SIKA · AUTHORIZED PROJECT DISTRIBUTOR · SPACE ARC ENGINEERING
SikaProof-312 HDPE SG W IN
Pre-applied, fully bonded HDPE sheet membrane (W variant) for below-ground waterproofing
Product Overview
SikaProof-312 HDPE SG W IN is a pre-applied, fully bonded waterproofing sheet built around a virgin high-density polyethylene core, a high-bond pressure-sensitive adhesive and a protective sand-sprinkled face. Installers loose-lay the sheet over a prepared blinding or formwork before placing reinforcement; when concrete is cast, the adhesive activates and forms a permanent mechanical bond to the hardened slab. Because the membrane is integrally bonded, water cannot track laterally between sheet and structure even if a localised defect occurs. It is specified for basements, subways, tunnels, base slabs, walls and footings exposed to aggressive groundwater. Space Arc Engineering, an authorized Sika project distributor in India, supplies this membrane with technical guidance to infrastructure, industrial and commercial project teams.
Features & Benefits
- Pre-applied beneath the slab, so no excavation-side access is needed after casting
- Bonds intimately to fresh concrete, eliminating lateral water seepage paths
- Virgin HDPE core delivers long service life and resistance to aggressive groundwater
- High elongation (>500%) bridges shrinkage cracks and accommodates settlement
- Heat-weldable selvedge edges create continuous, reliable lap joints
- Chlorine-, plasticizer- and phthalate-free composition for cleaner construction
Technical Highlights
| Coverage | Supplied in 20 m rolls at 1.2 m, 1.5 m or 2.0 m width; plan laps and overlaps per the TDS when calculating area. |
| Strength | Tensile strength >=25 MPa with puncture resistance of 1000 +/- 50 N for robust handling on site. |
| Performance | Withstands a hydrostatic head greater than 71 m and bonds in peel at >=1500 N/m after 7 days. |
| Application Conditions | Apply between +5 C and +40 C ambient and substrate; concrete must be cast within 45 days of installation. |
| Packaging | Virgin-HDPE composite membrane, effective thickness >1.5 mm, supplied in standard rolls. |
Applications
- Metro and subway tunnel base slabs subject to high water tables
- Industrial plant deep basements and equipment pits
- Commercial tower raft foundations and retaining walls
- Residential basement floors and footings below the water table
- Infrastructure box culverts and underground service galleries
SPACE ARC ENGINEERING · AUTHORIZED DISTRIBUTOR
Product image & sample available on request
Technical Data
| Type | Pre-applied, fully bonded HDPE sheet membrane |
| Base | Virgin HDPE with pressure-sensitive adhesive and sand topping |
| Effective thickness | >1.5 mm composite |
| Tensile strength | >=25 MPa, elongation >500% |
| Roll size | 20 m length; 1.2 / 1.5 / 2.0 m width |
| Application temp. | +5 C to +40 C |
Datasheet & Documents
Request the Technical Data Sheet, method statement and safety data sheet from Space Arc Engineering.
Request Quote / Availability
+91 9999155255
+91 7290089007
info@space-arc.com
Frequently Asked Questions
What is SikaProof-312 HDPE SG W IN used for?
It is a pre-applied, fully bonded HDPE membrane for below-ground waterproofing of base slabs, walls and footings in basements, subways and tunnels exposed to groundwater.
How does a pre-applied membrane bond to concrete?
The sheet is laid adhesive-side up before casting; when fresh concrete is poured over it, the pressure-sensitive adhesive and sand layer create a permanent mechanical bond, preventing water from migrating between the membrane and the structure.
What hydrostatic pressure can it resist?
The membrane withstands a hydrostatic head greater than 71 m. Always confirm project-specific values against the current TDS.
Within how long must concrete be placed after installation?
Concrete should be cast within 45 days of laying the membrane, and installation should be carried out between +5 C and +40 C.
Who supplies SikaProof-312 HDPE SG W IN in India?
Space Arc Engineering is an authorized Sika distributor in India. Contact +91 9999155255 or info@space-arc.com for pricing, availability and project support.
Related Products
- SikaProof-312 HDPE SG IN — Standard 312 variant of the same pre-applied HDPE membrane family.
- SikaProof-315 HDPE SG W IN — Thicker W-variant membrane for more demanding waterproofing duties.
- SikaSwell A — Swellable acrylic profile to seal construction joints within the same waterproofing system.
- Sikadur-Combiflex Adhesive IN — Companion adhesive for sealing detailing and joint bridging.
Buy SikaProof-312 HDPE SG W IN — Sika Distributor in India
Space Arc Engineering is an Authorized Project Distributor supplying Sika products for infrastructure, industrial, commercial and residential projects across India.
+91 9999155255 | +91 7290089007 | info@space-arc.com
Related waterproofing products
Other waterproofing systems we supply & apply across Delhi NCR and pan-India.