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equipment:storage [2018/12/16 09:07] – [Die] mcmaster | equipment:storage [2019/06/07 18:21] – [Foams] mcmaster | ||
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TLDR | TLDR | ||
- | * Small sample: | + | * Small sample |
* Individual: 1.5 mL centrifuge tube | * Individual: 1.5 mL centrifuge tube | ||
* Mass | * Mass | ||
* Gel pack: sticky surface holds securely in place | * Gel pack: sticky surface holds securely in place | ||
* Waffle pack: easier to remove, but less secure for transit | * Waffle pack: easier to remove, but less secure for transit | ||
- | * Options for large samples | + | * Large sample |
- | * Larger centrifuge tube: space inefficient | + | * Membrane box: good option. Slight surface contact, although pretty gentle |
- | * Membrane | + | * Larger centrifuge tube: space inefficient, but less expensive |
- | * ESD box: | + | * Plastic |
+ | * Gel pack: generally not recommended: | ||
===== Centrifuge tube ===== | ===== Centrifuge tube ===== | ||
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===== Blue tape ===== | ===== Blue tape ===== | ||
- | Diced wafers are usually on blue tape. Thin plastic films should stick easily to seal it up. | + | Diced wafers are usually on blue tape. Thin plastic films should stick easily to seal it up. I've been cutting the edges off to make them non-sticky and putting them in standard wafer carriers. |
- | + | ||
===== Vacuum pack ===== | ===== Vacuum pack ===== | ||
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====== Foams ====== | ====== Foams ====== | ||
+ | |||
+ | 3/8" (10 mm) thick seems to work well for putting DIPs on both sides | ||
This section was added to try to learn why some black conductive foams degrade into powder and others degrade into a (mildly corrosive?) sticky mess | This section was added to try to learn why some black conductive foams degrade into powder and others degrade into a (mildly corrosive?) sticky mess | ||
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* Insulative: surface resistance > 1 x 10 12 ohms/square | * Insulative: surface resistance > 1 x 10 12 ohms/square | ||
* Anti-static: | * Anti-static: | ||
+ | |||
+ | |||
+ | |||
+ | < | ||
+ | depends on whether you want your foam to turn to goo or powder. personally i prefer goo | ||
+ | 14:57:57 powder is open cell foam, it works as an abrasive too | ||
+ | 14:58:07 goo is closed cell foam, which is oddly slick | ||
+ | 14:58:23 after 20 years the foams disintegrate | ||
+ | 14:58:41 open cell foam turns into some sort of acid (acetic?) which will eat chip legs i think | ||
+ | 14:58:45 i don't know about closed cell | ||
+ | 14:58:56 i think closed cell disintegrates much slower but gets ' | ||
+ | </ | ||
+ | |||
+ | == Brands == | ||
+ | |||
+ | https:// | ||
+ | * Too low density to be useful | ||
+ | * Open cell | ||
+ | * Density: 1.4 lbs. cu. ft | ||
+ | * Tensile Strength (PSI): 13 | ||
+ | |||
+ | https:// | ||
+ | * Advertises for chips | ||
+ | * Closed cell | ||
+ | * Density: 1.8 pcf (28.8 kg/m3) | ||
+ | * Tensile Strength: 31 psi (215kPa) | ||
+ | |||
+ | https:// | ||
+ | * "For Use With: Pin Insertion" | ||
+ | * Density: 50kg/m³ | ||
+ | * Tensile Strength: 515KPa | ||
===== Density ===== | ===== Density ===== |