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Epoxy Resin
Woody

Nilikha ni

Woody

22. Setyembre 2026NO
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Epoxy Resin

Pierre Castan, a Swiss chemist at the dental firm De Trey Frères, was looking for a resin for dentures. He reacted a phenol carrying two hydroxy groups with epichlorohydrin, then hardened the product with an acid anhydride, and got a hard, clear, unusually adherent solid. Ciba licensed it and sold it as Araldite; in the US Sylvan Greenlee developed epoxies independently. **US 2,324,483**, "Process of preparing synthetic resins", Castan, granted 20. July 1943, claims condensing "a polybasic carboxylic acid anhydride" with the product of "a phenol having at least two phenolic hydroxy groups and of an epichlorhydrine". It does not single out bisphenol A, the phenol most epoxies use today. **Epichlorohydrin is a carcinogen; you start from a two-part kit.** You glue pine lap joints at the right ratio and four wrong ones, then test hardness and break the joints.
Baguhan
2 hours plus 24 h cure

Mga Tagubilin

1

Cut the joint pieces

Saw ten pine strips 100 x 25 mm. Sand one face of each end with 120 grit and dust off. Label five pairs 1:1, 1.25:1, 1:1.25, 1.5:1 and 1:1.5.

Mga materyales para sa hakbang na ito:

Tablang pinoTablang pino1 piraso
Papel de LihaPapel de Liha1 pilyego
Teyp na pantakipTeyp na pantakip1 rolyo

Mga kailangang kasangkapan:

Lagaring PangkamayLagaring Pangkamay
Panukat na AseroPanukat na Asero
LapisLapis
2

Measure by syringe

Gloves on. For each ratio draw resin and hardener in separate syringes (1:1 = 2 ml + 2 ml; 1.25:1 = 2.5 + 2; and so on) into its own cup. This assumes a 1:1-by-volume kit - scale to your label.

Mga materyales para sa hakbang na ito:

Epoksing dalawang bahagiEpoksing dalawang bahagi25 ml

Mga kailangang kasangkapan:

Gwantes na NitrileGwantes na Nitrile
Set ng heringgilyaSet ng heringgilya
Mga tasang panghalong may bahagdanMga tasang panghalong may bahagdan
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
3

Mix thoroughly

Stir each cup 2 minutes, scraping the walls and bottom. Unmixed streaks behave like a wrong ratio.

Mga kailangang kasangkapan:

PanghaloPanghalo
4

Glue and pour

Spread each mix on the sanded ends of its pair, overlap them 25 mm and spring-clamp over wax paper. Pour the rest as a coin-sized puddle on wax paper beside it.

Mga materyales para sa hakbang na ito:

Papel na may pagkitPapel na may pagkit1 pilyego

Mga kailangang kasangkapan:

Ipit na may springIpit na may spring
5

Cure 24 hours

Leave everything at room temperature, 20 °C or warmer, for 24 hours. Cold slows the cure.
6

Pencil hardness

Sharpen pencils 6B to 6H and flatten the tips on 400 grit. Push each at 45° across a puddle, from hard down, until one no longer scratches. Record that grade.

Mga kailangang kasangkapan:

Hanay ng Lapis na GrapitoHanay ng Lapis na Grapito
Lupang PampalakiLupang Pampalaki
7

Break the joints

Clamp one strip of a joint in the vise and tap the free end sideways with the mallet until it breaks. Estimate how much of the bond face is torn wood.

Mga kailangang kasangkapan:

Bais sa Mesang PanggawaBais sa Mesang Panggawa
Malyong gomaMalyong goma
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
8

Ratio, leftovers, results

Naglo-load ng Jupyter notebook…
9

History & Context

**What the patent specifies:** a resin from a two-hydroxy phenol and epichlorohydrin, hardened by a polybasic acid anhydride. **Modern build (derived):** a two-part kit, most with an amine hardener that cures at room temperature. Epoxy became the glue that holds metal, the matrix of fibreglass and carbon-fibre parts, and the boat-builder's resin. Its limits: it yellows in sunlight, softens with heat, and uncured resin and hardener sensitise skin - which is why the gloves stay on every time.

Mga Materyales

5

Mga Kinakailangang Kasangkapan

13

Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

Making Bakelite — The First Fully Synthetic Plastic That Launched the Age of Polymers
Mapanganib

Making Bakelite — The First Fully Synthetic Plastic That Launched the Age of Polymers

ni CharlieDE

Industriyal

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Casting Clear Epoxy Resin Paperweights — Embedding Objects in Resin

Casting Clear Epoxy Resin Paperweights — Embedding Objects in Resin

ni MaryFI

Kemistri

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Silicone (Rochow Direct Process)

Silicone (Rochow Direct Process)

ni ClayDK

Paggawa ng Plastik

1
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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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