Glass filaments woven into cloth and bonded with epoxy or polyester resin. Less stiff than carbon, much cheaper, easier to work, and the dominant composite of boat hulls, surfboards, swimming pools, wind-turbine blades. The first composite most students touch.
E-glass (electrical-grade alumina-borosilicate glass) drawn into 5–25 µm filaments, woven, and bonded with thermoset matrix (polyester for marine, epoxy for higher performance). Cheaper than carbon by an order of magnitude, with about 40% the modulus. Polyester matrix carries styrene fume during cure; epoxy is cleaner but slower.
I designed an exterior stair for a house in Casey Key, Florida, that Eric fabricated out of fiberglass in his boat shop in Bristol, Rhode Island. Located in a hurricane zone, the house's remote site is prone to extreme winds, salt water, and solar exposure. The lightweight stair made out of fiberglass weighs less than 300 pounds, can be carried by two people and transported in one piece. The tread consists of seven layers: three on top and three at the bottom with a balsawood core in the center. The stair hangs with ¼ in / 63.5 mm fiberglass rods, constructed like fishing rods, supported by the roof.
Principled BSDF defaults derived from the sphere fibrous finish. Reasonable seed for Blender, Substance, Keyshot, Rhino — tune per material. Or grab the whole library at once: ForMaterials library →
# finish: fibrous albedo #d8c890 metallic 0.00 roughness 0.32 ior 1.45 transmission 0.00 clearcoat 0.55 sheen 0.10 anisotropic 0.40
{
"albedo": "#d8c890",
"metallic": 0.0,
"roughness": 0.32,
"ior": 1.45,
"transmission": 0.0,
"clearcoat": 0.55,
"sheen": 0.1,
"anisotropic": 0.4
}
# Blender 4.x — Principled BSDF
# Fiberglass (E-Glass, in epoxy or polyester) · finish: fibrous
import bpy
mat = bpy.data.materials.new(name="mat_fiberglass_e_glass")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.6867, 0.5776, 0.2789, 1.0)
bsdf.inputs["Metallic"].default_value = 0.000
bsdf.inputs["Roughness"].default_value = 0.320
bsdf.inputs["IOR"].default_value = 1.450
bsdf.inputs["Transmission Weight"].default_value = 0.000
bsdf.inputs["Coat Weight"].default_value = 0.550
bsdf.inputs["Sheen Weight"].default_value = 0.100
bsdf.inputs["Anisotropic"].default_value = 0.400
# KeyShot 11+ — lux Python API, Generic material
# Fiberglass (E-Glass, in epoxy or polyester) · finish: fibrous
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_fiberglass_e_glass", materialType="Generic")
mat.setProperty("diffuse", (216, 200, 144)) # 8-bit sRGB
mat.setProperty("metallic", 0.000)
mat.setProperty("roughness", 0.320)
mat.setProperty("indexOfRefraction", 1.450)
mat.setProperty("transparency", 0.000)
mat.setProperty("coatingWeight", 0.550)
{
"_format": "Substance Designer / Painter \u2014 pbrMetalRough constants",
"_about": "Fiberglass (E-Glass, in epoxy or polyester) \u00b7 finish: fibrous",
"baseColor": {
"r": 0.6867,
"g": 0.5776,
"b": 0.2789
},
"metallic": 0.0,
"roughness": 0.32,
"ior": 1.45,
"opacity": 1.0,
"anisotropyLevel": 0.4,
"_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_fiberglass_e_glass",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.6867,
0.5776,
0.2789,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.32
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
},
"KHR_materials_clearcoat": {
"clearcoatFactor": 0.55
},
"KHR_materials_sheen": {
"sheenColorFactor": [
1.0,
1.0,
1.0
],
"sheenRoughnessFactor": 0.1
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# Fiberglass (E-Glass, in epoxy or polyester) · finish: fibrous
def Material "mat_fiberglass_e_glass" {
token outputs:surface.connect = </mat_fiberglass_e_glass/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.6867, 0.5776, 0.2789)
float inputs:metallic = 0.000
float inputs:roughness = 0.320
float inputs:ior = 1.450
float inputs:opacity = 1.000
float inputs:clearcoat = 0.550
token outputs:surface
}
}
WARNING: cured fiberglass dust requires P100 respirator + HEPA collection. Tools dull faster than on metal due to abrasive glass fibers. Cleanest cuts come from sharp 4-flute carbide; HSS not recommended.
Sandvik composite-machining guide (GFRP / fiberglass); Owens Corning E-glass machining notes; OSHA respirable-fiber guidance.
→ try this material in swarfOwens Corning E-glass technical literature; ASM Handbook Vol. 21 Composites.
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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