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Post by karma67 on Jul 8, 2022 3:56:44 GMT
thats the same with Permali,there are different grades,i'd very much like to see the info that says its only as good as ply wood. if its the info posted by dear old cats squirrel on audio qualia then he doesn't say what type of panzer or Permali he's testing or the thickness of the panzer sample.russian 7 ply is equally vague.
hardly apples for apples imo.
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Jul 8, 2022 5:57:08 GMT
thats the same with Permali,there are different grades,i'd very much like to see the info that says its only as good as ply wood. if its the info posted by dear old cats squirrel on audio qualia then he doesn't say what type of panzer or Permali he's testing or the thickness of the panzer sample.russian 7 ply is equally vague.
hardly apples for apples imo.
I don't know the source of his information to be honest, but i suspect it's unlikely to be from just one place. Eitherway, i decided against that project due to the cost of either material. |
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Post by phonomac on Jul 8, 2022 7:48:14 GMT
Had some delignit b15 panzerholz in the worksop last week, making a thorens plinth. It was only 28 ply, compared to the older offcut i had left that was 40 ply per inch. So be aware there are different grades the good stuff is 40 ply. There are two types of Panzerholz, B15 and B25. B15 starts as 1.8 mm thick sheets and B25 starts as 1.0 mm thick sheets. Both types are impregnated with phenolic resin and compressed under heat to 50% of their original thickness. The number of plies that you have in a sheet depends not only on the type but the thickness of the sheet, so 28 plies vs 40 plies is meaningless. For any of the parameters that matter for plinth making B15 and B25 are identical, there is no difference. I have made plinths to my standard layout/dimensions for SP10 Mk2 in both B15 and B25 which confirmed this to be the case. |
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Post by sq225917 on Jul 8, 2022 15:00:42 GMT
Different density and stiffness....
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Post by phonomac on Jul 8, 2022 15:28:45 GMT
Density:
B15 1.35 - 1.4 g/cm^3
B25 1.35 - 1.4 g/cm^3
Flexural strength:
B15 165 N/mm^2
B25 165 N/mm^2
Elastic modulus:
B15 17,000 N/mm^2
B25 17,000 N/mm^2
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Post by pete on Jul 8, 2022 15:52:14 GMT
Pretty similar then!  |
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Post by sq225917 on Jul 8, 2022 16:16:41 GMT
Yeh, kinda close...
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