Description
Product Detail
PTFE threaded flanges are non-welded flange components designed with female threaded bores for direct connection to threaded pipe or fittings. They combine the chemical resistance and low friction of PTFE with practical assembly in systems where welding is not preferred. These flanges are commonly used for corrosive media handling, low to medium pressure chemical lines, water treatment skids, dosing systems, and light-duty process piping.
SASA FLANGE supplies PTFE threaded flanges in standard and customized dimensions with options in virgin PTFE, filled PTFE, and PTFE-lined metallic backing constructions. Every order can be supported by chemical analysis of metallic components, mechanical testing, dimensional inspection, PMI testing for stainless or alloy backing flanges, EN 10204 3.1 certificate, and full heat number traceability to meet international project requirements.
- ✓Product Name: PTFE Threaded Flanges
- ✓Material Grade: Virgin PTFE, Glass-filled PTFE, Carbon-filled PTFE, PTFE-lined A105, PTFE-lined F304/F316
- ✓Product Type: Screwed / Female Threaded Flange
- ✓Main Feature: Excellent corrosion resistance, non-welded installation, low friction, good sealing performance in chemical service
- ✓Applications: Chemical processing, water treatment, pharmaceutical systems, marine piping, acid and alkali transfer lines
Product Parameters
| Product Name | PTFE Threaded Flange |
| Material Grade | Virgin PTFE, Glass-filled PTFE, Carbon-filled PTFE, PTFE-lined ASTM A105, PTFE-lined ASTM A182 F304/F316 |
| Material Type | PTFE polymer flange or PTFE-lined metallic backed flange |
| Product Form | Threaded / Screwed Flange, Female NPT / BSPT / BSPP thread |
| Size Range | DN15 – DN300 (1/2 inch – 12 inch) |
| Pressure Class | Class 150 – 300 / PN10 – PN40 |
| Sealing Face | RF, FF |
| Surface Treatment | Natural PTFE machined finish, Passivated stainless steel backing, Anti-rust oil or painted carbon steel backing |
| Standard | ASME B16.5, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The chemical composition below is provided as a typical reference for PTFE and common metallic backing flange materials. Final composition depends on the selected construction, applicable standard, and issued mill test certificate. For PTFE-lined products, polymer purity and filler content are controlled during production, while metallic backing flanges follow relevant ASTM or EN material specifications.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A105 backing flange % | 0.35 max | 0.35 max | 0.60-1.05 | 0.035 max | 0.040 max | 0.30 max | 0.40 max | 0.12 max | Cu 0.40 max |
Mechanical Properties
Mechanical properties vary according to flange construction, selected metallic backing grade, processing method, and service temperature. PTFE itself is a soft corrosion-resistant material with lower strength than forged steel, so pressure capability is determined by design and reinforcement. The values below are typical reference data for common PTFE and backing flange materials used in threaded flange assemblies.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Virgin PTFE | 20-30 MPa | 10-15 MPa | 200% min | 50-65 Shore D | 2.15 g/cm3 |
| ASTM A105 backing flange | 485 MPa min | 250 MPa min | 22% min | 187HB max | 7.85 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 300 | RF / FF | Virgin PTFE, PTFE-lined A105 | Stock / Production |
| DN65 – DN150 | Class 150 – 300 | RF / FF | Virgin PTFE, Glass-filled PTFE, PTFE-lined A105/F316 | Stock / Production |
| DN200 – DN300 | Class 150 – 300 | RF / FF | PTFE-lined A105, PTFE-lined F304/F316 | Production |
| DN15 – DN300 | PN10 – PN40 | RF / FF | Virgin PTFE, Filled PTFE, PTFE-lined metallic flange | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| Virgin PTFE Threaded Flange | Machined from virgin PTFE for maximum chemical purity and corrosion resistance | Acid, alkali, pharmaceutical, and ultrapure fluid service |
| Glass-filled PTFE Threaded Flange | PTFE reinforced with glass fiber for improved compressive strength and reduced creep | Chemical lines with higher mechanical load and moderate temperature |
| Carbon-filled PTFE Threaded Flange | PTFE with carbon filler for better wear resistance and dimensional stability | Process service requiring improved durability and antistatic performance |
| PTFE-lined Steel Threaded Flange | PTFE corrosion barrier combined with carbon steel or stainless steel backing strength | Corrosive media pipelines where higher structural support is required |
Equivalent Standards and International Names
PTFE threaded flanges can be produced to multiple international dimensional systems depending on project location and piping specification. The flange drilling, outside diameter, and facing follow the selected standard, while the threaded bore is machined to the required pipe thread form. Metallic backing flanges are supplied in equivalent regional grades where applicable.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 | PTFE with ASTM A105 or ASTM A182 F316 backing flange |
| Europe | EN 1092-1 | PTFE with P245GH or 1.4404 stainless backing flange |
| Germany | DIN 2565 / 2566 | PTFE with C22.8 or 1.4571 backing flange |
| Japan | JIS B2220 | PTFE with SS400 or SUS304/SUS316 backing flange |
| China | GB/T 9119 | PTFE with 20# steel or 304/316 stainless backing flange |
Production Process Flow
SASA FLANGE controls each manufacturing stage from raw material verification to final packing. For PTFE threaded flanges, machining accuracy, thread quality, flange flatness, and material compatibility are carefully checked to ensure safe installation and stable service performance.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified PTFE stock, forged steel blanks, or stainless backing materials | Material certificate and traceability |
| Forging | Hot forging of metallic backing flange where required | Forging temperature and reduction ratio |
| Heat Treatment | Normalizing, tempering, solution annealing, or stress relief for metal parts | Temperature and holding time control |
| Machining | Machine flange OD, sealing face, threaded bore, and bolt holes | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
For PTFE-lined and metallic backed threaded flanges, chemical analysis is performed on the steel or stainless backing materials to confirm compliance with the specified grade such as ASTM A105 or A182 F316. PTFE raw materials are verified against internal quality requirements for purity and filler ratio to ensure suitable corrosion resistance and processing consistency.
