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Wednesday, 17 December 2003
Epoxy Hardeners:
(This cure speed table applies to resins sold at BoatBuilderCentral.com.)
Mixing Ratio
All our resins use a 2:1 ratio. This means two volumes of resin for one volume of hardener. Note that the ratio is by volume, not weight. The easiest way to measure the proper volumes is with a dispensing pump. Buy two: one for the hardener, one for the resin, The pumps fit right on the epoxy jugs.
Hardener speed
Epoxy mixed with hardener will cure in a wide range of temperatures but the speed of the cure varies with the hardener. We sell three hardeners: slow, medium and fast. They can be mixed for even more precise cure speed. Below we show a table with typical cure speeds. After the indicated times (minutes), at those temperatures, a batch of mixed resin and hardener ( 30z./100gr) will begin to gel.
|
?F
|
?C
|
Fast
|
Medium
|
Slow
|
|
35 |
2 |
90 |
|
|
|
40 |
4 |
72 |
|
|
|
45 |
7 |
60 |
|
|
|
50 |
10 |
50 |
120+ |
|
|
55 |
13 |
41 |
92 |
|
|
60 |
16 |
33 |
69 |
120+ |
|
65 |
18 |
28 |
56 |
106 |
|
70 |
21 |
22 |
44 |
89 |
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75 |
24 |
18 |
35 |
74 |
|
80 |
27 |
14 |
28 |
61 |
|
85 |
29 |
12 |
24 |
49 |
|
90 |
32 |
10 |
20 |
41 |
|
95 |
35 |
8 |
16 |
35 |
|
100 |
38 |
6 |
13 |
30 |
|
105 |
41 |
5 |
11 |
26 |
|
110 |
43 |
4 |
9 |
21 |
The ideal temperature ranges are highlighted. Note that resin will cure faster in a larger batch but slower when spread over fiberglass. Mix small batches at a time and wait 24 hours before sanding.
Try our epoxies with our trial kit. It includes samples and the Epoxy Book: 55 pages of clear information about epoxies and their use.
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Friday, 21 November 2008
