Product Overview
GRP (Glass Reinforced Plastic) sleeves are high-performance composite tubular products engineered specifically for joining pipes. Manufactured through precision filament winding technology, each GRP sleeve combines continuous glass fiber reinforcement, rubber seal with a thermosetting resin matrix (unsaturated or vinyl ester), delivering an optimal balance of high ring stiffness, lightweight handling, and long-term durability. The result is a protective solution that significantly outperforms traditional steel, cast iron, or concrete alternatives in service life, installation efficiency, and total cost of ownership. We manufacture 2 kinds of GRP sleeves called integrated coupling and coupling with full-faced elastomeric seal.
Key Material Advantages
Property
Performance Benefit
Corrosion Immunity
Inherently resistant to acids, alkalis, salts, and organic solvents-no cathodic protection or external coating required
High Strength-to-Weight Ratio
Approximately 1/2 of steel and 1/4 of concrete
Smooth Inner Surface
Low friction coefficient (Hazen-Williams C-value ≥ 150), minimizing flow restriction when used as a slip-liner
Electrical Insulation
Non-conductive-eliminates galvanic corrosion and stray current interference for enclosed metallic pipes
Design Life
50+ years with minimal maintenance
Our GRP sleeves
Sleeves manufactured by Zhejiang Huafeng New Material Co., Ltd.
integrated coupling
coupling with full-faced elastomeric seal
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