Thermoplastic Flanges
Standard ANSI / DIN Pattern Flanges for Bolted-Joint Pipeline Connections
DN 25 – DN 200
Size Range
Bolted Flange
Connection
PP / PPH / PVDF
Material
PN 6 / 10 / 16
Pressure
Thermoplastic Flanges for Pipeline Connections
UNP’s Thermoplastic Flanges include both the loose backing flanges (steel, SS, or aluminium) used with our Stub Ends, and full-faced thermoplastic flanges for direct flange-to-flange joints.
Loose backing flanges (most common) are bolted to a metal flange on the other side, with the thermoplastic stub end acting as the wetted sealing face. This keeps all wetted parts in plastic while providing the bolt-clamping strength of a metal flange.
Solid thermoplastic flanges are available for joints where the entire flange must be non-metallic (e.g., in EMI-sensitive cleanroom environments or where the entire installation must be metal-free).
Why Choose This Fitting
- ✓Loose backing flanges (steel, SS, Al)
- ✓Solid thermoplastic flanges (full plastic option)
- ✓ANSI B 16.5 150# / DIN PN 10 / PN 16 patterns
- ✓Sizes DN 25 through DN 200
- ✓Use with matching stub ends
Dimensions, Materials, Testing
Backing Flange Dimensions (DIN PN 10)
All dimensions in millimeters unless noted.
| Pipe Size | Flange OD (mm) | P.C.D (mm) | Bolt Holes | Bolt Size | Flange Thk (mm) |
|---|---|---|---|---|---|
| 25 | 100 | 75 | 4 | M12 | 14 |
| 32 | 120 | 90 | 4 | M12 | 14 |
| 40 | 130 | 100 | 4 | M12 | 16 |
| 50 | 140 | 110 | 4 | M12 | 18 |
| 63 | 160 | 125 | 4 | M16 | 18 |
| 75 | 180 | 145 | 4 | M16 | 20 |
| 90 | 190 | 160 | 4 | M16 | 20 |
| 110 | 220 | 180 | 8 | M16 | 22 |
| 125 | 250 | 210 | 8 | M16 | 22 |
| 160 | 285 | 240 | 8 | M20 | 24 |
| 200 | 340 | 295 | 8 | M20 | 26 |
Materials of Construction
| Material | Description |
|---|---|
| PP (Polypropylene) | General-purpose, low-cost option for mildly corrosive media at moderate temperatures. |
| PPH (Polypropylene Homopolymer) | Higher mechanical strength than PP — better for pressure service. |
| PVDF (Polyvinylidene Fluoride) | Superior abrasion resistance and high mechanical strength. |
| ISO.PP (Isotactic Polypropylene) | Improved temperature and chemical resistance vs standard PP. |
Connection Types Available
| Connection | Description |
|---|---|
| Socket Weld | Heat-fused socket joints for permanent, leak-tight assemblies. |
| Butt Weld | End-to-end heated fusion for in-line pipe sections. |
| Threaded | Removable threaded fittings for serviceable connections. |
| Flanged | Bolted flange joints for easy disassembly and inspection. |
Testing & Quality
| Test | Standard / Result |
|---|---|
| Hydrostatic Test | BS EN 12266-1 / DIN 8077 / DIN 8078 |
| Visual / Dimensional Inspection | 100% Sampled |
| Pressure Rating | PN 6 / PN 10 / PN 16 (depending on size & material) |
| Temperature Range | 0°C to 80°C (PP) / 0°C to 95°C (PPH) / -40°C to 140°C (PVDF) |
| Certifications | ISO 9001:2015 |
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Order Your Thermoplastic Flanges
Tell us your pipe size, flange standard (ANSI/DIN), and backing flange material — we’ll supply matching flanges.