Raw black rubber

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Raw black rubber

This topic has 33 replies, 22 voices, and was last updated 2 September 2017 at 18:48 by Hacksaw.

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30 August 2017 at 17:44 #314573
Hacksaw
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@hacksaw
I don't suppose anyone knows where i could buy say a kilo or 2 of raw black rubber ? . I hope to vulcanize it myself in my own mold , in the oven, when my wife is out…Does it ( raw ) have a shelf life , does it dry out , do you keep it wrapped ?? Baines rubber is near me , I'm sure they use it , but the jobsworth on the counter is negative about selling me a bit !
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30 August 2017 at 17:44 #34359
Hacksaw
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@hacksaw
30 August 2017 at 17:50 #314576
not done it yet
Participant
@notdoneityet
Fort Dunlop? Oh, maybe not!
30 August 2017 at 19:30 #314600
mark smith 20
Participant
@marksmith20
I don`t think there such a thing as raw black rubber ,its latex which is a milky colour.Or dried latex dissolved in solvent To get the black stuff its mixed with carbon black pigment and sulphur plus other things.

I assume you might have been watching that bbc4 programme about plastics????

Your house would stink to helI. I have a large container of latex which stinks of ammonia . The ammonia is added to keep it in an emulified state but shelf life is limited.

Edited By mark smith 20 on 30/08/2017 19:32:18
30 August 2017 at 19:42 #314603
Robert Butler
Participant
@robertbutler92161
Black rubber – all sounds rather…………………??
30 August 2017 at 19:54 #314608
Stuart Bridger
Participant
@stuartbridger82290
No idea on a source, but I spent a couple of weeks in the rubber moulding department at BAe Brooklands during my apprenticeship. They manufactured non standard seals and mouldings for both prototype and production use. There was a great variety of raw ingredients, which were mixed up and milled before moulding and curing. It really was like cooking, the recipe had to be followed exactly or the result was a disaster. Looking back on it now there was so much I picked up in those days, it just needs posts like these to jog my memory.
30 August 2017 at 21:10 #314622
MW
Participant
@mw27036
Posted by Hacksaw on 30/08/2017 17:44:12:

I don't suppose anyone knows where i could buy say a kilo or 2 of raw black rubber ? . I hope to vulcanize it myself in my own mold , in the oven, when my wife is out…Does it ( raw ) have a shelf life , does it dry out , do you keep it wrapped ?? Baines rubber is near me , I'm sure they use it , but the jobsworth on the counter is negative about selling me a bit !

I have a load of 30mm round P.U ( black) rubber bars if that helps?

I can also link you to the Alibaba page where I got it from, factory seems legit.

Michael W

Edited By Michael-w on 30/08/2017 21:11:41
30 August 2017 at 21:58 #314630
Hacksaw
Participant
@hacksaw
I think want some similar to this type at 3.00 **LINK**

It' for a thick gasket rubber moulding .. My prototype mould is a bit rough but it's producing what i want with low melt casting rubber . I'll put some pics up. I'd rather not use urethane rubber as it's a bit pricey !
30 August 2017 at 22:59 #314640
Hacksaw
Participant
@hacksaw
It's a foglight gasket for a Ford Fiesta mk1

2 rectangular plates and spigots will make this sides shape, then a clamping plate on top (and the top corners need a shallower radius I know , hence it's only tacked together at the mo . )

Low temperature (supposedly ! )melt rubber stuff., trial fill ..

Step on the swage line just right !

So I want to put the rubber dough in the mould bolt through the middle clamping the plates till it oozes out , and then cook it . These are impossible to get now , and they perish ..

Edited By Hacksaw on 30/08/2017 23:03:42
31 August 2017 at 04:29 #314647
thaiguzzi
Participant
@thaiguzzi
Pop out here. I'll give you a couple of kilos for free.

I have 25 acres of rubber trees being tapped, we just sold @ auction yesterday, cup lump (yes it does pong) at roughly 0.67 pence per kg.
31 August 2017 at 08:36 #314657
Clive Hartland
Participant
@clivehartland94829
Perhaps try some of that self amalgamating rubber tape used for sealing cabling, You may need a a few reels though. Strip off backing and layer it and see what happens when you apply a little heat and pressure.

Clive
31 August 2017 at 09:21 #314664
Jon Gibbs
Participant
@jongibbs59756
Sugru? Not cheap but would do the job I think.

