Why the distinction blurs on a tarpaulin
A laminated woven sheet can be genuinely impermeable across its face and still let water through the assembly — at a stitched seam, at an eyelet punched through the fabric, along a fold that has been creased repeatedly, or wherever standing water sits under pressure for hours. The fabric and the finished cover are two different things, and most real-world leaks are a property of the second.
That is why a cover can be accurately described as waterproof and still leave the goods underneath damp. Pooling, condensation and moisture rising from the ground all produce wet cargo under an intact sheet.
What to ask a supplier
Which test method?
A named method — hydrostatic head, or a defined internal procedure — means something. An unqualified adjective does not.
Tested on fabric or on a finished sheet?
Fabric-level results say nothing about seams and eyelets, which is where finished covers usually leak.
Under what conditions?
Brief exposure and sustained standing water are different tests with different results.
What is the tolerance across a production run?
A result from one sample is not a guarantee across a batch.
Where Double Kissan stands on this
Our sheets are laminated woven HDPE, and lamination is what gives the surface its water-shedding behaviour. The formal waterproof classification for each GSM, and the test method behind it, are confirmed with our factory before we publish them — this page will not assert a rating ahead of that, because an unverified claim is worth less than an honest answer, particularly to the procurement buyers and answer engines that check.
What we publish once confirmed
Waterproof classification by GSM, the test method used, and whether results are measured at fabric or finished-sheet level will be published here, per GSM, once the factory has confirmed each one with its method named.
Practical steps that matter more than the label
Never let water pool
Standing water finds its way through assemblies that shed running water perfectly. Slope every cover.
Keep fixings above the water line
An eyelet below a running water path is an entry point regardless of the fabric rating.
Address moisture from below
Damp ground under a covered stack produces wet goods under a perfectly intact sheet.
Allow air movement
A completely sealed cover traps condensation against whatever it protects.
Written by the Double Kissan team at Ashoka Poly Laminators Pvt. Ltd., Bareilly. Last reviewed November 2026.