My materials science notes

Started 13Dec2019. Updated 25Jun2020. Only a scratchpad at the moment. I am a happy materials science amateur. It is a very interesting theme: to tell about my experiences with different materials. However, it remains to be seen how this note ends. Observe Standard disclaimer since I mention companies and products here.

Alphabetical list

  • Acrylic boxes (or acrylics or polyacrylates) is a big group of different plastics: https://en.wikipedia.org/wiki/Acrylate_polymer. Also see Poly(methyl methacrylate) (PMMA) (below)
    • Such boxes, either complete with top and bottom, or just open trays are useful for making private boxes. However, they must be cast as single pieces, no gluing at the corners!
    • Åhlens in Sweden (they gave up Norway). Storage boxes (“Förvaringsask” in Swedish) as product name “Saltsjön”, in several sizes, like here. Examples: My aquarium notes and My USB watchdog (and relay output) box (also shows IKEA chopping boards cut up and used)
    • Søstrene Grene, here. Open trays (material type is not specified, but it looks and feels like acrylics, even if it says “Not suitable for food contact”). Example: My IceCore notes (23.9*11.9*3.0 cm at the bottom, about a mm wider at the top. Same for 15.5*15.5*4.6 cm. Both have feet also meant for stacking
    • IKEA box “Björnarp” (obsoleted?) is in Poly (methyl methacrylate) (PMMA): https://en.wikipedia.org/wiki/Poly(methyl_methacrylate). Example: My “Day’s End” by Jane Hart reflection
  • Chopping boards in polyethylene. The nice thing about them is their surface, which looks nice in many uses. However, they seem to get out of fashion (Jan2020), now chopping boards seem to be mede from wood. Also nice raw material!

  • Diffusers for direct lamps, like spotlights. See Wikipedia Diffuser
    • Used LED lamps with E27 sockets will often have a diffuse plastic dome. It is perfect for LED spots! See note 201
    • White foil paper. Also in note 201
  • PE-LD (LDPE): https://en.wikipedia.org/wiki/Low-density_polyethylene –
    • Sainsbury (UK), 45.5*29 cm, 9 mm thickness, white, product 124143353 (here). Harder chopping board that may break. I do not like to work with it just because I got a bad feeling. I’ll update when I have used it
    • Dalaplast (Sweden), 25*15 cm, 6.5 mm thickness, light blue, rose red, grey black, light green. These feel more like the IKEA boards made from PE-LLD (below). I’ll be back when I have used them
  • PE-LLD (LLPPE): https://en.wikipedia.org/wiki/Linear_low-density_polyethylene
    • IKEA. Polyethylene without bisphenol A (BPA). Max 70°C (dishwasher safe). Made in India (supplier number 21293, 22092). Also called “etenplast” in Norwegian
      • Example: My USB watchdog (and relay output) box. I have found no glue for it, so I have always instead screwed it or fastened parts with brass pins etc. – provided I bored a suitable hole first. If not the sheet will split up as if it were wood! However, it may be nicely cut with my Proxxon 27070 FET table saw. (I think “FET” is a German abbreviation for “Feinschnitt-Tischkreissäge” or fine-cut table saw.)
      • IKEA “Legitim” chopping boards. 34*24 cm white and green, 8 mm thickness. White (transparent look), 34*24 cm is product 902.022.68. The green I have used a lot, but is now (Jan2020) obsoleted, product 301.531.24. The last green was in a set paired with a smaller and thinner (4.5 mm thickness) blue
      • IKEA “365+” set of three chopping boards (green, red and grey/light blue), 22*16 cm, 7 mm thickness
  • Polycarbonathttps://en.wikipedia.org/wiki/Polycarbonate (Lexan) plastic sheets. May be bent into 90° angle without breaking. Mine is transparent
  • Poly(methyl methacrylate) (PMMA)
  • Polystyrene
  • POM (polyoxymethylene) solid plastic – https://en.wikipedia.org/wiki/Polyoxymethylene – may be glued with silicon onto glass. Mine is white. Example: My aquarium holiday automatic fish feeder (for granules)
  • PVC (polyvinyl chloride) plastic sheetshttps://en.wikipedia.org/wiki/Polyvinyl_chloride
    • Beautiful to work with. I have only screwed pieces together, but I think they are fine to glue as well. Some strange smell when I cut it with my table saw. Does not glue very well with silicon, i.e. very bad
    • Example: The top and the base of the aquarium: My aquarium notes
    • Like product 148-21-869 (grey) from Elfa Distrelec. No brand. 98 cm x 49 cm x 8 mm (5490 grams)
    • Like product 148-21-867 (grey) from Elfa Distrelec. No brand. 98 cm x 49 cm x 5 mm (3430 grams)
  • Screws (tiny screws)
    • Make sure not to throw away any waste electronic products before you have opened them and picked all the nice screws! There are so many different type of screws! Some times even defective E27 LED lamps will have screws (plus diffusors, see above)
  • Styrene-acrylonitrile resin (SAN)
    • This is styren-akrylnitril (SAN) from Biltema (here). They call it “plastglass” (plastic glass). It has a protective shield against UV light (which I believe is needed for polystyrene, which SAN is similar to). Wikipedia https://en.wikipedia.org/wiki/Styrene-acrylonitrile_resin. Two pieces of SAN are glued very well with silicon

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