**LINK**

Jon
31 August 2017 at 10:21 #314671
Gordon W
Participant
@gordonw
I have been using cheap hot glue gun for this sort of job. Buy some black filler rod and practice a bit, just refitted mud flaps on my motor and looks quite good, by my standards anyway.
31 August 2017 at 12:07 #314682
Ian S C
Participant
@iansc
When I was helping a guy building, and rebuilding Willys Jeeps, I made some molds, and a firm in Christchurch(NZ) cooked them up. The molds cost me next to nothing to make, but I was told that their value would range from $NZ1000 to $NZ3000. What sort of rubber do you need, most of ours was done with 5011 Hy Car Nitrile rubber, this stuff is fuel proof.

Ian S C
31 August 2017 at 15:52 #314707
Hacksaw
Participant
@hacksaw
Thanks for ideas , my panic is over , something exciting is being posted to me ! From the tyre remoulders in the link i posted.Really helpful, the postage is more than the compound itself…
31 August 2017 at 16:11 #314708
richardandtracy
Participant
@richardandtracy
Could use silicone casting rubber from http://www.mbfg.co.UK the red hardener stuff, 20 shore A, is excellent. Takes 8 hrs to cure, can be coloured and if a mould release is used, it can be used as the mould too. The Polycraft GP 3481-F is stuff I have used, and bought some more after finishing the first 500g. Only the hardener is a bit unpleasant, the main component is inert, as is the cured rubber.

Regards

Richard
31 August 2017 at 16:32 #314710
Adrian R2
Participant
@adrianr2
Have you thought of trying plumbers adhesive mastic, Tigerseal or similar? This is thick black and sticky but dries to a rubbery consistency and would probably hold a moulded shape.

I don't know its longevity but the outside galvanised tank that I glued up a couple of years back is still holding water.
31 August 2017 at 18:32 #314725
mark costello 1
Participant
@markcostello1
Could You go to a tire retreaders and get a sample?
31 August 2017 at 18:50 #314733
Watford
Participant
@watford
I have had success with cold casting rubber.

From MB FibreGlass the variety I used was 'Polytek PT-Flex 85 PU Casting Rubber'.

There is a range of hardness's, 85 being at the hard end and equated to trolley caster wheels.

I was/am restoring a very vintage typewriter and need a new roller. I have had a trial run on a short roller which went O'K.

MB FibreGlass is worth a look as they have a vast range of such products.

Mike

http://www.mbfg.co.uk/polyurethane-rubbers/duroflex-85.html
31 August 2017 at 19:49 #314744
Neil Wyatt
Moderator
@neilwyatt
Or just buy one off eBay for £5…
31 August 2017 at 20:05 #314746
richardandtracy
Participant
@richardandtracy
Where's the fun in that?

Regards

Richard.
31 August 2017 at 20:07 #314748
Hacksaw
Participant
@hacksaw
Posted by Neil Wyatt on 31/08/2017 19:49:45:

Or just buy one off eBay for £5…

Yeah but it wont fit a mk1 though . The seller is using " Mk1 " to grab attention .

Early mk 1 had skinny bumpers ..the foglight sat above the swage line ,the gasket was a simple U shape . Facelift Mk1 had thicker bumpers , the fog had to go lower right on the swage line ..like mine , The Mk2 used the ebay item you've linked ..fitted even lower on the rear valence . They cant be mixed and matched…the tilt wedge bit is all wrong..

The remould tyre place is posting me the un vulcanized stuff, he was quite confident it will work . I'm making them to sell. Tried PU already but its not stable enough

The real deal have been seen to go for daft money..£70 !!! "classic Ford tax " though a fiesta is hardly a classic is it ? Big money too, for old pale blue ford grill badges …

Edited By Hacksaw on 31/08/2017 20:12:16

Edited By Hacksaw on 31/08/2017 20:14:27
31 August 2017 at 21:13 #314756
Dinosaur Engineer
Participant
@dinosaurengineer
I doubt if it's made from rubber. Rubber has largely been superceded by neoprene as rubber is now quite expensive..
1 September 2017 at 04:28 #314773
thaiguzzi
Participant
@thaiguzzi
Not necessarily. NR (natural rubber) and SR (synthetic rubber) are traded on the stock market as commodities. Both prices follow the price of oil. Sort of. And obviously supply and demand. Synthetic rubber is oil based. When the oil price is high, manufacturers will switch to natural if their product allows it and vice versa. Certain applications will always recquire either only one NR or SR or the other. Certain o rings produced are always NR and ditto some are only SR due to heat amongst other things.

On a small average hatchback car, there is not more than 1 kilo of natural rubber per tyre. Competitive racing tyres and commercial aircraft tyres carry a much higher NR percentage in the tyre's make up.
1 September 2017 at 07:45 #314778
Gary Wooding
Participant
@garywooding25363
Take a look at **THIS** it looks like it could do the job.
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