I had a table saved in my messages (which are now all deleted apparently???) that had the amounts for mixing Resin Research by weight. I believe I got it from Greg Tate… Does anyone have one they can email me please?
Chris , my Son…
…you do not need a scale or a chart…PapaRay taught you about volume…
…2-1…
yeah full grams table would be sweet, I've yet to make a table myself. lately, I've been eyeing hardener drop counts if my resin *.45 equates to decimal grms.
http://www.resinresearch.net/id8.html
100:45 by weight
hahaha, thanks PapaRay, I knew I was going to get responses like this =)
And thanks for the link Everysurfer…
the table that I was referring to was "resin … hardner … total material" for a bunch of different volumes of material… So, say you need 9oz of total material to lam the deck of this board. You would go to the table, find 9oz under total material and it would tell you how many ounces of resin and hardner to use so that you had the 100:45 ratio. Kind of a cheat sheet…
Now that I think about it, I should make one and post it up. It'd be a good thing to have taped to the side of my rubbermaid bin that holds my glassing supplies.
| Resin | Hard. | Resin | Hard. | Resin | Hard. | Resin | Hard. | Resin | Hard. | Resin | Hard. | |||||
| 5 | 2.25 | 105 | 47.25 | 205 | 92.25 | 305 | 137.25 | 405 | 182.25 | 505 | 227.25 | |||||
| 10 | 4.5 | 110 | 49.5 | 210 | 94.5 | 310 | 139.5 | 410 | 184.5 | 510 | 229.5 | |||||
| 15 | 6.75 | 115 | 51.75 | 215 | 96.75 | 315 | 141.75 | 415 | 186.75 | 515 | 231.75 | |||||
| 20 | 9 | 120 | 54 | 220 | 99 | 320 | 144 | 420 | 189 | 520 | 234 | |||||
| 25 | 11.25 | 125 | 56.25 | 225 | 101.25 | 325 | 146.25 | 425 | 191.25 | 525 | 236.25 | |||||
| 30 | 13.5 | 130 | 58.5 | 230 | 103.5 | 330 | 148.5 | 430 | 193.5 | 530 | 238.5 | |||||
| 35 | 15.75 | 135 | 60.75 | 235 | 105.75 | 335 | 150.75 | 435 | 195.75 | 535 | 240.75 | |||||
| 40 | 18 | 140 | 63 | 240 | 108 | 340 | 153 | 440 | 198 | 540 | 243 | |||||
| 45 | 20.25 | 145 | 65.25 | 245 | 110.25 | 345 | 155.25 | 445 | 200.25 | 545 | 245.25 | |||||
| 50 | 22.5 | 150 | 67.5 | 250 | 112.5 | 350 | 157.5 | 450 | 202.5 | 550 | 247.5 | |||||
| 55 | 24.75 | 155 | 69.75 | 255 | 114.75 | 355 | 159.75 | 455 | 204.75 | 555 | 249.75 | |||||
| 60 | 27 | 160 | 72 | 260 | 117 | 360 | 162 | 460 | 207 | 560 | 252 | |||||
| 65 | 29.25 | 165 | 74.25 | 265 | 119.25 | 365 | 164.25 | 465 | 209.25 | 565 | 254.25 | |||||
| 70 | 31.5 | 170 | 76.5 | 270 | 121.5 | 370 | 166.5 | 470 | 211.5 | 570 | 256.5 | |||||
| 75 | 33.75 | 175 | 78.75 | 275 | 123.75 | 375 | 168.75 | 475 | 213.75 | 575 | 258.75 | |||||
| 80 | 36 | 180 | 81 | 280 | 126 | 380 | 171 | 480 | 216 | 580 | 261 | |||||
| 85 | 38.25 | 185 | 83.25 | 285 | 128.25 | 385 | 173.25 | 485 | 218.25 | 585 | 263.25 | |||||
| 90 | 40.5 | 190 | 85.5 | 290 | 130.5 | 390 | 175.5 | 490 | 220.5 | 590 | 265.5 | |||||
| 95 | 42.75 | 195 | 87.75 | 295 | 132.75 | 395 | 177.75 | 495 | 222.75 | 595 | 267.75 | |||||
| 100 | 45 | 200 | 90 | 300 | 135 | 400 | 180 | 500 | 225 | 600 | 270 |
The following chart shows mixing amounts for Resin Research products that have 100:45 resin:hardener weight ratios. I alway set my scale to read-out in grams.