2. Mechanical Properties Testing
Mechanical testing is carried out on the metallic backing flange material according to the applicable standard and project requirement. Typical tests include tensile strength, yield strength, elongation, and hardness. For PTFE components, density and visual integrity are checked to support dimensional stability and service performance in threaded assembly applications.
3. Dimensional Inspection
Each PTFE threaded flange is inspected for outside diameter, thickness, bolt circle, bolt hole size, flange face flatness, and thread accuracy. Sealing face finish and concentricity are also checked to ensure proper mating with valves, fittings, and threaded pipe ends. Inspection records can be provided to support project QA documentation.
4. PMI Testing and Hydrostatic Testing
PMI testing is available for stainless steel and alloy metallic backing flanges to verify the supplied material grade before shipment. Hydrostatic testing may be arranged on assembled components or associated piping items according to customer specification. SASA FLANGE can provide EN 10204 3.1 certificate, inspection report, and full traceability documentation with each order.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
PTFE threaded flanges are widely used in industries handling corrosive fluids, aggressive chemicals, and non-welded utility lines. Their threaded connection simplifies installation and maintenance, while PTFE provides excellent resistance to acids, alkalis, and many solvents. They are especially suitable for compact systems, skid-mounted equipment, and applications where clean service and chemical inertness are important.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Chemical injection lines, utility systems, analyzer panels | Provides corrosion resistance in low-pressure threaded service without welding |
| Chemical Processing | Acid transfer lines, alkali dosing systems, solvent handling units | PTFE offers broad chemical resistance and low reactivity |
| Power Generation | Chemical dosing skids, demineralized water systems, auxiliary piping | Suitable for compact service lines requiring easy assembly and maintenance |
| Water Treatment | Dosing pumps, chlorine and reagent lines, RO skid piping | Resists aggressive treatment chemicals and supports quick threaded installation |
| Marine and Offshore | Corrosive utility lines, treatment systems, chemical storage transfer piping | Good corrosion resistance and practical use in modular threaded systems |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Threaded Flanges for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a PTFE threaded flange?
A: A PTFE threaded flange is a screwed flange designed with an internal thread so it can be connected to threaded pipe without welding. It is made from pure PTFE, filled PTFE, or PTFE-lined metal-backed construction. This type is mainly used in corrosive service, light to medium pressure piping, and systems where quick installation or maintenance is required.
Q: What materials are available for PTFE threaded flanges?
A: SASA FLANGE can supply PTFE threaded flanges in virgin PTFE, glass-filled PTFE, carbon-filled PTFE, and PTFE-lined carbon steel or stainless steel construction. For reinforced designs, common metallic backing materials include ASTM A105, ASTM A182 F304, and ASTM A182 F316. Material selection depends on chemical media, service temperature, pressure, and mechanical load.
Q: What pressure class is supported?
A: PTFE threaded flanges are commonly supplied in ASME Class 150 and Class 300, or EN/DIN pressure ratings such as PN10, PN16, PN25, and PN40 depending on size and design. Because PTFE is softer than forged steel, the final pressure capability must consider temperature, media, construction type, and whether the flange is solid PTFE or PTFE-lined with metal backing.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can produce PTFE threaded flanges in custom dimensions, drilling patterns, flange thicknesses, sealing faces, and thread forms including NPT, BSPT, and BSPP. We also support custom PTFE grades, filled compounds, and PTFE-lined metal-backed designs based on drawings, application data, and project specifications for international industrial buyers.
Q: What certificate is provided?
A: SASA FLANGE can provide EN 10204 3.1 material certificate for metallic backing materials, along with MTC, dimensional inspection report, and PMI test report when required. Hydrostatic testing can also be arranged according to project specification or assembly requirement. Full heat number traceability is maintained for applicable metal components to support export and EPC documentation needs.
Contact Us
If you are looking for ptfe threaded flanges or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
