good-enough/core-docs/good-enough-4u0-material-passport.md

Good Enough 4u0 — Material Passport

File: good-enough-4u0-material-passport.md

Purpose

A Material Passport documents any non-standard or salvaged material used in a design. It ensures clarity, replicability, and safe substitution.

Passport Template

1. Material Name

• Common description (e.g., “Plywood offcut, ~12 mm”).

2. Source Type

• ☐ Opportunistic Salvage (one-time)
• ☐ Perennial Secondary Market (garage sale, thrift, flea)
• ☐ Industrial Junk Stream
• ☐ Other: ________

3. Physical Specs

• Dimensions (thickness, length, width).
• Weight or density (if known).
• Any markings or grades visible.

4. Substitute(s)

• At least one equivalent standard material.
• Note what changes in performance if substituted.

5. Known Limitations

• Weaknesses, environmental limits.

6. Hazards

• Sharp edges, dust, treatments, coatings, residues.

7. Visual Reference

• Sketch or photo recommended.

8. Declared Use in Design

• Component/function it supports.
• Why it was chosen (cost, availability, strength, aesthetics).

Rule of Thumb

• No Passport = No Approval for non-standard or salvaged materials.