UPVC Stub End Flange
The UPVC Stub End Flange is a two-part pipe fitting used in conjunction with a backing ring to create a secure, detachable flanged joint in a piping system. Made from Unplasticized Polyvinyl Chloride (UPVC), the stub end flange is highly resistant to corrosion and chemicals. It is commonly used in water supply, chemical handling, and industrial applications where easy disassembly and maintenance of the pipeline are required.
UPVC Stub end flange comes in three main types: Type A, Type B, and Type C. Each has a different design and compatibility with lap joints and slip-on flanges. Type A works best with lap joint flanges, while Type B fits slip-on flanges. Type C is more versatile and works with both, but has a slightly different design. The right type depends on how the UPVC stub end flange will be connected to the UPVC stub end flange, whether the application requires easy bolt alignment, frequent disassembly, or cost savings.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
UPVC Stub End Flange Details
NB: Nominal Bore
OD: Outer Diameter
ID: Inner Diameter
WT: Wall Thickness
L: Total Length
H: Depth/Height of Socket
| Size (NB) | OD (mm) | ID (mm) | WT (mm) | L (mm) | H (mm) |
| 15 (½″) | 21.34 | 15.80 | 2.77 | 26 | 16 |
| 20 (¾″) | 26.67 | 20.93 | 2.87 | 28 | 18 |
| 25 (1″) | 33.40 | 26.64 | 3.38 | 30 | 20 |
| 32 (1¼″) | 42.16 | 35.00 | 3.56 | 34 | 22 |
| 40 (1½″) | 48.26 | 40.89 | 3.68 | 36 | 24 |
| 50 (2″) | 60.33 | 52.51 | 3.91 | 40 | 25 |
| 65 (2½″) | 73.03 | 64.09 | 4.01 | 45 | 28 |
| 80 (3″) | 88.90 | 77.93 | 4.49 | 50 | 30 |
| 100 (4″) | 114.30 | 100.77 | 4.85 | 60 | 34 |
| 125 (5″) | 141.30 | 125.73 | 5.28 | 66 | 38 |
| 150 (6″) | 168.28 | 152.21 | 5.54 | 72 | 40 |
| 200 (8″) | 219.08 | 202.74 | 6.17 | 80 | 45 |
| Parameter / Feature | Details & Specifications |
| Product Name | UPVC Stub End Flange |
| Material | Unplasticized Polyvinyl Chloride (UPVC) |
| Function | Forms a detachable flanged joint with a backing ring |
| Type | Stub End (Lap Joint Type) |
| Connection Type | Stub end with loose flange (backing ring) |
| Size Range | ½” to 12” (15 mm to 315 mm) |
| Pressure Rating | Up to 10 bar (PN10), some variants up to 15 bar |
| Temperature Range | 0°C to 60°C |
| Flange Standards | ANSI, DIN, BS |
| Color | Grey (standard) |
| Manufacturing Process | Injection molded |
| Jointing Method | Solvent weld + bolted flange connection |
| Applications | Water supply, chemical processing, irrigation, industrial piping |
| Corrosion Resistance | Excellent resistance to chemicals, acids, and alkalis |
| Mechanical Strength | High rigidity and structural strength |
| Pressure Resistance | Suitable for low to medium pressure systems |
| Weight | Lightweight, easy to handle and install |
| Surface Finish | Smooth sealing face ensures leak-proof joints |
| Durability | Long service life with minimal wear |
| Thermal Conductivity | Low (good insulation properties) |
| Chemical Resistance | Suitable for aggressive fluids and corrosive environments |
| UV Resistance | UV stabilized grades available |
| Maintenance | Easy disassembly for maintenance and inspection |
| Installation | Quick assembly using backing ring and bolts |
- Excellent corrosion resistance
- UPVC Stub End Flange does not rust scale and corrode due to making it ideal for water and chemical applications.