Here is another chart that skips the whole ounces foolishness.
I prefere to measure by volume as I was also taught by Papa Ray. I recently came across a stash of cheap mixing cups with no volumetric indicators; hence, I am currently measuring by weight. As soon as my stack of cups goes to zero I am going to seek out some different cups with markings on them.
thanks Swied!
Team, it's a stochiometric relationship. Not a catalist driven reaction. So many molecules of A to so many molecules of B. the closer you get to the 100:45 ratio, the stronger the mix will be.
Test your ability to accurately sight mix 1:2 by measuring two cups (a 1 and 2 once) using your god given eyeballs and then weigh that mix. You will be humbled. Your epoxy (sight mixed) will harden, but when mixed by weight will be stronger. It's a law you cannot break.
I am sorry I had to speak this way to you, but it is for your own good. ha.
all the best
Fark Gregtate…never had a surfboard not cure…and never had anyone tell me I build a "weak" surfboard…
100:45 scale vs 100:50 eyeball…with Resin Research it's just not a big deal…It's a Surfboard. no need to split atoms…Stingray…
…scales are flawed too. The scales where I work get tested monthly. How often does a backyarder calibrate his scale…and I'm not humble…My stuff is big time quality and rock solid…a slight of the scale or mixing cup does not matter …RR is made that way.
Hi Ray,
No need to calibrate our scales. If it is off on part "A" it will be just as off on part "B".
If you go by volume, you need to use two cups, and scrape every last little drop off of one cup and into the other. With weight, everything goes into one cup. Measure out 250g of part A and add 100g of part B (Fiberglass Hawaii 100:40 ratio). Then mix it all up. Pour into a second cup so you can really scrape the sides of the first cup, then pour it back, mixing as you go.
After it is all mixed, then add your additives, thinners, tints, etc, and mix that all together.
But I'm just anal about that stuff.
18 more days. Better wrap those boards up boys!
this argument has been gone through ad neauseum… some like the scale some like the visual… Some don't like to mix enough and then post threads about how epoxy sux… Do what works for you… Me, I like the scale…
Yah, wrap 'em up… Got my work cutout for me… 2 just got the bottom lam… About to lam the 3rd… couple hours from now, it's time to flip and lam the decks… Hotcoats in the early morning.
Weighing it is better–for the money and for the cure… And with a paper cup with sharp corners and flat bottoms, these shoots live up to the premium rates charged for this stuff. Might as well weigh it…to the gram. Don't have to buy a $4 graduated cup that likely is usable only 1-2x.
…I say my 2 cents lightly because the UV cure zeroVOC epoxy, albeit expensive at moment, requires no mixing—has me thinking. Reuse what you don't apply, damn. Magic. Can't wait to skin my EPS in Fusiion plys and have it cured in 2 minutes of natty sun.
Hey, Swied, that first chart you have posted looks incorrect. Unless I'm high, someone correct me how 10 grams of resin and 4 grams hardener yields a correct ratio of 100:45…
Eyeballing epoxy is like wiping you ass with your bare hand.
Not that it doesn't work, it's just stupid.
The numbers are right. They are just rounded to the nearest gram. My scale doesn't show fractions of grams. Does yours?
Here is the basic math:
Let r=resin, h=hardener, and t=total
Equation 1: t = r + h
and
Equation 2: 100/45 = r/h (from the RR specs)
A little algebra will yield the following formula:
r = t/1.45
So lets look at your question regarding how 10 grams of resin and 4 grams of hardener could work.
t = 10 + 4 = 14
r = 14/1.45 = 9.6552 which rounds up to 10
There you have it.
The nice thing about the second table that I posted is that you can see the points where you can get a perfect 100:45 ratio. I show the numbers in that table to two decimal places. If you are paranoid about perfect mixing ratios then only mix amounts that come out to whole numbers. For example 20:9, 40:18, 60:27, etc…
Ray, you are a good man. Actually, you can't help it. That's good and its why i always read your posts. We just don't agree that I am obviously right on this point. May your boards be hard and …I dunno…anything else you want. Carry on.
All the best