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THERMOPLASTIC LINED FRP/GRP PIPES & FITTINGS
THERMOPLASTIC (HDPE / PP / PPH / UPVC / CPVC / PVDF / ECTFE / FEP / PFA) LINED FRP/GRP PIPES & FITTINGS
SREX Composites manufactures a full range of thermoplastic-lined FRP/GRP pipes and fittings engineered for high-performance fluid handling in corrosive, abrasive and chemically aggressive environments. These systems combine a seamless inner thermoplastic liner with a high-strength FRP/GRP structural shell, delivering unmatched corrosion resistance, mechanical durability and long operational life.
Our product range includes pipes, elbows, tees, reducers, flanges, stubends, puddle flanges, end caps, crosses, field-joint lamination systems and installation accessories, all manufactured to strict dimensional and quality standards.
Each thermoplastic liner is selected based on chemical and temperature compatibility:
- HDPE / PP – General chemical service, effluent, industrial wastewater
- PPH – High-temperature alkali service
- UPVC / CPVC – Strong chlorinated streams, acidic media
- PVDF – High-purity and aggressive chemical applications
- ECTFE / FEP / PFA – Premium fluoropolymer solutions for extreme corrosion and high temperatures
This dual-laminate construction allows our products to outperform steel, rubber-lined steel, and unlined FRP systems, especially in environments that demand zero corrosion and low maintenance.
Engineering & Construction
Our thermoplastic-lined FRP/GRP piping systems are manufactured with a multilayer architecture engineered for long-term structural stability:
1. Inner Thermoplastic Liner
The seamless liner forms a continuous corrosion barrier resistant to acids, caustics, chlorine-based compounds, solvents, oxidizers and high-purity process fluids. All liners are fusion-welded or butt-welded to ensure uniformity, leak-free performance and chemical compatibility throughout the network.
2. Reinforced FRP/GRP Structural Shell
The outer structure is produced using controlled filament winding and hand-layup techniques. This provides:
- High tensile and hoop strength
- Superior impact resistance
- Pressure class flexibility
- Excellent fatigue and stress-crack resistance
The combination creates a pipe system capable of handling high pressure, thermal expansion, mechanical loads, cyclic temperature variations and continuous exposure to aggressive media.
Technical Features & Performance Advantages
Corrosion-Free Fluid Handling
The thermoplastic liner protects against chemical attack, preventing permeation, blistering, scaling and buildup inside the pipe. This results in:
- Extended operating life
- Lower maintenance
- No internal corrosion damages
- Smooth internal bore for reduced friction loss
High Structural Strength
The FRP/GRP shell provides the load-bearing capability, making the pipeline suitable for buried, above ground and industrial installations.
Wide Chemical Compatibility
Each polymer is selected for targeted chemical resistance:
- HDPE/PP for industrial effluent, water and mild chemicals
- PPH for elevated temperature alkaline fluids
- UPVC/CPVC for chlorinated or acidic service
- PVDF for ultra-pure and aggressive fluids
- ECTFE, FEP and PFA for extreme corrosion environments.
Lightweight & Easy Installation
Compared to steel or alloy pipelines, our systems offer simpler handling, faster installation and lower logistics costs.
Smooth Internal Surface
Low friction factor ensures better hydraulic efficiency and stable flow rates even in long pipeline networks.
Leak-Proof Jointing Options
Thermoplastic welding and FRP over-lamination provide reliable, long-life joint systems.
Applications
Our systems are used across:
- Chemical and petrochemical plants
- Fertilizer and agro-chemical industries
- Acid and alkali transfer lines
- Chlor-alkali units
- Water & wastewater treatment plants
- Power plants & cooling water circuits
- Desalination plants
- Mining and metal processing
- Battery, electronics and semiconductor industry (PVDF / PFA / FEP)
- High-purity fluid transfer
These industries prefer thermoplastic-lined FRP/GRP piping due to its combination of corrosion resistance, structural strength and low lifecycle cost.
Product Range (Common Description for All Items)
SREX Composites manufactures a complete assortment of pipes and fittings in all thermoplastic lining options. The product range includes 90° and 45° elbows, equal and unequal tees, reducers (concentric and eccentric), flanges, stubends, puddle flanges, crosses, end caps, bends, lamination kits and installation accessories.
All components maintain uniform tolerances, smooth internal surfaces, precise alignment and weld-ready ends for thermoplastic joining. Regardless of the size, shape or flow direction, each item retains the same chemical resistance as the base liner and the mechanical strength of the FRP/GRP outer shell.
These fittings integrate seamlessly into any process pipeline, offering leak-proof, corrosion-resistant and mechanically stable connections suitable for diverse industrial conditions.
Design Standards & Certifications
Our thermoplastic-lined FRP/GRP systems conform to global engineering codes such as:
- ISO 14692 – Design, manufacturing and installation requirements
- ASTM D2992 / D2996 / D2310 – Filament-wound reinforced plastic pipe classification
- ASTM D1599 / D2412 – Pressure and deflection testing
- DIN 16965 / 16966 – German standards for GRP piping
- BS 7159 – British specification for GRP components
- IS 14402 / IS 12709 – Indian standards for GRP pipelines
- ASME RTP-1 (where applicable)
This ensures structural integrity, dimensional accuracy, pressure performance and long-term operational reliability.
Quality Assurance
Every pipe and fitting undergoes:
- Liner inspection and spark testing
- Dimensional checks
- Hydrostatic pressure testing
- Visual and structural FRP laminate inspection
- Adhesion verification
- Documentation, traceability and compliance reporting
SREX Composites follows a stringent quality management system ensuring all supplied materials meet or exceed project specifications.
Why Choose SREX Composites for Thermoplastic-Lined FRP/GRP Systems
- Complete range of liners: HDPE, PP, PPH, UPVC, CPVC, PVDF, ECTFE, FEP, PFA
- Custom manufacturing for any size and pressure class
- Lightweight, high-strength structural design
- Corrosion-free performance with zero maintenance
- Excellent hydraulic efficiency
- Superior chemical and temperature resistance
- Lower installation and lifecycle cost compared to metals
- On-site technical support, installation guidance & lamination teams
Conclusion
SREX Composites delivers engineered thermoplastic-lined FRP/GRP piping systems designed to provide long-term reliability in the most corrosive and demanding operating conditions. With strong mechanical performance, outstanding chemical resistance, and world-class quality assurance, our products ensure a durable, cost-efficient and trouble-free pipeline solution for every industrial sector.
Get More Details
Have a question about our FRP/GRP products? Need a custom solution or technical recommendation? Fill out the form below, and our engineering team will reach out with precise information tailored to your requirements.
We are here to serve you.
We’re here to support you with reliable FRP/GRP solutions engineered for industrial excellence. Whether you need technical guidance, custom manufacturing, quotations, or project collaboration — our team is ready to assist you.
+91 70431 70434
marketing@srexcomposites.com
Plot No. 27, Shri Hari Industrial Park, Sokhada, Rajkot, Gujarat, India – 360003