+x

 

oekmont - 3/19/2019 12:02:24 PM

If you really need small quantities, get two 10ml syringes for a few pence. And than use the "by volume" 2:1 ratio. If you label both syringes for resin and hardener, you can use them multiple times, until the hardener syringe becomes clogged.

+x

 

oekmont - 3/19/2019 3:33:26 PM

Yes and no. Grams No, ml yes. If you mix by weight it's still 100/45 or a multiple/fraction of that.
You could use 20/9 by weight (No syringes, only a cup on a scale), wich would be close to your desired 24g.
Syringes will give you a certain volume, therefore it's 2:1
By weight= 100:45
by volume= 2:1
Always.

+x

 

Warren (Staff) - 3/19/2019 5:18:56 PM

The density of the mixed resin and hardener is NOT 1 it is 1.1g/ml.

In very small mixes that you are doing, the difference is small due to the accuracy of the  equipment  available to measure it at that scale.  That is why it looks the same.  For larger batch sizes the difference is noticable.

Very small batch sizes are not recommended due to the problems with accuracy for such small batches.  It is easy for a small measurement error to be proportionally significant and causing a curing issue.  Even the small amount of resin in the corners at the bottom of a cup can be enough to mess up the mixing ratio at small batch sizes.

Sometimes for smaller batches it is better to accept a bit of waste from mixing  a bigger batch but having the confidence that the resin will cure fully.

+x

 

Warren (Staff) - 3/25/2019 11:22:05 AM

At a 25g batch size i would want to be using jewelers or weed smokers similar precision scales that can give you at least one or two decimal place accuracy.  Then just round to the nearest decimal place you can measure to.  eg if you have 2 decimal places, use those figures as is, if your scales are 1 decimal place then round to 17.2g and 7.8g respectively.