Need Polyurethane Deadener

There is a material called VINAMOULD which is used in the fibreglass industry to make low volume moulds. You heat the chippings and it becomes liguid enough to pour into or onto a mould to make a mould for a GRP product.

Once cooled it is rubbery - there are different grades of stiffness - so that a complex product can be removed.

On heating it melts again.

Hugh Mattos

Chartered Engineer

Perhaps this material?

http://www.sorbothane.com/

Sorbothane looks great! I forgot about Sorbothane. The only problem that I have with the Sorbothane product is that I would probably have to enter into a contract with Sorbothane for a minimum run of parts, and the parts would require me to be able to insert the Sorbothane between the male and female parts, which I am not sure that I could at this time. I haven't made the molds yet and I was looking for the ability to pour or pump the "product" in between the male and female components, into the void. Thanks. I will keep this product in mind.

I would suggest your best bet would be a microcellular PU foam, where you could adjust the density to whatever meets your sound deadening criteria. Use a meter-mix machine to mix and dispense the foam. You'd have to select from polyether-, polyester- or polycarbonate based PUs, depending on hydrolysis, thermal and physical property needs. You might also try to get some data on available commercial systems for automotive sound-deadening naterials from manufacturers such as Huntsman, or structural engineers at places like Magna International or Ashland. Solids filled liquids are also used for sound deadening.

The microcellular idea is a good one. I could also suggest such products as Smooth-On, who has a web sight.

Thanks for all of the ideas. Just to let you know I have done some homework too, and I think its only fair to tell you about the effort on my end. I do not know how much the materials will cost in the amounts needed...gallons. The products that I found were: (1) Daubert V-Damp http://www.daubertchemical.com/main.taf?p=3,4 The only problem is the Daubert product is for metals and I do not know if it works well with fiberglass. (2) Green Glue http://www.greengluecompany.com/soundproofingDampingOptions.php (3) Epoxy.com Elastomeric Coatings and Membranes http://www.epoxysystems.com/elastomeric.htm (4) Techthane Elastomers Technical Urethanes http://www.polyurethane.com/ (5) Solid Solutions Polyurethane Systems http://www.solidsolutions.com.au/view_products.php?cat=Polyurethane%20flex%20exp (6) E-A-R Specialty Composites Isoloss® HDF Polyurethane Elastomer http://www.matweb.com/search/SpecificMaterial.asp?bassnum=PEARC24 (7) there was a number 7, I cannot find it anymore. It was a coating for concrete that was also a rubber/polyurethane compound.