Ok, I know. I rarely post just - hit you up with some weird questions now and again so here's another one.
Can anyone find a list of materials and their respective area densities? I've been googling and wikipediaing for the last I dunno how many hours and can't find a list. Not even any of the manufacturers I've gone to have the kg/m^2 listed in their specs. (Although, many of the list bulk density.)
Follow-up question: Can you convert (kg/m^3) to (kg/m^2) by taking the cube root and squaring it?
Why do I need to know? I'm writing a program I hope to share with you guys that will do a number of things for small room design. The standard I've found requires that the calculations for the transmission loss of a partition and subsequently the sound transmission class (bah...) include the mass per unit area of the partition. Thus, I need a list, if there is one, of materials and their respective masses per unit area. If I can't find it I'll take the easy way out and use the empirical data I've found in a few studies but having the program run the calculations for you would, in my mind, be much better.
Apologies for the length,
Ponch.
Mass per unit Area
Originally posted at johnlsayers.com, topic 8486.
:) You just multiply the kg/m3 with the thickness expressed in m Hence: a panel of 12.5 mm = kg/m3 x 0.0125 a wall of 20 cm = kg/m3 x 0.2 Search for: "density different materials metric" which results e.g. in: http://www.simetric.co.uk/si_materials.htm But you still have to be careful: Gypsum board depending on type and brand can vary from 680 to 1075 kg/m3 (maybe wider). A brick wall can vary a lot in density. Wood can differ a lot between types. (there are also sub-links in the above link) And so on ........ Eric PS: and if you find a standard: refer clearly in your calculation document to this and possible additional other sources. .Follow-up question: Can you convert (kg/m^3) to (kg/m^2) by taking the cube root and squaring it?
yup. basic math :)
m3 is 1mx1mx1m
for example:
Gypsum has a density of about 800kg/m3, just like MDF
a 12,5mm (12,5 x 10-3 m) gypsum board than has a density of 800/1000*12=10kg/m2
a 15mm MDF board has a density of 800/1000*15=12kg/m2
:)
:mrgreen: Ro, Just teasing, I know here's just some typo. But as you wrote it here, it's indeed basic math (????), a bit toooo basic. :)yup. basic math :) m2 is 1mx1mx1m
Yeah it seems obvious I guess when you say it. For the record though, consulting a math major did not help me. He said ultimately that he didn't know. ha.
:mrgreen: - must have been drunk or something ....
yuh, haha. fixed the typo... sorry :):mrgreen: Ro, Just teasing, I know here's just some typo. But as you wrote it here, it's indeed basic math (????), a bit toooo basic. :)yup. basic math :) m2 is 1mx1mx1m