Part of Phase 4: Village
Advanced Materials covers two unrelated material families — rubber-like latex, and a handful of plastics and resins that filled the same roles before petroleum plastics existed — plus glass blowing as a third, separate track. Rubber and Polymers is the overview article: rubber is the first flexible, waterproof, electrically insulating material a rebuilding community gets, and the twenty articles here split between where it comes from, how it’s processed, and what replaces it when a Hevea tree genuinely isn’t available.
Natural Rubber Sources makes the key point directly: rubber doesn’t come only from tropical Hevea trees — over 2,500 plant species produce latex, several growing well outside the tropics. Rubber Tree Tapping gets 40-80 mL of liquid latex per cut from a properly tapped tree, roughly 15-30 grams of dry rubber, tapped on alternate days rather than daily. Dandelion Rubber and Fig and Spurge Latex are the two temperate-climate alternatives: the Hevea tree grows only within about 10 degrees of the equator, but the common dandelion carries the same latex almost anywhere in the temperate world, and figs and spurges — two unrelated plant families — both exude a latex that processes into rubber on every inhabited continent.
Latex Processing, Latex Coagulation, Vulcanization, Rubber Processing, Rubber Coating, Rubber Products, and Rubber Hoses and Tubing cover turning that latex into something usable. Fresh latex has to be coagulated with acid within 4-6 hours of collection, or it spoils into a useless, foul mass — coagulation is what turns the milky suspension into a solid, shapeable material in the first place. Vulcanization then fixes it permanently: mixing in sulfur at about 5% by weight and heating to 140-160°C, or steam-curing at a safer 100°C for 4-8 hours instead. What comes out ranges from a brushable waterproofing coat (shredded rubber dissolved in turpentine at roughly 3 parts solvent to 1 part rubber) to pressed gasket sheet (3-4 mm for a water pipe flange, 2-3 mm but fully vulcanized for a steam engine cylinder seal) to a hose built by dipping a mandrel in rubber cement 10-20 times, each layer 0.3-0.5 mm thick.
Gutta-Percha, Alternative Polymers, Casein Extraction, Casein Plastic, Casein Formaldehyde Hardening, Shellac, Horn and Tortoiseshell, and Glass Blowing and Forming are the non-rubber tracks. Gutta-percha is chemically the same molecule as rubber, just arranged differently — rigid at room temperature, but soft and moldable above 60°C. Alternative Polymers names what filled rubber’s role before it was available: animal proteins, plant gums, shellac, and cellulose derivatives, for the same gaskets and adhesives. Casein plastic, sold commercially as Galalith, was invented in 1897 and produced by the tens of thousands of tons a year before petroleum plastics took over — curdling skim milk at 50-60°C with vinegar yields roughly 30 grams of dry casein from cow’s milk, and hardening it in a formaldehyde bath takes 3-5 days for a thin button but 2-3 months for anything over 10 mm thick. Shellac dissolves at about 200 grams of seedlac per liter of alcohol and works as an insulator good for roughly 30 kV per millimeter. Horn and Tortoiseshell takes 2-4 weeks buried in moist earth, or 2-3 hours of boiling, to separate the bony core before the softened sheath can be pressed flat into panes. Glass Blowing and Forming stands entirely apart from everything else here — it needs glass-making, kiln construction, and mold-making already in place, and it’s the only common material that’s transparent, inert, impermeable, and heat-resistant all at once.
Where Rubber Comes From
Tropical and temperate sources of natural latex, before anything gets processed.
- Rubber and Polymers
- Natural Rubber Sources
- Rubber Tree Tapping
- Dandelion Rubber
- Fig and Spurge Latex
Processing Latex into Rubber
Coagulating, curing, and shaping raw latex into coatings, gaskets, and hose.
- Latex Processing
- Latex Coagulation
- Vulcanization
- Rubber Processing
- Rubber Coating
- Rubber Products
- Rubber Hoses and Tubing
Plastics, Resins, and Glass
What filled rubber’s role before it was available, plus a material track that needs none of it.