LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Epoxy Resin
Woody

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Woody

22. september 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.
Byrjandi
2 hours plus 24 h cure

Leiðbeiningar

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.

Efni fyrir þetta skref:

FuruborðFuruborð1 stykki
SandpappírSandpappír1 plata
MálningarlímbandMálningarlímband1 rúlla

Nauðsynleg verkfæri:

HandsögHandsög
StálreglustikaStálreglustika
BlýanturBlýantur
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.

Efni fyrir þetta skref:

Tveggja þátta epoxýTveggja þátta epoxý25 ml

Nauðsynleg verkfæri:

NítrílhanskarNítrílhanskar
SprautusettSprautusett
Mæligraduð blöndunarglösMæligraduð blöndunarglös
Tær öryggisglerauguTær öryggisgleraugu
3

Mix thoroughly

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

Nauðsynleg verkfæri:

HrærusprotiHrærusproti
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.

Efni fyrir þetta skref:

VaxpappírVaxpappír1 plata

Nauðsynleg verkfæri:

FjaðurklemmaFjaðurklemma
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.

Nauðsynleg verkfæri:

Blýantasett úr grafítiBlýantasett úr grafíti
StækkunarlúpaStækkunarlúpa
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.

Nauðsynleg verkfæri:

SkrúfstykkiSkrúfstykki
GúmmíhamarGúmmíhamar
Tær öryggisglerauguTær öryggisgleraugu
8

Ratio, leftovers, results

Hleð Jupyter-vinnubók…
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.

Efni

5

Nauðsynleg verkfæri

13

Tengd Blueprint

Þessi blueprint deila þekkingu — tækni, efni eða meginreglur

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

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

eftir CharlieDE

Iðnaður

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Casting Clear Epoxy Resin Paperweights — Embedding Objects in Resin

Casting Clear Epoxy Resin Paperweights — Embedding Objects in Resin

eftir MaryFI

Efnafræði

70
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Silicone (Rochow Direct Process)

Silicone (Rochow Direct Process)

eftir ClayDK

Plastgerð

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CC0 opinbert ríki

Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.

Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.

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