Help: Need some #600 grit for making ground glass...

[Denis P.]

Hi,

I'm trying to make a (better) ground glass for an old 4x5 reducing back I have, but I'm not quite happy with the results, compared to my other 4x5 camera (Horseman Woodman).
It seems the grinding powder I have is too coarse...

Now, I've checked locally for suitable silicon carbide (?), but all the suppliers I contacted sell minimum quantities which are waaaay too big (and expensive) for me. I've also checked online in USA and elsewhere, and managed to find a few sellers, but the shipping costs to Croatia are really expensive (orders of magnitude more expensive than the product itself...).

So, I'm asking other DIY types here: perhaps someone has some #600 grit silicon carbide that they would be willing to ship to Croatia? I need a relatively small quantity (enough to make several GGs), which would most likely fit into a standard-size envelope (3-4 ounces, i.e. about 0.1 kg at the most should be more than enough, I guess...).

Of course, I'm willing to pay for the material and shipping - and I suppose the shipping should be much less than the standard $45-$50 the online sellers are asking

I'm not sure why they charge so much for shipping: perhaps the silicon carbide requires some special forms to be filled or something? It's not as if it's a hazardous substance, AFAIK....

Thanks in advance,

Denis

[E. von Hoegh]

http://www.mcmaster.com/#polishing-compounds/=l5borg

[Denis P.]

http://www.mcmaster.com/#polishing-compounds/=l5borg

Thanks, but I'm generally wary of web sites which require me to register just to be able to see what they offer.
Even after registering, all I was able to see was a spinning circle....
So, thanks, but that didn't help.

[jeffreyg]

Denis,

I'm not sure how you intend to get an even abrasion but you might consider a dental supply or your dentist for pumice, carborunduim or aluminum oxide powders which should be available in different degrees of coarseness. There are airbrushes that are designed to spray abrasives as well. Glass can also be etched with hydrofluoric acid.

http://www.jeffreyglasser.com/

[E. von Hoegh]

Thanks, but I'm generally wary of web sites which require me to register just to be able to see what they offer.
Even after registering, all I was able to see was a spinning circle....
So, thanks, but that didn't help.

Register? Something is wrong, there is no registration neccesary. McMaster Carr is an industrial supply company, I've been buying from them since the late 80s.
Clicking on the link I posted should take you directly to the abrasives section of their online catalog.

[Denis P.]

Register? Something is wrong, there is no registration neccesary.

Perhaps they have a different policy for overseas visitors?
Besides, I'm using Linux, and my browser is definitely NOT IE... This sometimes poses problems with IE-optimized sites. Nevermind - thanks for the suggestion.

Anyway, I've got some other suggestions, particularly from Ian, so I might be able to get some from ebay, after all - I managed to find some sellers who do not charge an arm and a leg for shipping
My initial search was rather restricted somehow, chaning search terms on ebay yielded more results, so I might find something there, after all.

Thanks everyone for the suggestions!

[mgb74]

Try some rock polishing grit. Comes in various grit fineness.

But loose powder in an envelope probably not a good idea, given biohazard concerns. A bit in a film canister or sealed plastic envelope shouldn't be an issue.

[NormanV]

Try this supplier on Ebay item number 251208546401. I have bought from them, they supply worldwide.

[oldlincoln]

This is re-packaged Clover compound. the grease base helps the cutting and washes away with soap and water.
[URL="http://www.midwayusa.com/product/498161/wheeler-engineering-lapping-compound-600-grit-polishing-1-oz"]

[Whiteymorange]

Hi Denis,
I've bought grit from Gotgrit.com and was quite pleased with the service. I don't know about overseas shipping.

Good luck!