West System

whammo57

whammo57

Kim Walker
Silver Member
I want to mix west system in smaller batches than the pumps give me. What is the proper mix ratio by weight. I am using 105 and 207 special clear.

I have found 3.5-1 and 3.7-1 on the West system web site. I found 3-1 on the internet at a marine outlet.

thanks,

Kim
 
whammo57 said:
I want to mix west system in smaller batches than the pumps give me. What is the proper mix ratio by weight. I am using 105 and 207 special clear.

I have found 3.5-1 and 3.7-1 on the West system web site. I found 3-1 on the internet at a marine outlet.

thanks,

Kim
Click to expand...

Use the correct mixing ratio of the hardener from the west system website: 3 parts resin : 1 part hardener.


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Last edited:
whammo57 said:
I want to mix west system in smaller batches than the pumps give me. What is the proper mix ratio by weight. I am using 105 and 207 special clear.

I have found 3.5-1 and 3.7-1 on the West system web site. I found 3-1 on the internet at a marine outlet.

thanks,

Kim
Click to expand...
i put a chart on here the other day with it broke down into 1/8th ounce increments starting at .125 up to 2.00 ounces

i spent a lot of time on it
nobody gave it a second look
so i deleted it since it wasnt important to anyone but me
empty post here
http://forums.azbilliards.com/showthread.php?t=226013

look on your hardener can,
it gives you the ratio there in the directions

it says 3.7 to 1, by weight
for the 207C

it says 5.0 to 1, by weight
for the 206
 
Last edited:
BHQ said:
i put a chart on here the other day with it broke down into 1/8th ounce increments starting at .125 up to 2.00 ounces

i spent a lot of time on it
nobody gave it a second look
so i deleted it since it wasnt important to anyone but me
empty post here
http://forums.azbilliards.com/showthread.php?t=226013

look on your hardener can,
it gives you the ratio there in the directions

it says 3.7 to 1, by weight
for the 207C

it says 5.0 to 1, by weight
for the 206
Click to expand...

Brent, i thought it was pretty cool, and appreciate that you put it out there for others.
 
LGSM3 said:
Brent, i thought it was pretty cool, and appreciate that you put it out there for others.
Click to expand...

DUH.... feeling dumb, it was on the can!

Just because no one commented doesn't mean no one read your post. I wonder how many copied the information. I was able to recreate the chart using excel.

Thanks for the info

Kim
 
scale

West System sells a small batch scale that works great. It will measure down to .1 gram. It cost about $40 but will save tons of money in waste material over using a full stroke on the pumps. The way to use the scale is to tare the mixing container, add the hardner, multiply the hardner weight by 4.5 (for 207 hardner) and add the resin up the calculated amount. The directions for use are printed on the inside of the lid on the scale so you don't have to remember anything.
 
mark smith said:
West System sells a small batch scale that works great. It will measure down to .1 gram. It cost about $40 but will save tons of money in waste material over using a full stroke on the pumps. The way to use the scale is to tare the mixing container, add the hardner, multiply the hardner weight by 4.5 (for 207 hardner) and add the resin up the calculated amount. The directions for use are printed on the inside of the lid on the scale so you don't have to remember anything.
Click to expand...

Why multiply by 4.5? shouldn't it be 3.7? Or am I missing something??

Kim
 
JoeyInCali said:
3.7 TO 1 ratio.
3.7 of epoxy plus 1 part hardener=4.7.
So 1 gram hardener, then add 3.7 of epoxy will total 4.7 grams.
Click to expand...

You are right ... I didn't look at it that way. My chart is below... the column headings don't line up because I copied it from an Excel spreadsheet. Your 4.7 calculation shows up in the first line of the chart. I laminated this chart and nailed it on my wall. It will save me a lot of wasted west system epoxy from using the pumps.

Kim


Hardener gm Resin gm Total gm
1 3.7 4.7
2 7.4 9.4
3 11.1 14.1
4 14.8 18.8
5 18.5 23.5
6 22.2 28.2
7 25.9 32.9
8 29.6 37.6
9 33.3 42.3
10 37.0 47.0
11 40.7 51.7
12 44.4 56.4
13 48.1 61.1
14 51.8 65.8
15 55.5 70.5
16 59.2 75.2
17 62.9 79.9
18 66.6 84.6
 
I put the hardener in the tub 1st, what ever the scale shows in grams of hardener,I use my calculator to get the total and add resin to that number.
It saves having to be so precise twice,when the important factor is the total is correct.
It does help to know that if you went .1 grams over on the hardener, that you will need an extra .37 grams of resin or what ever the ratio's are.
 
