rubber and heat

[TiggerToo]

up to what temperature is rubber "safe" ? i.e. does not melt/catch fire etc...

 

[vyv_cox]

It entirely depends what you mean by 'rubber'. There are many synthetic elastomers used for every purpose, from shoe soles to car tyres, or high performance fluorinated O-rings. Natural rubber is pretty poor stuff, not used for much nowadays. What type do you mean?

 

[TiggerToo]

It entirely depends what you mean by 'rubber'. There are many synthetic elastomers used for every purpose, from shoe soles to car tyres, or high performance fluorinated O-rings. Natural rubber is pretty poor stuff, not used for much nowadays. What type do you mean?

The stuff they use for "grommets"

 

[nigelmercier]

The stuff they use for "grommets"

Assuming Silicone, then 300°C. What do you want to do with it?

 

[TiggerToo]

Assuming Silicone, then 300°C. What do you want to do with it?

replace worn ones on a SMEG stove that help keep the panholders in place. 300C should do it. Problem is that the minimum order is 100 pieces, and I only need 8... anyone else need some?

 

[vyv_cox]

The stuff they use for "grommets"

Most probably nitrile, although it could be neoprene. There's a guide here but it is only a guide, nitrile in particular can vary in composition and properties quite a lot. Those temperatures are in degrees F. My recollection is that we never used it above 100C but that is more because it extrudes badly above that temperature. A grommet doesn't need a lot of strength so the figure in the table might be OK.

Now seen your later post, I wouldn't have called them grommets, although they have the same shape. Shows how careful you need to be when asking questions.

 

[nigelmercier]

The stuff they use for "grommets"

replace worn ones on a SMEG stove that help keep the panholders in place. 300C should do it. Problem is that the minimum order is 100 pieces, and I only need 8... anyone else need some?

Got a picture, and size?

 

[TiggerToo]

Now seen your later post, I wouldn't have called them grommets, although they have the same shape. Shows how careful you need to be when asking questions.

what would you have called them then? They look like grommets, function as grommets...
Anyhow, I am still looking...

 

[vyv_cox]

what would you have called them then? They look like grommets, function as grommets...
Anyhow, I am still looking...

I don't know, what do SMEV call them? The problem, as you may be finding out, is that grommets are used to protect electrical wiring and tubing from chafe. There is not normally a requirement for heat resistance, so they are made from relatively low grade elastomers. As soon as you have a requirement for temperature resistance you are looking at silicones, hydrogenated nitriles, perfluorelastomers, which would be unusual in a simple grommet.

 

[nigelmercier]

what would you have called them then? They look like grommets, function as grommets...
Anyhow, I am still looking...

Look on eBay for Silicone Grommets, although there are some listed as Silicon!