- UPVC Stub End Flange does not rust scale and corrode due to making it ideal for water and chemical applications.
- High chemical resistance
- These are resistant to mostly acids, alkalis, and salts used in industrial, chemical and water-treatment systems.
- Easy installation & dismantling
- It works with a loose backing flange, also allowing quick assembly and easy removal for maintenance.
- Lightweight construction
- Upvc Stub End Flange is much lighter than other metal flanges,and also this simplifies the handling and reduces installation time.
- Strong & leak-proof joint
- They provide uniform gasket compression for a tight and reliable seal.
- Cost-effective solution
- Upvc stub end flanges have lower material and maintenance costs compared to metal flange systems.
- Smooth internal bor
- Minimizes friction loss and prevents scaling or material buildup.
- Compatibility with standard flanges
- Upvc stub end flange can be used with PP, MS, GI, or SS backing flanges as per standards.
- Good pressure performance
- Suitable for typical UPVC piping pressure ratings (varies by size and standard).
- Long service life
- Upvc stub end flanges are durable of material with low maintenance requirements.
| Pressure Class (PN) | Max Working Pressure (bar) | Max Working Pressure (psi) | Typical Use |
| PN 6 | 6 bar | ~87 psi | Low-pressure water lines |
| PN 10 | 10 bar | ~145 psi | Water supply, irrigation |
| PN 12.5 | 12.5 bar | ~181 psi | Industrial piping |
| PN 16 | 16 bar | ~232 psi | High-pressure water |
| PN 20 | 20 bar | ~290 psi | Special industrial use |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using UPVC Stub End Flange
Cost-Effectiveness for Lighter Applications
Type B upvc stub ends flange are particularly suitable for applications where lighter schedules are used to provide a cost-effective solution for flanged connections in less demanding environments.
Ease of Flange Alignment
The squared-off design of the lap allows for easy alignment with lap joint flanges, facilitating the assembly and maintenance of the chemical system.
Simplified Fabrication
The simpler geometry of Type B stub ends can offer advantages in terms of fabrication and material costs, especially when dealing with thinner-walled piping systems.
Application Versatility
While commonly used in lower-pressure and temperature applications compared to Type A, Type B stub ends are still versatile and can be found in various industries, including water treatment, chemical processing, and other general industrial applications.
Types and Uses of UPVC Reducer Bushing
Type A
Designed for Lap Joint Stub end flanges
This stub-end flange has a machine face and lap thickness so that it is equal to or exceeds the wall thickness. The outer corner has a precise radius to fit a lap joint stub end flange, making it easy to rotate and align bolt holes.
Type B
Compatible with Slip-on stub end flanges
Unlike Type A, this stub end is made up to work with slip-on stub end flanges used as lap joint stub end flanges. It has a smaller outer radius, which allows slip-on flanges to sit properly. The machined face ensures a tight seal.
Type C
A Universal Fit
Type C upvc stub ends flange are the shortest and most adaptable. They can be used with both lap joints and slip-on flanges. The inside edge is flared with a rounded transition, but it can be machined to a square edge if needed.
Why Choose Petron Thermoplast?
UPVC Stub ends flanges keep connections simple and cost-effective. Selecting the right type depends on your UPVC flange setup, material, and pressure requirements. At Petron Thermoplast, we manufacture UPVC stub end flanges that meet ASME and MSS standards.
UPVC Stub End Flange Compatibility
Type A works with lap joint upvc stub end flanges. Type B fit slip-on upvc stub end flanges used as lap joints. Type C does both but has a smooth lap instead of a machined face.
Material Selection
- Fluid compatibility
- Operating temperature
- Pressure rating
- Standards/Regulations
Length and Pressure Rating
MSS is short for low pressure. ANSI is long for high pressure. Match the length to your system, and you’re set.
UPVC Pipe Fittings
We offer UPVC Pipe Fittings products in all standard sizes and provide complete customization options to meet your specific project requirements across our entire product range.
