Differences

This shows you the differences between two versions of the page.

--- equipment:storage [2019/06/07 17:46] – mcmaster
+++ equipment:storage [2019/07/05 18:25] – mcmaster
@@ Line 175: / Line 175: @@
-https://www.zoro.com/zoro-select-foam-sheet-36-l-36-w-38-pink-5gdc4/i/G1112921/
-  * Too low density to be useful
-  * Open cell
-  * 1.4 lbs. cu. ft
 <code>
 depends on whether you want your foam to turn to goo or powder. personally i prefer goo
-:57:57 powder is open cell foam, it works as an abrasive too
+powder is open cell foam, it works as an abrasive too
-:58:07 goo is closed cell foam, which is oddly slick
+goo is closed cell foam, which is oddly slick
-:58:23 after 20 years the foams disintegrate
+after 20 years the foams disintegrate
-:58:41 open cell foam turns into some sort of acid (acetic?) which will eat chip legs i think
+open cell foam turns into some sort of acid (acetic?) which will eat chip legs i think
-:58:45 i don't know about closed cell
+i don't know about closed cell
-:58:56 i think closed cell disintegrates much slower but gets 'sticky'
+i think closed cell disintegrates much slower but gets 'sticky'
 </code>
+[Lord_Nightmware IIRC]
+<code>
+The open cell foam is very likely polyurethane foam†, which degrades into a powder
+(clumps if compressed) primarily via hydrolysis / photo-oxidation depending on the type¹
+and (assuming polyester-based PU) releases mainly adipic acid, which is corrosive².
+†) general consideration of properties, and a few very rough tests such as:
+heating (chars: thermoset polymer), comparison against known PU foam; with supportive results.
+https://sci-hub.tw/10.1016/j.chroma.2011.05.013
+https://sci-hub.tw/10.2307/20619421
+</code>
+[[https://twitter.com/0Ekho/status/1147145691417853954|Source]]
+== Brands ==
+https://www.zoro.com/zoro-select-foam-sheet-36-l-36-w-38-pink-5gdc4/i/G1112921/
+  * Too low density to be useful
+  * Open cell
+  * Density: 1.4 lbs. cu. ft
+  * Tensile Strength (PSI): 13
+https://www.all-spec.com/Catalog/Static-Control/ESD-Safe-Cushioning-Materials/ESD-Safe-Foams/750-2436
+  * Advertises for chips
+  * Closed cell
+  * Density: 1.8 pcf (28.8 kg/m3)
+  * Tensile Strength: 31 psi (215kPa)
+https://www.all-spec.com/Catalog/Static-Control/ESD-Safe-Cushioning-Materials/ESD-Safe-Foams/713-2935
+  * "For Use With: Pin Insertion"
+  * Density: 50kg/m³
+  * Tensile Strength: 515KPa
 ===== Density =====