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Opposite moduli expoy composite
Opposite moduli expoy composite
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Old 26th August 2006, 09:23 AM   #1
Alain Favret is offline Alain Favret  France
diyAudio Member
Join Date: Nov 2003
Default Opposite moduli expoy composite

According to Hajo Prodan, who gave this name to an epoxy, sand and rubber mix, this composite seems very promising
Please refer to:
Diyaudio The Paulinator's post
SPEAKER BUILDER 5/1996 [Aug 1996] (v.17#5) pg. 42
Added Info SPEAKER BUILDER 2/1997 [Mar 1997] (v.18#2) pg. 53

The problem: the right granulation grade is sold by tons

The rubber granules should be 4-10x smaller than sand particules. Mr Prodan was lucky, as he was living next to a tyre recycle plant .
Has anyone succeded getting some mesh 80 (granules with 0.2 mm diameter) crumb rubber ?

For the moment, I could order EPDM grabules in 30 mesh grade (0.5 mm), from Melos GmbH. This woud necessitate sand particules not smaller than 2mm. Hajo Prodan seen to have used it to 3mm sand particules. I found quartz sand (0.7-1.2mm mix) at Swiss Composite (huge catalog )

Any input welcome. Please, contact me for any info.

Best Regards,
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Old 29th August 2006, 09:57 PM   #2
Willitwork is offline Willitwork  Canada
diyAudio Member
Join Date: Aug 2006
Default Re: Opposite moduli expoy composite

Originally posted by Alain Favret
[B]The problem: the right granulation grade is sold by tons
Can we say "mass loading"
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