Epoxy pumps

**riverbuilder** · 15th December 2019, 10:14 AM

So my epoxy pumps have finally died after a decade or so, and looking around for more I’ve discovered that Trojan fibreglass ( who are the cheapest supplier of epoxy by far) don’t sell them. This leaves me with Carbatec ($59)or Whitworths($52). So I got to looking and found there are cleaning product suppliers that sell them for $8!!. Upon inspection it appears that the hardener pump has a simple plastic sleeve that stops the pump at the required volume to give a 5 to 1 ratio, which I can simply clip on to the new pump.
Anyone else see how this would not work?
I’m thinking I would check the dispensed amounts with a set of digital scales before mixing epoxy with them, Thoughts?

**Pagie** · 15th December 2019, 10:31 AM

That should work fine. I gave upon pumps as they kept on stuffing up for me. I just measure on the side of the container. A straight sided container and a sharpie is all you need.

**riverbuilder** · 15th December 2019, 10:42 AM

Originally Posted by Pagie

That should work fine. I gave upon pumps as they kept on stuffing up for me. I just measure on the side of the container. A straight sided container and a sharpie is all you need.

it would work but not accurate enough or repeatable for me, some of my glue ups are for aeroplane components and everything has to be documented and traceable.

**cava** · 15th December 2019, 01:03 PM

Originally Posted by riverbuilder

it would work but not accurate enough or repeatable for me, some of my glue ups are for aeroplane components and everything has to be documented and traceable.

If everything has to be documented and traceable then only go the original pump - litigation can be a nightmare you don’t want.

**Pagie** · 15th December 2019, 06:53 PM

If you weigh the mix you will find the pumps are not that accurate.

**justonething** · 15th December 2019, 10:35 PM

Originally Posted by Pagie

If you weigh the mix you will find the pumps are not that accurate.

a 10 bux digital scale is the only way to accurately measure the mix

**qwertyu** · 22nd December 2019, 10:07 AM

when it comes to accuracy and epoxy, i find most state the ratio in volume not weight. Any tips on that?

I have been measuring the weight after weighing set volumes and writing the ratio down but its a bit of a pain

**justonething** · 22nd December 2019, 07:34 PM

Generally, the resin is a bit denser than hardener. I found it to about 1.05 times for epoxy from solid solutions, but it could be similar for others as well. For example, west system epoxy says that the 5:1 mix by volume is about 5.18:1 by weight. But if you want it to be exact, then you have to look into their datasheets. For example, the west system epoxy datasheet has all the information you need

**PaintMan** · 30th December 2019, 03:43 PM

Agree fully that using weight is the safest and best repeatable way to go especially if you are working with smaller amounts. Just find the data sheet for the product you are using then look for the SG (specific gravity) to convert volumes into weights. It is also important to keep your epoxy materials in a cool dry place especially for the hardener as some of these "part B" materials that are often formulated to give better curing characteristics can be volatile.
Cheers,
Paintman

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