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CONPROOF No. 1
- ISI mark waterproofing liquid
- Waterproofing for sump construction
- Roof slab and terrace concrete
- Bathroom and toilet plaster
CONPROOF No. 1 is a Bureau of Indian Standards certified, ISI marked, high-power concentrated integral liquid waterproofing compound compliant with IS 2645. Added at just 100ml per 50kg bag of cement, it improves waterproofing, workability and cohesiveness of plaster and concrete mixes — reducing permeability, eliminating cracks and efflorescence, and improving bond strength between concrete and steel. Water-based, non-hazardous. For basements, roof slabs, screeds, water retaining structures, swimming pools, tanks, reservoirs, sumps, dams and canals.
Specifications
Figures are controlled laboratory results. Actual site performance varies with substrate, temperature, humidity, application method and workmanship — please confirm the current product datasheet before specification.
Where to use CONPROOF No. 1: ISI marked waterproofing compound for plaster and concrete
CONPROOF No. 1 is an ISI marked waterproofing compound, certified by the Bureau of Indian Standards and compliant with IS 2645. It is a water-based integral liquid that improves the waterproofing, workability and cohesiveness of plaster and concrete mixes. This BIS certified integral waterproofing liquid is stirred into the gauging water for each bag of cement.
Basements
Reduces the permeability of basement concrete and plaster.
Roof Slabs & Terraces
Mixed into slab concrete to reduce permeability from the start.
External Wall Plasters
Added to plaster mortar for efflorescence resistance.
Bathrooms & Toilets
Stirred into the gauging water for wet-area plaster and screed.
Balconies & Screeds
Improves workability and cohesiveness of the screed mix.
Swimming Pools
For water retaining concrete that needs low permeability.
Water Tanks & Reservoirs
Low water permeability for concrete that holds water.
Sumps
Added at 100 ml per bag when building the sump.
Dams & Canals
A free-flow mix with reduced bleeding and segregation.
Ready-Mix Concrete
Added to the transit mixer at site and rotated for 3–5 minutes.
To waterproof a new house during construction, the dosage is 100 ml per 50 kg bag of cement, so the 100 ml pack covers exactly one bag. Packs are 100 ml, 500 ml, 1 Ltr, 5 Ltr, 20 Ltr and 210 Ltrs, with a shelf life of 2 years. This waterproofing compound for sump and water tank work is BIS certified to IS 2645 and improves bond strength between concrete and steel. Add the liquid to the gauging water, stir well, then prepare the mix as usual.
Armstrong Chemicals supplies CONPROOF No. 1 to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
Why CONPROOF No. 1 works
ISI marked to IS 2645
It is Bureau of Indian Standards certified and compliant with IS 2645, which gives engineers a recognised standard to specify.
Small measured dose
Just 100 ml goes into the gauging water for each 50 kg bag of cement, so measuring on site is simple.
Better bond with steel
It improves bond strength between concrete and steel while reducing permeability and resisting efflorescence.
ISI Marked. 100ml Per Bag. IS 2645 Certified.
The Bureau of Indian Standards certified integral waterproofing compound — the simplest dosage in the Armstrong range, in the widest pack range.
Get a QuoteBureau of Indian Standards — IS 2645 · ISI Marked
The only Armstrong admixture explicitly BIS-certified and ISI marked to IS 2645 — the specification benchmark for CPWD, State PWD, government and infrastructure works.
100ml Per 50kg Bag — Lowest Dosage in the Range
A single 100ml pack covers exactly one 50kg bag of cement. 1 Litre covers 10 bags · 5 Litres covers 50 bags — economical for trials, repairs and full-scale pours alike.
From 100ml Trial to 210L Drum
The widest packing range in the Armstrong admixture family — the 100ml pack is unique to CONPROOF No. 1.
Trusted on India's Toughest Infrastructure
The Specification-Grade Standard
BIS-certified performance at the lowest dosage in the Armstrong admixture range.
IS 2645 · BIS Certified · ISI Marked
The only Armstrong admixture with Bureau of Indian Standards ISI certification — meeting the specification benchmark for government, CPWD and specification-grade works.
100ml Per 50kg Bag — Lowest Dosage
At just 100ml per bag of cement, one 1-litre bottle covers 10 bags of concrete — economical for both small repairs and large pours.
Plaster, Mortar & Concrete
Equally suitable for cement-sand plaster, structural concrete, screeds and ready-mix concrete in transit mixers — one product across the full range of cementitious applications.
CPWD & Government Infrastructure Approved
Tested, approved and used across CPWD, State PWDs, Irrigation, Housing Boards, Thermal/Hydel, Roads, Water Works and Railways.
How to Use
Measure 100ml of CONPROOF No. 1 per 50kg bag of cement
Add the liquid to the gauging water required for that bag of cement; stir well
Use this water to prepare the cement-sand mortar or concrete mix as usual
For RMC (transit mixer): add CONPROOF No. 1 to the transit mixer at the site, rotate 3–5 minutes, then unload
Applicable Areas
Packing & Shelf Life
Available in 100ml, 500ml, 1, 5, 20 & 210 Litre packs. The 100ml pack covers exactly one 50kg bag of cement — ideal for trial use. Shelf life 2 years from manufacture, stored cool and dry.
Health & Safety
Water-based and non-hazardous. Do not ingest. Wash off any skin or eye contact immediately with water.
ISI Marked — IS 2645 Certified
Bureau of Indian Standards certified and ISI marked to IS 2645 — the BIS quality certification for concrete admixtures, applicable for government, infrastructure and specification-grade projects.
Product Brochure
Download Technical Datasheet
Full specifications, application systems, layering guides, and coverage tables.
Frequently Asked Questions
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