Has anyone tried this epoxy for stators??

[Garry]

http://cgi.ebay.com/Epoxy-Casting-Resin-LowCost-LONG-POT-LIFE-192oz-SCR-BLK_W0QQitemZ270021629294QQi



hZ017QQcategoryZ75576QQcmdZViewItem

You Are Bidding on a 192 ounce kit of

MAX SCR

SLOW CURING RESIN

Black

1. Gallon of Resin
   
1. Half Gallon of Curing Agent
   
   

For International Orders Please Inquire For Shipping Cost

MAX SCR is a two-component epoxy based resin with a long working time specially formulated for casting large to over size items (up to 4 pounds). It is filled with thermally conductive non-metallic fillers that improves dimensional stability, reduced shrinkage and facilitates in dissipating exothermic heat. MAX SCR is easily mixed and poured into place and provides a long working time even when mixed in large volumes. A 2000 gram mass can be mixed without overheating due to exothermic heat generation and will provide up to a one hour working time. It is suitable for use with silicone, polyurethane, steel, and wood molds. MAX SCR can be demolded after 36 hours room temperature cure or for a faster demold times, post cured under heat (30 minutes at 200oF) after it has gelled for 4 hours at room temperature allow to cool and demold.

MAX SCR can also be used as a potting or encapsulating compound for elcetrical or electronic circuitry. It is very thermally conductive making it a very effective heat dissipating epoxy system.

Viscosity Part A                               17,500 cPs

Viscosity Part B                               250 cPs

Mix Ratio By Weight:                     100 Parts A to 25 Parts B  (4:1)

Mix Ratio By Volume:                    100 Parts A to 50 Parts B (2:1)

Mixed Density                                  1.55 g/cc

Working Time:                                 120 minutes (400 gram mass)

Peak Exotherm:                              150oF max (400 gram mass)

Shore Hardness:                             75- 80 Shore D

Shrinkage:                                        <0.20 %

Compressive Strength:                 16,800 psi

Tensile Strength:                             9,900 psi

Tensile Elongation:                         2%

Heat Distortion Temperature:      200oF

 Garry

[Flux]

It looks to be similar to something I have seen used for potting electronic circuits.

It is ideal except for the ability to stand temperature, only a few highly special epoxies will stand the temperature that people are trying to run the polyester stators at. The heat distortion temp 200 degF is the limiting factor.

If you can live with a low output to keep the temperature below this it should be fine. What you gain from its thermal conduction will not go far to make up the output you loose from its temperature limitation.

If cheap enough it would be good for magnet rotors.

Flux

[DanG]

Heat distortion temperature may be the point where expansion is enough to lift or shear circuit board traces and not something air-core coils would be affected by?

[dinges]

Hmmm...

For all the talk about thermal conductivity in the add/specifications sheet, there's one spec that's glaringly absent in that list: the thermal conductivity.

With the information you've got now, you have no way of comparing it to ordinary epoxy/polyester/vinylester to see just how much better it is, and whether it would be worth any premium price.

Just a thing I noticed. I'm not familiar with the goo itself.