The black or gray rubber of every gasket, every weather-strip, every wetsuit foam (the foamed version is in the textile library), every hose, every electrical-insulation jacket. Polychloroprene rubber, brand-named Neoprene by DuPont in 1931, was the first commercial synthetic rubber and the ground-truth substitute for natural rubber wherever oil resistance, weather resistance, or cold resistance mattered. The signature properties: holds its elastomeric hand from -40 °C to +120 °C, resists ozone and UV (natural rubber cracks under both), resists oils and many solvents (where natural rubber dissolves), and bonds to metal substrates with industrial adhesives that natural rubber won't take. Classified as a 'specialty rubber' — more expensive than natural or SBR, less expensive than silicone or fluorocarbon. Buy as solid sheet stock from McMaster, as gasket dies / strip stock from gasket houses (Rogers Industries, Gardico, Atlantic Gasket).
Synthetic elastomer, structural unit -[CH2-CCl=CH-CH2]n-, polymerized from chloroprene monomer (2-chloro-1,3-butadiene). Density 1230 kg/m³ unfilled (filled gasket-grade may be 1300-1500 kg/m³ depending on filler). Hardness Shore A 30-90 across grades (medium-hard 50-70 is the gasket / weatherstrip canon). Tensile strength 17-28 MPa. Elongation at break 500-700 percent. Compression set 25-50 percent at 22 hours / 70 °C / 25 percent strain (low — keeps its sealing force over time, the gasket-property). Operating temperature -40 to +120 °C. Resists oils (mineral, vegetable, animal), most solvents, weak acids and alkalis, ozone, sunlight, weathering. Vulnerable to ketones (acetone, MEK), esters, chlorinated solvents, aromatic hydrocarbons. Vulcanizes with sulfur or metallic-oxide cure systems; the metallic-oxide systems give better heat aging and color (lighter shades possible). Bonds to metal substrates with industrial adhesives (3M Scotch-Weld, Lord Chemlok). Resin identification: not part of the consumer recycling stream; industrial rubber recycling exists for tire-and-gasket scrap.
Principled BSDF defaults derived from the sphere matte finish. Reasonable seed for Blender, Substance, Keyshot, Rhino — tune per material. Or grab the whole library at once: ForMaterials library →
# finish: matte albedo #1c1c1e metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#1c1c1e",
"metallic": 0.0,
"roughness": 0.75,
"ior": 1.45,
"transmission": 0.0,
"clearcoat": 0.0,
"sheen": 0.0,
"anisotropic": 0.0
}
# Blender 4.x — Principled BSDF
# Neoprene Rubber (Polychloroprene Solid Sheet / Gasket Grade) · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_neoprene_rubber")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.0116, 0.0116, 0.013, 1.0)
bsdf.inputs["Metallic"].default_value = 0.000
bsdf.inputs["Roughness"].default_value = 0.750
bsdf.inputs["IOR"].default_value = 1.450
bsdf.inputs["Transmission Weight"].default_value = 0.000
bsdf.inputs["Coat Weight"].default_value = 0.000
bsdf.inputs["Sheen Weight"].default_value = 0.000
bsdf.inputs["Anisotropic"].default_value = 0.000
# KeyShot 11+ — lux Python API, Generic material
# Neoprene Rubber (Polychloroprene Solid Sheet / Gasket Grade) · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_neoprene_rubber", materialType="Generic")
mat.setProperty("diffuse", (28, 28, 30)) # 8-bit sRGB
mat.setProperty("metallic", 0.000)
mat.setProperty("roughness", 0.750)
mat.setProperty("indexOfRefraction", 1.450)
mat.setProperty("transparency", 0.000)
mat.setProperty("coatingWeight", 0.000)
{
"_format": "Substance Designer / Painter \u2014 pbrMetalRough constants",
"_about": "Neoprene Rubber (Polychloroprene Solid Sheet / Gasket Grade) \u00b7 finish: matte",
"baseColor": {
"r": 0.0116,
"g": 0.0116,
"b": 0.013
},
"metallic": 0.0,
"roughness": 0.75,
"ior": 1.45,
"opacity": 1.0,
"anisotropyLevel": 0.0,
"_notes": "Channels listed are the standard Substance pbrMetalRough output. Drop into a Uniform Color node per channel, or as the constant input on a layered stack."
}{
"asset": {
"version": "2.0",
"generator": "ForMatter"
},
"materials": [
{
"name": "mat_neoprene_rubber",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.0116,
0.0116,
0.013,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# Neoprene Rubber (Polychloroprene Solid Sheet / Gasket Grade) · finish: matte
def Material "mat_neoprene_rubber" {
token outputs:surface.connect = </mat_neoprene_rubber/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.0116, 0.0116, 0.013)
float inputs:metallic = 0.000
float inputs:roughness = 0.750
float inputs:ior = 1.450
float inputs:opacity = 1.000
float inputs:clearcoat = 0.000
token outputs:surface
}
}
Lanxess / DuPont neoprene technical literature; ASTM D2000.
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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