Sika SikaWrap-430 G
Unidirectional E-glass fibre fabric for non-conductive strengthening and seismic retrofit of concrete and masonry, epoxy-bonded on site.
What is it?
A dry, unidirectional woven E-glass fibre fabric (430 g/m2) that becomes a structural GFRP laminate once impregnated with a Sikadur epoxy resin on site.
Where is it used?
Columns, beams, slabs and masonry walls needing added load capacity or seismic confinement, especially where a non-conductive wrap is required near electrical or sensitive installations.
Why use it?
Adds tensile and confinement strength without altering member size or adding meaningful dead load, and its glass fibre stays electrically insulating unlike carbon.
How is it applied?
The concrete is primed and levelled, epoxy saturant is applied, the fabric is laid along the fibre direction and rolled through, then a second resin coat is applied to fully wet out the fibres.
About Sika SikaWrap-430 G
SikaWrap-430 G is Sika’s unidirectional woven glass fibre fabric for on-site structural strengthening. The fibres run in a single (0 degree) direction and carry the load, while a light weft thread simply holds them in place during handling. On its own the fabric does nothing structural; it becomes a load-bearing element only after it is saturated with a Sikadur epoxy, which binds the fibres together and bonds the finished laminate to the substrate. This wet lay-up approach means the reinforcement is formed and cured in position, so it wraps tightly around columns, follows beam soffits and hugs irregular masonry without the tolerances a bonded plate would demand.\n\nWhat sets the glass version apart from carbon wraps is that E-glass is electrically non-conductive. That makes SikaWrap-430 G the sensible choice around substations, switchrooms, hospitals with sensitive equipment and any location where an electrically inert strengthening system is specified. It is also a cost-effective route where the required strength gain is moderate and the extreme stiffness of carbon is not needed. As an authorised Sika distributor and applicator across Delhi NCR and Pan-India, Space Arc supplies the fabric together with the matching Sikadur saturants and the surface-preparation products that make the system work as designed.
The technical insight
A strengthening wrap works by externally bonded reinforcement: the concrete or masonry keeps carrying compression, and the thin fibre laminate takes the tension or provides confinement that the original section lacked. SikaWrap-430 G supplies that tension capacity through E-glass rovings aligned in one direction, with a dry fibre tensile strength of about 2,500 N/mm2 and a modulus around 72,000 N/mm2. Because the fibres are unidirectional, the installer orients the fabric deliberately: along the span for flexural strengthening, transverse for shear, or in the hoop direction for column confinement. The epoxy saturant is not a glue in the ordinary sense; it is the matrix that transfers stress into every filament and shears load out to the substrate, which is why full wet-out and a sound, primed surface matter far more than simply sticking the sheet down. The dry fabric is only 0.168 mm thick, so several layers can be built up to reach a target capacity while adding almost nothing to the member’s dimensions or self-weight.
Where it is used
- Flexural strengthening of RCC beams and slabs by bonding fabric to the tension face along the span
- Shear strengthening of beams using transverse or U-wrap fibre orientation
- Confinement wrapping of columns to raise axial capacity and ductility
- Seismic retrofit and confinement of masonry and concrete elements
- Non-conductive strengthening near substations, switchrooms and hospitals where an electrically inert wrap is required
- Refurbishment of marine and corrosion-affected structures
- Upgrading walls and slabs for increased or changed live loads
- Impact and blast mitigation upgrades to existing members
Key advantages
- E-glass fibres are electrically non-conductive, suiting sensitive and electrical environments
- Adds tensile and confinement strength with negligible change to member size or dead load
- Wet lay-up conforms to columns, soffits and irregular masonry without tight fit-up tolerances
- Unidirectional fibres let the designer place strength exactly where the demand is
- Lower material cost than carbon where the required strength gain is moderate
- Thin 0.168 mm dry fabric allows multiple layers to reach a target capacity
- Corrosion-free reinforcement, unlike added steel
- Supplied with matched Sikadur saturants and primers as a single engineered system
Limitations & considerations
- Structural performance depends entirely on correct epoxy saturation and full fibre wet-out
- Glass fibre has lower stiffness than carbon, so it is less suited to deflection-critical or very high-load upgrades
- Requires a sound, prepared and primed substrate; strengthening a weak or delaminated surface will fail at the bond
- Epoxy application is temperature and humidity sensitive and needs trained applicators
- The exposed laminate needs a protective topcoat for UV and long-term durability
- Design capacity must be established by a qualified structural engineer, not read off the fabric alone
Selection & best practice
Start with the substrate: repair spalls and cracks, remove laitance and grind back to sound concrete, round off sharp column corners to a minimum radius so fibres are not kinked, and prime the surface. For the standard dry lay-up, apply Sikadur-330 as the impregnating resin, then lay the fabric strictly along its unidirectional axis and roll firmly in the fibre direction to drive out air and pull resin through the weave. Apply a second resin coat to complete wet-out; for additional layers, place them wet-on-wet where the datasheet allows. Budget roughly 1.2-1.6 kg/m2 of resin for the first layer and about 1.0 kg/m2 for each further layer, and confirm quantities against the current Sikadur TDS. Protect exposed laminates with a topcoat, and cure at the resin’s specified temperature range. Because outcomes hinge on workmanship, this system should be installed by an experienced applicator working to a stamped design.
Specifications
| Fibre type | Unidirectional woven E-glass (electrically non-conductive) |
| Fibre orientation | 0 degree (longitudinal) |
| Areal weight | 430 g/m2 (+/- 10 g/m2), fibres only |
| Dry fabric thickness | 0.168 mm |
| Dry fibre tensile strength | approx. 2,500 N/mm2 |
| Dry fibre tensile modulus | approx. 72,000 N/mm2 |
| Elongation at break | approx. 2.7% |
| Roll size | 600 mm wide x 50 m long |
| Saturating resin | Sikadur-330 (dry lay-up) / Sikadur-300 (wet lay-up) |
Industry use cases
Commercial and residential retrofit
Strengthening beams, slabs and columns when floors are re-purposed for heavier loads or added storeys.
Power and industrial
Non-conductive confinement and strengthening around substations, switchrooms and plant where a carbon wrap is unacceptable.
Healthcare and sensitive facilities
Electrically inert strengthening in hospitals and labs with sensitive equipment.
Heritage and masonry
Seismic confinement and repair of masonry walls and arches without heavy intervention.
Marine and coastal
Refurbishing corrosion-affected concrete where a corrosion-free reinforcement is essential.
Frequently asked questions
Is SikaWrap-430 G glass or carbon fibre?
Which resin do I use with it?
How much resin will I need?
How many layers can be applied?
Can I install it myself?
What roll size is supplied?
How we position Sika SikaWrap-430 G
SikaWrap-430 G sits in Sika’s structural strengthening family as the non-conductive, glass-fibre option. Where a project needs the far higher stiffness of carbon, step up to SikaWrap-230 C, paired with the same Sikadur-330 saturant. For plate bonding rather than fabric wrap, Sika CarboDur S laminates bonded with Sikadur-30 are the alternative approach. The system also relies on correct substrate preparation, where SikaTop Armatec-110 EpoCem serves as a bonding and reinforcement-protection coat, and on anchoring products such as Sika AnchorFix-3030 for end anchorage details. From our wider portfolio, Fosroc offers a directly comparable epoxy-bonded glass fibre system for specifiers standardised on that brand.
Fosroc Nitowrap GW — A specifier standardised on Fosroc, or already using Nitowrap epoxy saturants on site, can choose the equivalent unidirectional E-glass fabric for the same non-conductive strengthening role.
Related Structural Strengthening products
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.