Translating Mg to ml- is it possible for hardener?

[mart]

I have a large (3.5 litre) tin of Tetrosyl “super litre” smooth body filler. The instructions on the tin state 100 to 1 ratio of filler to hardener. I have never had a problem of adding the correct amount of hardener to filler-just a tiny bit does the job.

Two tubes of 40g size hardener accompanied the tin. It does not seem much hardener for such a large tin. I phoned the manufacturer in an attempt to establish how many tubes should be with a tin of this size. It was a bit like pulling teeth, as the guy was just saying there is sufficient hardener for the amount of filler. He would not commit himself on the number of tubes. (For all anyone knows a tube could have gone missing at some point).

If it was possible to translate 40mg to ml I would be able to do the maths for the ratio and establish if there is indeed the correct amount of filler. I don’t why the filler is stated in litres as it is even "less of a liquid" than the hardener.

 

[grim_d]

I would just work on the general golf ball of filler to a pea of hardener, add a bit more if you are worried or do a small scale test with it before mixing up a large batch.

Extra tubes of hardener are only a couple of quid if you run out.

 

[ajlelectronics]

Weight the filler then the hardener. Guestimate the packaging weight and see if you have around 100 to 1. The units are irrelevant as long as they are the same units. You have 80g of hardener, so you should have 8Kg or less of filler.

 

[R Kraft]

A gram is a milliliter.
At least that's the way I remember it .
3.5L would be 3500ml.
At 100 to one , you would need 35ml of hardener.
Robert

 

[mart]

A gram is a milliliter.At least that's the way I remember it .
3.5L would be 3500ml.
At 100 to one , you would need 35ml of hardener.
Robert

Lead or balsa wood

 

[Luke]

A gram is a milliliter.
At least that's the way I remember it .
3.5L would be 3500ml.
At 100 to one , you would need 35ml of hardener.
Robert

Only for water, and even then it's not strictly accurate.

 

[R Kraft]

I agree,you would need to know the specific gravity of the hardener.
You would also need to know at what temperature the ratio is 100 to 1,because it is unlikely that they share the same coefficient of expansion.
Really it could be made complicated enough,that it would be impossible to do.

 

[Master-of-none]

It doesn't need to be that accurate although generally the more filler, the less (proportionately) of hardener is needed.
As the chemical reaction starts, the mass heats up, increasing the speed of cure.
So the golf ball to pea ratio works for a golf ball size.
Small blobs of filler on a cold day may need a slightly larger dose of hardener.

For 3.5kg, 40g is close to 100:1, I suspect you get 2 tubes because people can't judge 100:1 accurately enough, run out and moan to the makers.