The soft-touch over-mold rubber on every modern toothbrush handle, every power-tool grip, every TPU phone case (the related TPU chemistry is in its own entry — TPE here is the styrenic family), every soft-touch dial / button / grommet on consumer electronics. TPE is the umbrella term for elastomers that process like thermoplastics — they're solid at room temperature with rubbery hand, but melt at a defined temperature for injection-molding (~150-220 °C depending on grade), unlike thermoset rubber (neoprene, EPDM, silicone) which cures irreversibly in the mold and cannot be remelted. The big design advantage: TPE injection-molds onto rigid substrate (ABS, PC, PP) in a two-shot process, producing the canonical hard-plastic-with-soft-grip-zone product without secondary assembly. Buy from McMaster for sheet stock, from compounders (Kraton, Teknor Apex, RTP) for injection-grade pellets, from converters for finished overmold parts.
Block copolymer thermoplastic, the styrenic family the dominant subset: SBS (styrene-butadiene-styrene), SEBS (styrene-ethylene-butylene-styrene — the saturated cousin, more weather-resistant), SIS (styrene-isoprene-styrene). The block structure is rigid styrene end-blocks tied by flexible elastomer mid-block, and the styrene blocks aggregate into hard nano-domains at room temperature that crosslink the soft mid-blocks into a rubber network — the rubber-without-vulcanization trick. Melt the styrene domains above ~150 °C and the rubber flows like a thermoplastic. Density 880-1200 kg/m³ depending on filler. Hardness Shore A 30-90 covering the soft-grip range. Tensile strength 5-20 MPa. Elongation at break 400-900 percent. Operating temperature -40 to +80 °C (the styrene-domain melt is the upper limit). SEBS grades are weather-resistant; SBS / SIS grades are not (the unsaturated mid-block oxidizes under UV). Other TPE families: TPU (thermoplastic polyurethane — separate entry, mat_polyurethane_tpu), TPV (thermoplastic vulcanizate, e.g., Santoprene — dynamically crosslinked rubber-in-PP matrix, automotive seal canon), TPO (thermoplastic polyolefin — automotive bumper canon), COPE (copolyester, specialty), COPA (copolyamide, specialty). Resin identification: typically not in the standard recycling stream because of the multi-material blend nature.
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 #3a3a3d metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#3a3a3d",
"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
# TPE (Thermoplastic Elastomer, SEBS / SBS Family) · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_tpe_thermoplastic_elastomer")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.0423, 0.0423, 0.0467, 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
# TPE (Thermoplastic Elastomer, SEBS / SBS Family) · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_tpe_thermoplastic_elastomer", materialType="Generic")
mat.setProperty("diffuse", (58, 58, 61)) # 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": "TPE (Thermoplastic Elastomer, SEBS / SBS Family) \u00b7 finish: matte",
"baseColor": {
"r": 0.0423,
"g": 0.0423,
"b": 0.0467
},
"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_tpe_thermoplastic_elastomer",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.0423,
0.0423,
0.0467,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# TPE (Thermoplastic Elastomer, SEBS / SBS Family) · finish: matte
def Material "mat_tpe_thermoplastic_elastomer" {
token outputs:surface.connect = </mat_tpe_thermoplastic_elastomer/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.0423, 0.0423, 0.0467)
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
}
}
Kraiburg / Teknor Apex TPE technical literature.
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, with cost-over-volume curves, trade-off profiles, equipment-tier filters, and second-life paths layered onto the data 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's Material World on raw materials, Lefteri's Making It on processes, Forty's Concrete and Culture, Sparke's Design in Context, Bürdek's Design: History, Theory and Practice of Product Design, Schröpfer's Material Design on materials in architecture, Winchester's The Perfectionists on tolerance, Minshall's Your Life Is Manufactured on the global supply chain, von Busch's Making Trouble on material activism, Were's How Materials Matter, Hegger / Drexler / Zeumer's Basics Materials, Untracht and McCreight on metalsmithing, USDA Forest Products Lab on woods, GIA on gemstones, Schott / CoorsTek / Toray / Owens Corning datasheets, MakeItFrom for verifiable property numbers, ASM Handbook, ISO standards. Museum holdings draw from the Met, MAD, V&A, Smithsonian American Art Museum, Newark Museum of Art, British Museum, Heard Museum, Smithsonian NMAI, Eiteljorg Museum, Philadelphia Museum of Art, Cranbrook Art Museum, and Grand Rapids Art Museum — collection-record permalinks only, designer overview pages and exhibition listings excluded. Voice blocks now ride on every entry kind — material, process, application, and finish — and include Ruskin on iron, Anni Albers on twining, Greg Lynn on the shred-and-teeth NURBS lineage, Pugin on the metal that won't be hammered, Barthes / Yanagi / Benjamin channeled within their philosophy; Sparke, Bürdek, Forty, Conway, Schröpfer, Minshall, von Busch, Lefteri, Pat Pruitt, Mary Lee Hu, Tom Joyce, Albert Paley, and the rest of the contemporary makers quoted verbatim with citation. All cited.
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