Nitowrap GW
Glass Fibre Reinforced Polymer Wrap for Concrete Structural Strengthening
Authorized Project Distributor — Fosroc India | Space Arc Engineering, Ghaziabad
Product Overview
Nitowrap GW is a unidirectional woven glass fibre reinforced polymer (GFRP) fabric from Fosroc designed for externally bonded reinforcement (EBR) of existing reinforced concrete structures that need additional structural capacity due to change of use, increased loading, seismic upgrading, or repair of damage. The glass fibre fabric is saturated with Nitowrap EP structural epoxy resin during application and bonded to the prepared concrete surface, where it cures to form a high-strength composite laminate that acts in parallel with the existing concrete and reinforcing steel to carry the additional structural load. Glass fibre (GFRP) is the more economical option in the Nitowrap FRP range compared to carbon fibre (CFRP, supplied as Nitowrap CF). While GFRP has lower tensile modulus and strength than CFRP, it provides a practical and cost-effective solution for applications where the required additional capacity is moderate, such as column confinement for ductility enhancement in seismic zones, shear strengthening of beams and walls, and flexural strengthening of slabs and beams where the additional moment requirement is not very large. The structural performance of the Nitowrap GW system depends on the specific application, the design loading, the number of layers of fabric, and the properties of the substrate — all strengthening designs must be performed by a qualified structural engineer using the relevant code (ACI 440, ISIS Canada, fib Bulletin 14, or equivalent Indian standard). Space Arc Engineering distributes Nitowrap GW for seismic retrofit, change-of-use strengthening, and structural repair projects across Delhi NCR, Ghaziabad, and Northern India.
Applications
- Column confinement for ductility and seismic resistance improvement
- Shear strengthening of reinforced concrete beams and walls
- Flexural strengthening of slabs for increased loading capacity
- Pier and pile confinement in bridges and elevated structures
- Strengthening of concrete structures for change of use or additional floors
- Seismic retrofit of non-ductile concrete frames and walls
Key Advantages
- Glass fibre FRP — cost-effective alternative to CFRP for moderate strengthening
- High tensile strength in the fibre direction for efficient load transfer
- Applied externally without reducing building headroom or increasing section size
- No heavy formwork or shoring required during installation
- Compatible with Nitowrap EP structural epoxy saturant
- Part of the complete Fosroc Nitowrap FRP strengthening system
Technical Data
| Type | Unidirectional woven glass fibre FRP fabric (GFRP) |
| Fibre Type | E-glass (electrical grade glass fibre) |
| Orientation | Unidirectional (primary strength in fibre direction) |
| Tensile Strength (fibre) | Greater than 2000 MPa (typical, dry fibre) |
| Tensile Modulus | 70–80 GPa (typical, dry fibre) |
| Saturant Resin | Nitowrap EP structural epoxy (applied during installation) |
Get a Quote
📞 +91 9999155255
📧 info@space-arc.com
🏢 Space Arc Engineering, Sahibabad, Ghaziabad
Frequently Asked Questions
When should I specify Nitowrap GW (glass fibre) versus Nitowrap CF (carbon fibre) for concrete strengthening?
The choice between glass fibre (Nitowrap GW) and carbon fibre (Nitowrap CF) depends on the structural demand, the available space, and the project budget. Carbon fibre has approximately 3 to 4 times the tensile modulus and higher tensile strength than E-glass fibre, so it achieves higher strengthening effect per unit thickness and per unit width of laminate. Carbon fibre is preferred for flexural strengthening where high stiffness is needed to limit deflection, for very high load increase requirements, and where the number of fibre layers must be minimised for aesthetic or geometric reasons. Glass fibre is adequate and more economical for column confinement, shear strengthening, and moderate load increases where the higher stiffness of CFRP is not critical. A structural engineer should determine which is appropriate for the specific project.
Does the Nitowrap GW system require special surface preparation of the concrete?
Yes. The concrete substrate must be prepared to a high standard before applying Nitowrap GW. The surface must be ground or shot-blasted to expose clean aggregate, with all carbonated, contaminated, loose, or weak concrete removed. The surface must be dry and free of dust. Any cracks deeper than the cover zone must be repaired before strengthening (typically by injection with Nitofill UR63 or equivalent). The concrete must have a minimum tensile strength (typically pull-off strength greater than 1.5 MPa) for the FRP composite to be effective — if the concrete is too weak, the bond will fail in the substrate rather than loading the FRP laminate. The Nitowrap EP primer is applied to the prepared surface before the fabric.
Can the Nitowrap GW system be applied in wet or humid conditions?
The Nitowrap EP epoxy saturant resin requires a clean, dry substrate for effective bonding. The fabric should not be applied in rain, and the substrate must be dry at the time of application. High humidity (above 85% RH) can extend the cure time and in some cases reduce the ultimate bond strength. In India, the monsoon period (June to September) requires that FRP strengthening work be done under cover (dry area) or planned for the drier months. If application in humid conditions is unavoidable, consult Fosroc technical support and Space Arc Engineering for guidance on moisture-tolerant primer systems and application procedures.
Source Nitowrap GW for Your Project
Space Arc Engineering is an Authorized Project Distributor for Fosroc India serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
Get Nitowrap GW — Glass Fibre Reinforced Polymer Wrap for Concrete Structural Strengthening — pricing, TDS & technical help
Space Arc Engineering is an authorized Fosroc distributor & applicator in Delhi NCR & pan-India. Fast quotes, datasheets and on-site support.
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