Hello,

I have these two charts for the different hardners that you can use by weight. I think they are correct but if anyone finds them to be incorrect please post any corrections.
 

Attachments

conetip said:
I put the hardener in the tub 1st, what ever the scale shows in grams of hardener,I use my calculator to get the total and add resin to that number.
It saves having to be so precise twice,when the important factor is the total is correct.
It does help to know that if you went .1 grams over on the hardener, that you will need an extra .37 grams of resin or what ever the ratio's are.
Click to expand...

That's a neat idea.....

It is difficult to get an exact gm amount of hardener using that little pump in the can. I will try that.

Kim
 
I keep it simple

When mixing 207 plus resin, I zero my scale on the mix cup weight, then add an amount of resin that looks like I will need, then weigh it. Multiply the weight times 1.27 and that is what total weight I need with hardener, no charts needed, and all in between amounts are covered.

Weight of resin X 1.27 = total weight with hardener needed.

Even easier with 205 or 206 hardener:

weight of resin X 1.2 = total weight with hardener

Easy for me to remember, KISS principle!
 
olsonsview said:
When mixing 207 plus resin, I zero my scale on the mix cup weight, then add an amount of resin that looks like I will need, then weigh it. Multiply the weight times 1.27 and that is what total weight I need with hardener, no charts needed, and all in between amounts are covered.

Weight of resin X 1.27 = total weight with hardener needed.

Even easier with 205 or 206 hardener:

weight of resin X 1.2 = total weight with hardener

Easy for me to remember, KISS principle!
Click to expand...


How did you come up with this number??
 
just math Joe

For the West 207 hardener
(wt resin + wt hardener) / wt of resin = (3.7 + 1) / 3.7 = 1.27approx.

so 1.27 units is the total wt for a wt of resin of 1 unit. The units can be grams, ounces, pounds, grains, or KiloGrams does not matter as long as both resin and hardener are both using the same unit of weight! I always found the gallon resin can harder to handle than the smaller hardener cans, so I prefer to do the resin first, and I eyeball how much I need of it, then weigh it and know what the total wt should be with my simple formula.

Again 1.20 is the number to use for the 205 or 206 hardeners:
(5+1)/5= 1.2

I Read what you guys were doing to get your ratios right and thought it was too much work so I put my training as a Mathematician to the test. Hope it helps someone in the future?
 
olsonsview said:
When mixing 207 plus resin, I zero my scale on the mix cup weight, then add an amount of resin that looks like I will need, then weigh it. Multiply the weight times 1.27 and that is what total weight I need with hardener, no charts needed, and all in between amounts are covered.

Weight of resin X 1.27 = total weight with hardener needed.

Even easier with 205 or 206 hardener:

weight of resin X 1.2 = total weight with hardener

Easy for me to remember, KISS principle!
Click to expand...

You can easily apply this to other ratios, which what I do,except I weigh the hardener 1st. The main reason for this is, a .1 gram error in the hardener amount is more than the .1 gram error in resin amount.
Some of the resins I use, have a very narrow tolerance to get the best performance from them, and this method has been the most successful in mixing small batches.
 
olsonsview said:
For the West 207 hardener
(wt resin + wt hardener) / wt of resin = (3.7 + 1) / 3.7 = 1.27approx.

so 1.27 units is the total wt for a wt of resin of 1 unit. The units can be grams, ounces, pounds, grains, or KiloGrams does not matter as long as both resin and hardener are both using the same unit of weight! I always found the gallon resin can harder to handle than the smaller hardener cans, so I prefer to do the resin first, and I eyeball how much I need of it, then weigh it and know what the total wt should be with my simple formula.

Again 1.20 is the number to use for the 205 or 206 hardeners:
(5+1)/5= 1.2

I Read what you guys were doing to get your ratios right and thought it was too much work so I put my training as a Mathematician to the test. Hope it helps someone in the future?
Click to expand...

I like your method, this is very quick and simple. Thanks
 
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