Last updated: 2026-09-02 · 5 min read

What Is IMDS — and What Does Your Mold Maker Need to Provide?

IMDS (International Material Data System) is the automotive industry’s database for tracking substance composition in parts — and your mold maker’s obligation is to provide the material data that feeds the system: resin grade and lot, steel composition, and any additives or coatings that contact the molded part. The molder submits the complete part composition to IMDS; the mold maker provides the component-level data that makes the submission accurate.

Cavity — The hollow space inside the mold that forms the part shape. Multi-cavity molds produce multiple parts per shot. Cavity count determines production output but also mold cost and complexity. Each cavity must be balanced for uniform fill. See also related guide.

Key Facts

  • IMDS tracks substances down to 0.1% concentration — every material in the part must be declared, including resin additives, color masterbatch, steel alloys and surface treatments.
  • The mold maker’s deliverable is the material data sheet for the tool: resin grade with supplier documentation, steel heat numbers and composition certificates, and records of any mold releases, coatings or treatments applied to the part surface.
  • IMDS compliance is a program requirement, not a mold specification — the molder owns the submission, but the mold maker’s data accuracy determines whether the submission passes or rejects.

    • Cavity — The hollow space inside the mold that forms the part shape. Multi-cavity molds produce multiple parts per shot. Cavity count determines production output but also mold cost and complexity. Each cavity must be balanced for uniform fill. The related guide covers adjacent topics.

    What IMDS Actually Tracks

    Material Category What Gets Declared
    Resin Grade designation, supplier, additive package (UV stabilizers, flame retardants, fillers)
    Color masterbatch Pigment composition, carrier resin, concentration in the final part
    Reinforcements Glass fiber percentage, mineral fillers, coupling agents
    Surface treatments Mold releases, anti-static agents, any coating that transfers to the part
    Metal inserts Alloy composition, plating or coating if present

    The Mold Maker’s Data Package

  • Resin documentation: the exact grade datasheet from the supplier, with additive percentages declared — not a generic “ABS” but the specific compound with its formulation.
  • Steel certificates: heat numbers and composition reports for the mold steel, so any tool wear particles that contact the part are traceable.
  • Process chemical records: mold releases, lubricants or anti-static sprays used during production, with their composition — because anything that transfers to the part enters the IMDS declaration.
  • Masterbatch formulation: the pigment and carrier resin composition at the dosing rate used, so the final part’s colorant content is declared accurately.
  • Insert and overmold material: if the part includes metal inserts or secondary materials, their composition certificates feed the same system.

    • Where the Submission Obligation Lands

    The molder submits to IMDS because they own the part composition — they combine resin, colorant, inserts and process chemicals into the final article. The mold maker’s role is providing accurate component data: the resin supplier’s formulation, the steel composition, the masterbatch breakdown.
    When the mold maker’s data is incomplete or generic, the molder’s IMDS submission rejects or declares conservatively, which can trigger OEM audits. The quotation should specify the data package scope — which materials the mold maker will document — so the IMDS submission has accurate inputs from day one.

    Frequently Asked Questions

    Does the mold maker need IMDS access?

    Not for submission — the molder submits — but the mold maker needs to provide data in IMDS-compatible format: substance names, CAS numbers and concentrations. Some mold makers maintain IMDS accounts to upload material data directly; others provide documentation the molder enters. Either route works; the obligation is data accuracy, not system access.

    What if the resin supplier won’t disclose additives?

    Then the resin grade cannot be IMDS-compliant — automotive OEMs require full disclosure down to 0.1%. The mold maker sources grades with complete substance declarations; generic or proprietary blends without disclosure do not qualify for IMDS submission. The material selection happens before the mold is built, not after.

    How often does IMDS data need updating?

    When the material changes — new resin lot with different additives, color reformulation, insert supplier change. The mold maker’s lot traceability system tracks which materials went into which tool, so IMDS updates are triggered by material changes, not calendar dates. Programs with long production runs audit IMDS accuracy annually.

    Key Takeaways

    1. IMDS tracks substance composition in automotive parts; the molder submits, the mold maker provides component-level material data.
    2. The mold maker’s deliverable is documentation: resin formulation, steel composition, masterbatch breakdown and process chemical records — accurate data that feeds the molder’s submission.
    3. Material selection happens before the mold is built; generic or undisclosed formulations cannot be IMDS-compliant.

    Send aCatMould your IMDS requirements, and the quotation specifies the data package scope — resin documentation, steel certificates, masterbatch formulation — so the molder’s submission has accurate inputs from the first shot, not a conservative declaration that triggers OEM audits.

    Sources
    IMDS — International Material Data System
    AIAG — material data and substance compliance
    MoldMaking Technology — automotive documentation requirements

    Sources: Plastics Technology · Plastics Technology Online · Society of Plastics Engineers (SPE) · ThomasNet