PPH Blind Flange
A PPH (Polypropylene Homopolymer) Blind Flange is a solid flange without a central bore, used to close or seal the end of a pipeline, valve, or vessel opening. It is bolted to a matching flange with a gasket to provide a tight and leak-proof closure.The PPH Blind Flange is a solid disc-shaped fitting used to seal the end of a piping system or a nozzle on a pressure vessel, providing a tight and secure closure. Manufactured from Polypropylene Homopolymer (PPH), this blind flange offers superior resistance to corrosion, chemicals, and thermal stress, making it suitable for use in demanding industrial environments.
It is commonly used in chemical processing plants, water treatment systems, and industrial fluid networks, where durability and chemical compatibility are essential. The flange can be easily bolted and unbolted, allowing for inspection, maintenance, or system expansion. A PPH Blind Flange is a solid, corrosion-resistant flange used to seal the end of a piping system, ensuring a secure and leak-proof closure.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PPH 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 | Specification |
| Product Type | Blind Flange (Blanking Flange) |
| Material | PPH (Polypropylene Homopolymer) |
| Design | Solid disc (no central bore) |
| Connection Type | Bolted flange connection |
| Pressure Rating | PN10 / PN16 (depending on size & backing ring) |
| Max Working Pressure | Up to 10–16 bar |
| Temperature Range | 0°C to +100°C |
| Size Range | DN15 to DN300 (½” to 12”) |
| Standards | DIN 2501, ANSI B16.5, ISO 7005 |
| Manufacturing Method | Injection molded / machined |
| Compatibility | Used with backing ring & gasket |
| Application | Pipeline termination, isolation, tank nozzles |
| Outer Diameter (D) | As per flange standard |
| Thickness (T) | Depends on pressure rating (PN10/PN16) |
| Pitch Circle Diameter | Bolt hole circle (PCD) |
| Number of Holes | 4, 8, 12, etc. (depends on size) |
| Face Type | Flat Face (FF) |
| Structure | Solid, flat circular plate |
| Weight | Lightweight compared to metal flanges |
| Corrosion Resistance | Excellent (acids, alkalis, chemicals) |
| Sealing Method | Gasket between mating flanges |
| Thermal Stability | Suitable for elevated temperatures |
Leak-Proof Closure – Provides a reliable seal for isolating pipe sections.
Excellent Chemical Resistance – Resistant to aggressive acids, alkalis, and solvents.
Durable & Lightweight – Easy to install, reduces structural load on piping systems.
Corrosion-Free – Ideal for corrosive environments where metal flanges fail.
Reusable Design – Can be removed and reused for inspection or modifications.
Compatible with Standard Flanges – Matches with ANSI/DIN backing flanges.
Thermally Stable – Withstands elevated operating temperatures with no deformation.
| Parameter | Specification |
| Nominal Pressure Rating | PN10 (standard) |
| Maximum Working Pressure | Up to 10 bar (at 20°C) |
| Optional Rating | PN16 (limited sizes/designs) |
| Hydrostatic Test Pressure | ~15 bar (1.5 × PN10) |
| Temperature Effect | Pressure decreases as temperature increases |
| Applicable Standards | DIN, ISO, ANSI |
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 PPH Blind Flange
1. Excellent Corrosion Resistance
- Highly resistant to acids, alkalis, and aggressive chemicals
- Ideal for chemical processing and wastewater applications
2. Lightweight and Easy Handling
- Much lighter than metal flanges
- Simplifies installation, transportation, and maintenance
3. High Chemical Compatibility
- Suitable for a wide range of industrial fluids and corrosive media
- Does not react easily with most chemicals
4. Leak-Proof Sealing
- Provides tight and secure closure when used with proper gasket
- Prevents leakage and contamination
5. Low Maintenance
- Non-corrosive material reduces frequent replacement and maintenance costs
- Long service life
6. Thermal Resistance
- Can withstand moderately high temperatures (up to ~100°C)
- Maintains structural integrity under thermal stress
7. Cost-Effective Solution
- Lower cost compared to metallic blind flanges
- Reduces overall system cost in corrosive applications
8. Good Mechanical Strength
- Strong enough for medium pressure applications (PN10/PN16)
- Suitable for industrial use
9. Smooth Surface Finish
- Prevents scale formation and deposits
- Ensures better hygiene in fluid handling systems
10. Easy Installation & Removal
- Bolted connection allows quick assembly and disassembly
- Useful for maintenance or future pipeline expansion
Types of PPH Blind Flange
1. Based on Face Type (Sealing Surface)
a) Flat Face (FF) Blind Flange
- Completely flat sealing surface
- Used in low-pressure systems (PN10)
- Easy installation and economical
b) Raised Face (RF) Blind Flange
- Slight raised portion on sealing area
- Provides better gasket compression and tight sealing
- Suitable for medium pressure applications
2. Based on Construction / Design
Solid (Standard) Blind Flange
- Simple solid disc without bore
- Most commonly used for pipeline end closure
Reinforced Blind Flange
- Thicker or supported with backing ring
- Used in higher pressure systems (PN16)
Spectacle Blind (Figure-8 Type)
- Combination of solid disc + open ring
- Allows switching between open and closed flow without removing flange
3. Based on Material Construction
a) Full PPH Blind Flange
- Fully made of PPH
- Best for corrosive chemical applications
b) PPH-Coated Metal Blind Flange
- Metal core with PPH lining
- Combines strength + corrosion resistance
4. Based on Standards
a) DIN Standard Blind Flange
- As per DIN / EN standards
- Common in India and Europe
b) ANSI / ASME Blind Flange
- As per ANSI B16.5 (Class 150, 300, etc.)
c) ISO / BS Blind Flange
- Used for international compatibility
Applications of PPH 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?
When it comes to industrial-grade systems, the choice of the right manufacturer is as important as the material itself. Petron Thermoplast has earned a reputation as a trusted global leader in the field of PPH Blind Flange and industrial flow solutions. Our products are known for precision, performance, and durability, designed to meet the most demanding industry standards across the chemical and infrastructure sectors.
With so many options on the market, why should you trust Petron Thermoplast for your PPH Blind Flange needs? The answer lies in our commitment to quality, service, and understanding your unique challenges.
