The model-shop staple. The cabinet-grade panel that takes paint like nothing else, that mills cleanly on the CNC, that reads as a perfectly uniform substrate when you need a plain-painted surface. MDF is engineered wood — fine wood fibers from softwood pulp mixed with urea-formaldehyde resin and wax, pressed under heat into smooth dense panels (typically 4x8 ft, thicknesses 1/4 to 1 inch). The signature properties are absolute uniformity (no grain, no knots, no joints — the panel is the same in every direction), tight tolerance (CNC routes a clean edge that needs no sanding), and excellent paint adhesion (the dense smooth face primes and finishes to a mirror without raised grain). The downsides are weight (MDF is heavy for its volume), water-vulnerability (any water exposure swells the panel irreversibly), and the formaldehyde concern (older MDF off-gasses formaldehyde; CARB Phase 2 / TSCA Title VI compliant grades since the 2010s use lower-emission resins). Buy from Home Depot / Lowe's for construction grade, from Plywood and Door / specialty plywood dealers for premium MR (moisture-resistant) and FR (fire-rated) grades.
Engineered wood panel, ~85 percent fine wood fiber (typically softwood — pine, spruce, fir pulp) + ~9 percent urea-formaldehyde resin (or melamine-urea, MDI for MR grades) + paraffin wax + minor additives. Density 600–800 kg/m³ — the 'medium' designation distinguishes from particleboard (lower density) and HDF (higher density, used as door skins). Standard panel thicknesses 1/4, 3/8, 1/2, 5/8, 3/4, 1 inch (6, 9, 12, 16, 19, 25 mm). Modulus of rupture 25–35 MPa. Internal bond strength (the property that determines how well screws hold in MDF edges) 0.6–1.2 MPa. Linear expansion under moisture is the signature failure mode — 0.3 percent length change per 1 percent change in equilibrium moisture content, with irreversible swell on direct water contact. Surface is dense and smooth straight off the press, machines cleanly with carbide router bits at moderate speeds (the wood-fiber + resin matrix dulls steel quickly; carbide is non-negotiable). Paints with primer + topcoat to a mirror finish; the cut edge is more porous and needs separate edge-treatment (sanding sealer + extra primer coat) to match face quality. Screws hold moderately into face, weakly into edge — wood inserts or specialty MDF screws are required for any structural connection. Cuts cleanly with sharp blades, generates fine dust at high volumes (respiratory protection essential).
As the humidity affects the properties of massive wood, the use of plywood, chipboard, or MDF — materials made to limit the movement of the fibers — can be of great help to take shortcuts. A cabinet drawer made from massive wood requires a lot of knowledge of the wood's properties, whereas the equivalent made from plywood less so.
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 #9a7858 metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#9a7858",
"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
# MDF (Medium-Density Fiberboard) · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_mdf_medium")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.3231, 0.1878, 0.0976, 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
# MDF (Medium-Density Fiberboard) · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_mdf_medium", materialType="Generic")
mat.setProperty("diffuse", (154, 120, 88)) # 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": "MDF (Medium-Density Fiberboard) \u00b7 finish: matte",
"baseColor": {
"r": 0.3231,
"g": 0.1878,
"b": 0.0976
},
"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_mdf_medium",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.3231,
0.1878,
0.0976,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# MDF (Medium-Density Fiberboard) · finish: matte
def Material "mat_mdf_medium" {
token outputs:surface.connect = </mat_mdf_medium/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.3231, 0.1878, 0.0976)
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
}
}
The model-shop staple. Mills cleanly with sharp carbide; carbide non-negotiable (steel dulls in minutes against wood-fiber + resin matrix). Edges accept paint after sanding-sealer + primer. Use the swarf 'pocket' op with the 1/4 endmill for relief milling, 'contour' with the 1/8 ball for sculpted surfaces. The model-shop bench reference for paint-grade prototypes.
Onsrud Cutter MDF feeds & speeds; CARB Phase 2 dust-handling guidance; ShopBot Forum MDF best-practices.
→ try this material in swarfWood Handbook engineered-panel section; CARB Phase 2 ATCM 93120; TSCA Title VI EPA composite-wood-products rule.
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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