What is PTFE Sheet?
PTFE sheet (Polytetrafluoroethylene sheet) is a semi-finished board manufactured from PTFE resin via molding or isostatic pressing followed by sintering. It is the most widely used industrial fluoroplastic, indispensable in anti-adhesive, chemical-resistant, low-friction and electrical insulation applications. This guide focuses on the sheet form to help buyers rapidly establish material selection and supplier evaluation capabilities.
PTFE Sheet Grade Classification
By Resin Grade
| Grade | Resin Source | Typical Brands | Key Characteristics |
|---|---|---|---|
| Virgin PTFE | 100% virgin PTFE resin, unfilled | Chemours / 3M / Dyneon | Highest purity, best chemical resistance; for semiconductor and pharma |
| Reprocessed / Recycled PTFE | Recycled or reprocessed material | Domestic commodity grade | Lower price, purity ~95-99%; not for high-purity applications |
| Filled PTFE | Virgin PTFE + filler | All major brands | Improved creep resistance, wear resistance or thermal conductivity |
By Filler Type (Filled PTFE)
| Filler Type | Filler Loading | Key Improvement | Typical Applications |
|---|---|---|---|
| Glass Fiber | 15-30% | Wear resistance, dimensional stability | Sealing gaskets, bearings |
| Carbon | 10-25% | Compressive strength, wear, thermal conductivity | High-pressure seals, hydraulic systems |
| Graphite | 5-15% | Self-lubricating, low coefficient of friction | Bearings, slide rails |
| Bronze | 40-60% | Wear resistance, high thermal conductivity, high load | Heavy-duty machinery bearings |
Standard Sheet Dimensions (Common Specifications)
| Thickness (mm) | Width (mm) | Length (mm) | Tolerance Grade |
|---|---|---|---|
| 1 – 5 | 300 / 500 / 1000 / 1200 | 300-2000 | ±0.05 to ±0.3mm |
| 6 – 20 | 300 / 500 / 1000 / 1200 | 300-2000 | ±0.1 to ±0.5mm |
| 21 – 100 | 300 / 500 / 1000 | 300-1000 | ±0.2 to ±1.0mm |
International Standards Reference
| Standard System | PTFE Standard | Coverage |
|---|---|---|
| China GB | GB/T 8326-2002 (PTFE sheet) | Dimensions, tensile strength, elongation, density |
| US ASTM | ASTM D1710 (rod), D3293 (sheet) | Grade classification, physical properties, dimensional tolerances |
| Germany DIN | DIN EN ISO 13000 | General industrial plastic sheet test specifications |
| Japan JIS | JIS K6885 | PTFE sheet physical property requirements |
Pressure-Temperature (P-T) Characteristics
PTFE exhibits significant creep at elevated temperatures – one of the most overlooked parameters during material selection. Filled PTFE can substantially improve creep performance.
| Type | Service Temperature | Max Working Pressure | Creep Behavior |
|---|---|---|---|
| Virgin PTFE | -200C to +260C | ≤10 MPa | Significant creep at high temp; bolt preload compensation required |
| Glass Filled (25%) | -200C to +260C | ≤15 MPa | Creep reduced ~50%; excellent dimensional stability |
| Carbon Filled (25%) | -200C to +260C | ≤20 MPa | Creep reduced ~70%; suitable for high-pressure seals |
Major China Production Regions and Supplier Distribution
Industrial Clusters
- Jiangsu Province, Suzhou: High-end precision PTFE sheet processing; medical and semiconductor grade
- Zhejiang Province, Hangzhou / Ningbo: Filled PTFE for large-volume industrial use
- Guangdong Province, Dongguan / Shenzhen: Fast delivery; dense concentration of export-oriented suppliers
- Shandong / Liaoning Provinces: Integrated raw materials; basic specification sheets
Supplier Types and Reference Pricing
| Type | MOQ | Price Range (CNY/kg) | Typical Lead Time |
|---|---|---|---|
| Trading company (no factory) | 50-200 kg | 80-150 | 7-15 days |
| Trading company (with inspection) | 200-500 kg | 70-130 | 10-20 days |
| Direct factory (basic grades) | ≥500 kg | 50-100 | 20-35 days |
| Direct factory (custom filled) | ≥200 kg (custom) | 90-200 | 30-45 days |
Procurement Cost Structure (Q2 2026 Reference)
Based on 3mm x 1000mm x 1000mm Virgin PTFE sheet (~2.2 kg/sheet):
| Cost Component | Estimated Share | Notes |
|---|---|---|
| Raw material (PTFE resin) | 50-60% | Subject to PFAS regulatory impacts and price volatility |
| Molding and sintering | 15-25% | Varies by compression vs isostatic pressing |
| Cutting and finishing | 5-10% | Custom sizes or drilling add costs |
| Packaging and transport (to port) | 3-8% | FCL vs LCL significantly affects total |
| Certifications and testing (if required) | 2-5% | FDA, REACH, USP Class VI, etc. |
Quality Inspection (Key Metrics for Buyers)
Three Mandatory Checks Upon Receipt
- Appearance and dimensions: Check thickness, width, length within contractual tolerances; no bubbles, cracks, or delamination on surface
- Density test: Virgin PTFE density should be close to 2.14-2.20 g/cm3 (ASTM D792)
- Tensile strength: Virgin PTFE ≥ 20 MPa (ASTM D638M)
Critical Notes
- Request a Certificate of Conformance (CoC) with each shipment, stating resin grade, batch number and inspection date
- Filler loading in filled PTFE significantly affects performance – specify filler type and content range in contracts (e.g., Glass Filled 25% ±2%)
- PTFE is UV-sensitive; prolonged outdoor storage causes surface aging and embrittlement
- Store sheets flat to prevent deformation under long-term pressure
Procurement Decision Checklist
- □ Define application conditions: temperature, pressure, media (determine if filled grade is needed)
- □ Specify standard system: GB / ASTM / DIN / JIS (must be stated in contract)
- □ Define thickness tolerance requirements to avoid acceptance disputes
- □ Require batch Certificate of Conformance + mill test report
- □ Confirm filler ratio range (if applicable)
- □ Third-party inspection: SGS or CTI testing recommended for large orders
- □ Confirm packaging: fumigation certificate required for export?
- □ Monitor PFAS regulatory risk: fluoropolymer supply chains face growing policy scrutiny
Summary
The core of PTFE sheet procurement is clarifying application grade (Virgin vs Filled) and applicable standard system, then locking down filler ratio, thickness tolerance and inspection standards in the contract. Chinese suppliers have mature production capacity for cost-effective filled PTFE sheets, but for medical and semiconductor high-purity applications, priority should be given to suppliers in Suzhou with established quality management systems.
Note: This article is based on publicly available market information and does not constitute a quality endorsement. For bulk procurement, rely on physical sample test results provided by the supplier.
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