFE Seals to Germany and Japan?
Yes. We regularly export PTFE Valve Seals, Pump Seals, and Mechanical Seals to valve OEMs and pump manufacturers in Germany, Japan, USA, UAE, Singapore, Brazil, Turkey, and the Middle East.
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