Pump
Ira wrote:
A scale that gives you 0.5% is way better than necessary since 5% is
probably just fine.
Favid Miller wrote:
the Aeropoxy reps at Oshkosh, they were clearly amused by anyone bothering
to measure to the nearest tenth of a gram - off the record they indicated
that the tolerance levels for a proper cure are quite high.
I don't know who is correct, but Martin Armstrong, technical director of SP
Systems (Ampreg) told me, as stated in the data sheets, that 2% is the
maximum permissable error in mixing resin and hardener - any greater error
results in measurable and significant reductions in strength. He was very
concerned that some people get a bit "gung ho" about it. And 2% is only 0.1
gram of hardener in a 5g / 20 g mix. And a similar error in the opposite
direction neasuring the resin would result in a 4% total error.
Keith Hickling,
New Zealand.
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