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Mineral Fill vs Glass Fill

Mineral Fill vs Glass Fill: Stiffness, Impact, and Surface Finish

When a PA or PP program needs stiffness, mineral and glass fills compete on cost, warp, and surface.

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Mineral Fill vs Glass Fill

Mineral or glass on the same base

Buyers pick mineral for cost and flatness, glass for load.

When a PA or PP program needs stiffness, mineral and glass fills compete on cost, warp, and surface.

Side by side beige mineral-filled panel and black glass-filled bracket with labels.

Glass usually wins on load-bearing brackets; mineral often wins on large flat covers.

Mixed-fill commercial grades exist; specify the exact supplier suffix.

When to specify it

Fill type checklist

Use this on RFQs and BOMs before you lock a filled grade.

  • State MD, talc, or GF percent.

  • Mark flatness-critical datums.

  • Note impact or snap zones.

  • Compare supplier price tiers qualitatively.

Trade-offs

Mineral vs glass matrix

Qualitative matrix. Confirm numbers on the supplier datasheet.

NeedMineral fillGlass fill
Flat panel warpOften goodCheck anisotropy
Highest loadModerateStrong
Surface streakChalk on glossFiber show

Routing

Same base resin

Do not swap fill type without validation.

Mineral filled

  • Cost-sensitive panels
  • Lower impact
  • Good warp on some flats

Glass filled

  • Structural brackets
  • Higher wear
  • Anisotropic shrink

RFQ

What to write on the purchase order

Clear resin callouts reduce quote iterations and T1 surprises.

  1. 1

    Pick fill family

    MD vs GF suffix.

  2. 2

    Link shrink article

    Plan dimension review.

  3. 3

    Cosmetic SPI

    Match texture.

  4. 4

    T1 both if unsure

    Quote two grades only if program allows.

FAQ

FAQ

Can I blend fills in-house?

Use supplier compounds; do not ad-mix without qualification.

Mineral in nylon gears?

Usually avoid; use POM or PA GF.

Fill and weld lines?

Both can show; gate review helps.

Related guides

Materials, comparisons, and risks

Internal links only render in cards and CTA blocks.

Next step

Get a quote with your resin specified

Upload CAD and list fill level, color, and flame filter on the instant quote platform.

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Mineral Fill vs Glass Fill: Stiffness, Impact, and Surface Finish | NetProto