CPVC Blind Flange
A CPVC Blind Flange is a solid, flat flange made from Chlorinated Polyvinyl Chloride (CPVC) that is used to close or seal the end of a piping system or pipeline. Unlike other flanges, it does not have a center opening, which allows it to block the flow of fluid and isolate a section of the pipeline. The CPVC Blind Flange is a solid disk-shaped flange used to terminate or seal off the end of a CPVC piping system. Designed for durability, chemical resistance, and ease of installation, it provides a reliable and leak-proof closure for systems that may need future expansion, inspection, or modification.
CPVC blind flanges are commonly installed at the end of pipes, valves, or equipment connections to allow for future expansion, maintenance, or inspection of the piping system. They are widely used in chemical processing, water treatment, and industrial piping applications because CPVC offers excellent corrosion resistance, chemical resistance, and high temperature tolerance.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
CPVC Blind Flange Details
L – Flange Diameter
H – Height/Thickness
U – Number of Bolt Holes
| Size (Inch) | L (mm) | H (mm) | U (No. of Holes) |
| 1″ | 115 | 15 | 4 |
| 1½” | 136 | 18 | 4 |
| 2″ | 160 | 18 | 4 |
| 2½” | 176 | 23 | 4 |
| 3″ | 188 | 23 | 4 |
| 4″ | 225 | 28 | 8 |
| 6″ | 278 | 28 | 8 |
| Parameter | Details |
| Product Type | Blind Flange (Solid Flange) |
| Function | Seals the end of a pipeline or nozzle |
| Material | CPVC (Chlorinated Polyvinyl Chloride) |
| Size Range | DN 15 – DN 200 (½″ to 8″) |
| Pressure Rating | PN 6 – PN 10 (6–10 bar) |
| Temperature Range | 0°C to 90°C |
| Standards | ASTM F439, ANSI B16.5 (Class 150), DIN, BS |
| Face Type | Flat face (FF) |
| Drilling Pattern | As per ANSI / DIN standards |
| Connection Method | Bolted with gasket between mating flange |
| Base Material | CPVC (Chlorinated Polyvinyl Chloride) |
| Specific Gravity | ~1.45 – 1.55 |
| Tensile Strength | ~7000 psi |
| Flexural Strength | ~11,000 – 13,000 psi |
| Compressive Strength | ~9000 – 10,000 psi |
| Impact Strength | High (thermoplastic toughness) |
| Thermal Conductivity | Low (insulating properties) |
| Water Absorption | < 0.05% |
| Fire Rating | Self-extinguishing (UL 94 V-0) |
| Design | Solid circular plate without bore |
| Shape | Round with evenly spaced bolt holes |
| Weight | Lightweight compared to metal blind flanges |
| Surface Finish | Smooth, corrosion-free |
| Color | Grey / Ivory |
| Rigidity | Good structural strength for moderate pressure |
| Sealing | Requires gasket for leak-proof closure |
Reliable End Sealing
Blocks off the end of a piping system for maintenance, testing, or future expansion without fluid leakage.
Superior Chemical Resistance
Withstands exposure to acids, alkalis, and other harsh chemicals commonly found in industrial processes.
High-Temperature Tolerance
Performs effectively in systems operating up to 93°C (200°F), making it suitable for hot fluid handling.
Strong and Durable
Constructed from high-grade CPVC, offering excellent mechanical strength and long operational life.
Corrosion-Resistant
Non-metallic body resists rust, pitting, and scaling, even in aggressive environments.
Compatible with Standard CPVC Flanges
Fits easily with standard CPVC flange components for quick and secure installation.
Low Maintenance
Requires minimal upkeep over time due to its robust construction and chemical resistance.
| Nominal Size (DN / Inch) | Pressure Rating at 23°C (73°F) | Pressure Class |
| ½” – 2″ (DN15 – DN50) | Up to 16 bar | PN16 |
| 2½” – 4″ (DN65 – DN100) | Up to 16 bar | PN16 |
| 5″ – 8″ (DN125 – DN200) | Up to 10 – 16 bar | PN10 / PN16 |
| 10″ – 12″ (DN250 – DN300) | Up to 10 bar | PN10 |
| Above 12″ (DN350+) | 6 – 10 bar (design dependent) | PN6 / PN10 |
Temperature Derating for CPVC
| Temperature | Pressure Capacity |
| 23°C | 100% rated pressure |
| 40°C | ~75% of rated pressure |
| 60°C | ~50% of rated pressure |
| 80°C | ~25–30% of rated pressure |
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 CPVC Blind Flange
Excellent Corrosion Resistance
CPVC blind flanges resist corrosion from chemicals, acids, and alkalis, making them suitable for harsh industrial environments.
High Temperature Resistance
CPVC material can handle higher temperatures than standard PVC, making it suitable for hot water and chemical processing systems.
Leak-Proof Sealing
When used with proper gaskets and bolts, CPVC blind flanges provide a tight and reliable seal at the end of pipelines.
Lightweight Construction
Compared to metal blind flanges, CPVC blind flanges are lightweight, which makes transportation, handling, and installation easier.
Low Maintenance
Due to their corrosion and chemical resistance, CPVC blind flanges require minimal maintenance over time.
Long Service Life
They offer long durability in industrial piping systems because CPVC does not rust, scale, or degrade easily.
Easy Installation and Removal
The flange design allows easy installation and removal for inspection, maintenance, or future pipeline expansion.
Cost-Effective Solution
CPVC blind flanges are generally more economical than metal alternatives while still providing reliable performance in many applications.
Good Chemical Compatibility
Suitable for use in chemical plants, water treatment facilities, and industrial fluid handling systems.
Versatile Application
Commonly used in industries such as chemical processing, pharmaceuticals, water treatment, and industrial piping systems.
Types of CPVC Blind Flange
Standard CPVC Blind Flange
- A solid flange without a center hole is used to close the end of a pipeline
- Commonly used in standard CPVC piping systems for isolation or termination.
ANSI Standard CPVC Blind Flange
- Manufactured according to ANSI flange drilling standards.
- Ensures compatibility with ANSI flanged pipes and fittings.
PN Standard CPVC Blind Flange
- Designed according to PN (Pressure Nominal) standards such as PN10 or PN16.
- Widely used in industrial and water treatment piping systems.
Heavy Duty CPVC Blind Flange
- Thicker and stronger construction for high-pressure or heavy industrial applications.
- Provides extra durability and strength.
Light Duty CPVC Blind Flange
- Used in low-pressure or small-diameter piping systems.
- Lightweight and economical.
Raised Face CPVC Blind Flange
- Features a raised sealing surface to ensure better gasket sealing and leak prevention in flange joints.
Applications of CPVC Blind Flange
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
In modern piping engineering systems, CPVC Blind Flanges have become a standard feature in oil, gas treatment, chemical, and industrial fluid systems. Petron Thermoplast is a trusted manufacturer and supplier of CPVC Blind Flange designed for reliable flow control, corrosion resistance, and long-term performance in industrial and utility piping systems. Our CPVC Blind Flange combines quality materials, precision engineering, and practical design to meet diverse application needs.
