The bioplastic that actually biodegrades in seawater. Standard PLA — the common 3D-printer filament and biodegradable cup material — only biodegrades under industrial composting conditions (60+ °C for weeks). In ambient temperature soil, river, or ocean it persists almost as long as conventional plastic. Marine-degradable PLA is a blend of PLA with a biodegradable polyester (typically polybutylene succinate, PBS, or polyhydroxyalkanoate, PHA) that lowers the degradation activation energy and lets the material break down in seawater within months rather than centuries. The application canon is single-use marine-environment products (fishing-gear components, beach-environment packaging, boat-equipment cushioning) and food-service items in coastal-disposal environments. Less mature than standard PLA — supply is concentrated in a few specialty producers (Mango Materials, Danimer Scientific Nodax, NaturePlast). Buy from MatterHackers (3D-print filament grade), Danimer / Mango directly for industrial volumes.
Polymer blend, primary phase polylactic acid (PLA, structural unit -[O-CH(CH3)-CO]n-) + secondary phase a biodegradable polyester (polybutylene succinate PBS, polyhydroxyalkanoate PHA, or polybutylene adipate terephthalate PBAT) at 10-40 percent by weight. The secondary polyester both plasticizes PLA (improves toughness) and provides the marine-biodegradation pathway (the unblended PLA is hydrolytically degradable but very slowly under seawater conditions; the blended polyester degrades by enzymatic / microbial pathways much faster). Density 1250-1400 kg/m³ depending on blend ratio. Tensile strength 30-55 MPa (lower than neat PLA because of the toughening blend). Tensile modulus 2.0-3.5 GPa. Elongation at break 20-200 percent depending on blend (much higher than the brittle 3-8 percent of neat PLA). Glass transition Tg 50-60 °C. Marine biodegradation per ASTM D6691 (marine biodegradation under controlled-laboratory conditions): typical 50-80 percent mineralization within 180 days at 30 °C in sea-water-and-sediment systems. Industrial composting per ASTM D6400 (the standard PLA cert) typically also satisfied. Processes by injection molding, FDM 3D printing, blown-film extrusion, thermoforming with parameters similar to neat PLA but with the lower-temperature processing window of the blend (190-210 °C nozzle for FDM vs. 200-220 for neat PLA).
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 #e8e0d0 metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#e8e0d0",
"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
# PLA (Marine-Degradable Variant, BioPBS / Mango Materials Blend) · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_pla_marine_degradable")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.807, 0.7454, 0.6308, 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
# PLA (Marine-Degradable Variant, BioPBS / Mango Materials Blend) · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_pla_marine_degradable", materialType="Generic")
mat.setProperty("diffuse", (232, 224, 208)) # 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": "PLA (Marine-Degradable Variant, BioPBS / Mango Materials Blend) \u00b7 finish: matte",
"baseColor": {
"r": 0.807,
"g": 0.7454,
"b": 0.6308
},
"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_pla_marine_degradable",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.807,
0.7454,
0.6308,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# PLA (Marine-Degradable Variant, BioPBS / Mango Materials Blend) · finish: matte
def Material "mat_pla_marine_degradable" {
token outputs:surface.connect = </mat_pla_marine_degradable/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.807, 0.7454, 0.6308)
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
}
}
Marine biodegradation standards (ASTM D7991, ISO 18830); Notpla / Genecis marine-biodegradable PLA 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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