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UrethaneProperties

2-18-04 MarkCutkosky
For some older materials and property information see

Table of Material Properties and Observations
Note: for information on disposal of these materials see: UrethaneWaste

Urethane Color Gel Time (min) Published Demold Time Shore Hardness Tensile Strength (psi) Application Observations Manufacturing observations
IE-10A cream 10 10 hrs 10A 150 Very sticky to the touch, sticks very well to many surfaces. Stickiness decreases as it collects residue. Can be cleaned with water to restore stickiness. Too soft to machine in any way, including planing. Instead, can be "squeegeed" by pouring enough urethane to slightly overflow cavity, and then scraping off any excess with a flat wax bar or other flat object.
IE-35A clear 15-20 24 hrs 35A 400 Somewhat sticky, but not nearly as much as 10A. Much tougher than 10A. Probably too soft for most flexure applications. Can be squeegeed as with IE-10A. Seems to take significantly longer to cure than other urethanes - up to 72 hours!
IE-90A cream 15-20 8 hrs 90A 1800 Commonly used for flexures Can be planed (carefully!) if cutter is cleaned off after each pass.
IE-72DC clear 15-20 4 hrs 80D 10000 Commonly used for structural components. Can be machined after curing
Tap Quik-Cast White 2 10 min 72D 5000 Commonly used for structural components. Have not done any degassing because of fast gel time. Have not had any problem with bubble formation. Can be machined when cured.
RC-77D Amber 1.2 15 min 75D 8500   Did not do any degassing because of fast gel time. Cured part has significant number of small bubbles throughout.
RC-520 Black 1.2 20-30 min 80D 7900   Did not do any degassing because of fast gel time. Cured part appears to have significant number of small bubbles throughout, although opaque color makes it difficult to tell. Significant part shrinkage left exposed gaps around edge of mold. This resulted in the part popping out of the mold during planing operation.
VA-190 White 2   85A 2500   Rapid Vac product, has low viscosity for better results when using vacuum-assisted casting.
VA-285 Semi-clear 4   77D 11718   Rapid Vac product, has low viscosity for better results when using vacuum-assisted casting. Did not do any degassing because of fast gel time. Cured part has significant number of small bubbles throughout.
Note: all polyurethanes listed above are from Innovative Polymers except for Tap Quik-Cast (from Tap Plastics)

-- MiguelPiedrahita? - 19 Nov 2003

Other supplier worth checking out: http://www.freemansupply.com/
Silicones: http://www.silicones-inc.com/

 
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