50g/m² Chemical-Resistant Glass Fiber Mat for Smooth Corrosion Barrier Linings in Glass Reinforced Epoxy (GRE) Pipe and Vessel Filament Winding
2026-11-11 16:07
1. Technical Overview
SAST50 is a wet-laid, non-woven fiberglass surface tissue engineered for continuous filament winding and hand lay-up of GRE (Glass-Reinforced Epoxy) products.
We manufacture this dense fiberglass tissue as an essential resin-rich surface veil that creates a smooth, crack-resistant inner liner inside chemical pipes, storage tanks, and offshore high-pressure lines.
The 50g/m² matrix features rapid epoxy penetration to ensure zero micro-voids, trapping liquid epoxy to form a robust corrosion barrier.
Filament winding plants integrate SAST50 directly onto rotating mandrels to prevent fiber show-through, eliminate micro-cracking under cyclic pressure, and protect load-bearing structural glass layers from aggressive chemical attack.
2. Technical Specifications Table (TDS)
| Technical Parameter | Metric Value | Test Standard | Workshop Function & Purpose |
| Unit Weight (Grammage) | 50 g/m² (±5%) | ISO 3374 | Controls exact fiberglass tissue mass to ensure a consistent 90:10 resin-to-glass ratio in the inner liner. |
| LOI | ≤ 10% | ISO 1887 | Low organic binder formulation guarantees chemical compatibility with anhydride and amine epoxy hardeners |
| MD Tensile Strength | ≥ 120 N/50mm | ISO 3342 | Prevents web stretching and line snaps under high tension during automated mandrel winding |
| Epoxy Penetrating Time | ≤30 (2 layer) | ISO 15039 | Ensures instant, total resin wet-out on fast-winding Mandrels, preventing air entrapment and dry spots |
| Moisture Content | ≤ 0.5% | ISO 3344 | Prevents amine binder poisoning and steam blistering during high-temperature post-curing ovens (>150°C) |
3. Key Features & Workshop Problem Solvers
Rapid Resin Wet-Out Prevents Micro-Voids and Delamination
Dry spots in surface veils create internal voids that allow corrosive chemicals to breach the lining. SAST50 fiberglass surface tissue achieves total epoxy resin impregnation in ≤30 (2 layer). The rapid wet-out ensures complete air release during winding, forming a dense, seamless resin-rich barrier that halts fluid pinhole leaks.
Creates a Smooth, Low-Friction Inner Liner in GRE Pipes
Bare structural glass roving leaves rough, exposed fibers on pipe inner walls, increasing fluid friction and promoting scale buildup. SAST50 fiberglass tissue holds a uniform resin layer on the mandrel surface. It produces a mirror-smooth internal pipe finish that lowers flow resistance and extends piping system service life.
High Mandrel Winding Tensile Strength Eliminates Web Snaps
Fragile veils tear easily under automated tension on high-speed continuous filament winding machines, stopping the line and ruining the pipe lay-up. SAST50 delivers longitudinal tensile strength of ≥ 120 N/50mm. This pull strength ensures clean, uninterrupted winding around tight elbows, reducers, and straight pipe mandrels.
4. Target Applications & Processing Lines
Glass Reinforced Epoxy (GRE) Filament-Wound Piping
Pipe manufacturing plants wind SAST50 fiberglass surface tissue as the first inner liner layer directly onto rotating steel mandrels. The fiberglass tissue absorbs liquid epoxy resin, forming a leak-proof chemical barrier for high-pressure oilfield flowlines, ballast water pipes, and chemical transmission systems.
GRE/GRP Chemical Storage Tanks and Pressure Vessels
SAST50 functions as the primary corrosion-resistant veil for the inner corrosion liner of FRP/GRE storage tanks, scrubber towers, and process vessels. The fiberglass surface tissue protects structural filament-wound glass roving against acid, alkali, and hydrocarbon attack.
5. Frequently Asked Questions (Technical FAQ)
Q: How does SAST50 fiberglass surface tissue improve corrosion resistance in GRE pipes?
A: SAST50 has a resin-rich ratio (up to 90% resin by weight) on the inner surface of the pipe. Embedded in the epoxy matrix, the fiberglass surface tissue prevents resin cracking and stops corrosive media from reaching the structural glass fibers.
Q: Is SAST50 compatible with both amine-cured and anhydride-cured epoxy systems?
A: Yes. SAST50 fiberglass tissue uses a specialized silane-based binder chemistry designed specifically for epoxy systems. It wets out rapidly without altering resin curing kinetics or causing binder rejection.
Q: Why is low moisture content (≤ 0.5%) critical for SAST50 in GRE pipe winding?
A: Excess moisture in glass veils reacts with epoxy hardeners, causing incomplete curing, cloudiness, and steam blisters during oven post-curing. SAST50 is delivered factory-sealed at ≤ 0.5% moisture content to ensure defect-free, crystal-clear epoxy liners.
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