Anyone know the Durometer spec. on one of these?
Vibration Isolation
I came across these the other day and for the price I couldn't pass up trying them. I've spent as much as $75 each for vibration isolation pucks and seen pucks going as high as $900 each. I have to say that these $0.62 wonders work as well as anything I've tried and much better than the cork ones I've seen advertised for $6-$7 each. Even though my VPI turntable has factory cones and feet I did notice an improvement in smoothness and clarity. Too few bargains in high end audio not to share. I now have these under my monoblock amps, turntable and turntable motor. Hope this helps someone looking for an inexpensive way to dampen vibration.
https://www.supplyhouse.com/DiversiTech-MP-2E-EVA-Anti-Vibration-Pad-2-x-2-x-7-8
https://www.supplyhouse.com/DiversiTech-MP-2E-EVA-Anti-Vibration-Pad-2-x-2-x-7-8
Showing 5 responses by ghosthouse
I recently contacted Diversitech (email) and asked about the Durometer spec on the 2x2" EVA (blue center) pads. Hoping for a reply. FWIW - one of our senior members had recently opined that these will do nothing for audio as they are too hard. I am not voicing an opinion in that regard. I have both blue center EVA pads as well as the cork center pads. It would be helpful to know the Durometer value and relevant Shore scale as this will allow comparison to some products from Herbie’s Audio Lab (with which some of us are more familiar). If interested see also the chart at the link below. https://www.smooth-on.com/page/durometer-shore-hardness-scale/ |
Based on information supplied by Diversitech personnel, materials used to construct EVA MP2E anti-vibration pads have hardnesses roughly comparable to Tenderfeet from Herbie’s Audio Lab. Hardness specs for Diversitech’s EVA MP2E 2”x2” anti-vibration pads are as follows: The black rubber component has a Shore A scale rating of 55 +/-7. The blue foam layer has an ASKER C rating of 70 +/- 7 [as defined by SRIS 0101 (Standard by the Society of Rubber Industry, Japan)]. Durometer values for various Herbie’s Audio Lab (HLA) components are listed on the site’s Component Isolation “home” page (see link) and are based on the Shore A scale. Values are: Tender Soft Tenderfoot 46 Extra-Firm Tenderfoot 50 Soft Fat Dot 28 Big Fat Dot 70 Since its hardness rating is based on the Shore A scale, the EVA black rubber can be directly compared to HLA products. The black rubber component of the EVA pad has a Durometer value somewhat greater (i.e., indicating it is harder) than Herbie’s Extra-Firm Tenderfoot (i.e., Shore A 55 +/-7 or 48-62 ~/> EFT 50). The hardness rating of the blue foam material is more difficult to compare directly to HLA products since it is based on something other than the Shore A scale. Using information from the Rubber Properties pdf found at the misumi-ec link below (see section labeled “Hardness images”), an ASKER C rating of 70 corresponds to a Shore A value of around 45 (ASKER C of 70 falls approximately midway between Shore A values of 40 and 50). Consequently, the blue middle layer of an EVA pad has a hardness roughly comparable to that of a Tender Soft Tenderfoot from HAL (Shore A 45 ~ 46). https://us.misumi-ec.com/pdf/fa/2010/p2121.pdf https://herbiesaudiolab.com/collections/component-isolation |
Further information from Diversitech product support staff... For EVA MP2E pads (i.e., black corrugated rubber sandwiching a blue foam core), performance is maximized when statically loaded to around 345 kPa. Vibration will not be as effectively absorbed when loads are less than this value. According to Unitconverters.net, 1 kPa is equivalent to 0.145 psi, so 345 kPa is ~50 psi. A 4 square inch (2"x2") MP2E pad therefore requires loading with 200 pounds for best performance. https://www.unitconverters.net/pressure/kpa-to-psi.htm Product specs supplied by Diversitech personnel are valid as of the date of the posts in which they are reported but going forward are subject to change. |