Abrasives & Sandpaper Manufacturers in India: Grit Guide

Eleven rolls sat in a godown in Sahibabad for almost a week because nobody wanted to say whose mistake it was. The unit made wardrobe doors. The owner had phoned around to a few sandpaper manufacturers India has no shortage of, and he took the cheapest rate. Nobody looked at the label when the rolls came in. They were 80 grit. The job needed 150.

I heard this from the purchase manager, a man who’d been buying abrasives for something like fifteen years. He wasn’t embarrassed about it. He was annoyed that a batch of doors had reached the paint line with scratches you could catch with a thumbnail.

Dealers in Delhi still clear old stock marked on one scale, while newer units label theirs on another. Up to about 100 the two sit close enough that nobody notices. Further up the numbers drift apart, and a 240 off one roll can feel like a 220 off the other.

The Sahibabad man now writes the scale on every purchase order, right beside the number. It costs him one extra line. Before that he’d had two lots of 320 finish differently on the same chair frames, and the carpenters blamed each other for a full day before somebody turned the rolls over and read them.

A shop near Meerut was stripping enamel off a few hundred steel almirahs for a resale order. The 40 grit took paint off in minutes, which pleased everybody. Then the supervisor, in a hurry, went straight to 220 because the metal looked clean enough.

Looked clean. Under primer, in daylight, every deep line from the coarse pass was still sitting there. The first batch went back. They redid it stepping up slowly, one grit at a time, and the second batch passed. He still brings it up whenever a new helper reaches for the fine paper too early.

A car panel shop in Noida bought a bundle of 800 grit for the wet work before clear coat. Dry sheets, as it turned out. The backing went soft after about twenty minutes in the bucket and left tiny lumps in the surface. Two panels were ruined before anyone worked out why.

They moved to silicon carbide paper sold for wet use. The owner says it cuts cured paint quickly. He’d never put it on a weld seam, where it dulls fast, and keeps a different paper for that.

A small brass unit I know of wanted emery paper for light polishing on turned shafts. The supplier quoted low. What arrived had the old name printed on the wrapper but cut far harder than the shafts could take, and a batch already close to size went out of tolerance.

Now the owner asks every one of the emery paper suppliers he calls what is actually on the sheet. One of them stopped picking up. That told him plenty.

A joinery workshop ordered paper-backed rolls to cut into belts for a wide belt machine. The belts tore inside an hour. Cloth was what the machine wanted. Nobody had written that on the order because the buyer assumed the supplier would ask, and the supplier assumed the buyer knew.

I’ve watched that exact exchange happen more than once, with different people each time. Heat and tension take paper apart. Film backing turns up where the scratch pattern has to be very even, fine automotive work mostly, and I wouldn’t pay for it on ordinary joinery. A waste.

Sixty steel gates for a housing project, in March, hot enough that the welders started at six. The shop was grinding welds with standard aluminium oxide flap discs and going through maybe four a gate. Each change stopped the line for a few minutes, which nobody counted until the foreman started complaining.

The owner tried zirconia discs on trial. They cost about a third more per piece. One lasted roughly a gate and a half, so the sums went something like this: four cheap discs at forty rupees or so is a hundred and sixty, against a gate and a half of the dearer ones at fifty-five, call it eighty. He didn’t work it out that neatly. He just noticed the foreman had stopped complaining.

The same project needed primer and hardware as well, and he spent one evening on a list ofbuilding and construction material suppliers instead of ringing his usual contacts one after another. He found two abrasives vendors he hadn’t heard of. One of them is who he buys from now.

Most buyers compare rate per sheet, and I think it’s a poor way to do it. A sheet that clogs in ten minutes on resinous timber costs more in labour than a dearer one that lasts the shift. Woodworkers in Saharanpur found this out on teak. Closed coat sheets loaded up so fast that carpenters were knocking the dust out against the bench every few minutes. Open coat cost a little more and ran most of the afternoon.

Nobody on that floor tracked sheets per job. They tracked the invoice. It’s a bit like buying tyres by the kilo of rubber.

The Sahibabad buyer started with directories and got a shortlist in one afternoon. He rang eight of them. Three could say what mineral was on the sheet, what backing it had and whether it was open or closed coat without checking with someone else. Those three stayed on the list.

I’d say that test is worth more than any price quote. A supplier who has to ask “which grit were you saying?” probably isn’t making the product, just passing it along. Traders are fine for some purchases, though for coated abrasives bought in volume he wanted to talk to someone who knew the line. When he later needed other site supplies, he went back to thisconstruction materials page and found more vendors in one sitting.

He asks for sample sheets in the exact grit, backing and size he uses. Some abrasive manufacturers sent them the same week. Others wanted an advance for samples, and he dropped those. One took three weeks and then sent the wrong grit, which settled that.

Then he runs the samples on his own machine for a full working day. A sheet that looks perfect on the bench can behave differently on the line, and he’s been caught by that once. I’d do the same. A lost day costs less than a lost lot. When the next order comes around he’ll probably start fromTIS Nexus again, since that’s where the last shortlist came from.

The 80 grit rolls are still in that Sahibabad godown. They go on the back panels of the cheaper wardrobes now, where nobody looks.