Technical Insight
How Much Laser-Marking Additive Should You Use?
Candidate controls include Antimony Tin Oxide (ATO). Select dosage with a two-stage ladder: find the lowest loading that creates a feasible laser window, then confirm margin across colour, process, geometry and lots.
Author: Aurexene Materials Engineering Team · Last updated: 2026-08-28
Quick Answer
Select dosage with a two-stage ladder: find the lowest loading that creates a feasible laser window, then confirm margin across colour, process, geometry and lots.
Evidence scope: This page provides method-conditioned engineering guidance. It does not claim that one commercial grade is a drop-in replacement, universally superior, or qualified for a finished part without matched evidence.
Problem
Select dosage with a two-stage ladder: find the lowest loading that creates a feasible laser window, then confirm margin across colour, process, geometry and lots.
The decision boundary includes the complete host formulation, colour package, supplied additive form, compounding and moulding history, part geometry, delivered laser state and the measurement method. A result is not transferable when one of those conditions changes without review.
Mechanism
Below threshold the absorber network or concentration is insufficient; above it, optical shielding, agglomeration or thermal saturation can produce diminishing returns.
Laser marking is a coupled material-and-process response. Absorption and scattering determine where energy is deposited; pulse state, focus, overlap and path determine the local history; the polymer, pigments, fillers and geometry determine whether that history creates controlled contrast or a defect.
Tradeoff
Higher dosage can raise cost and change colour, viscosity, mechanics or surface quality even when contrast is unchanged.
The useful condition is a feasible region with margin, not the single darkest coupon. Contrast, edge, surface integrity, unmarked colour, processing, mechanical function, durability and cycle time must be evaluated together.
Material Strategy
Use Black Titania and ATO as application-specific screening candidates. The list is not a performance ranking and does not establish equivalence between chemistry families.
- Freeze the host grade, colour, thickness, geometry and acceptance criteria.
- Normalize active-content and supplied-form differences or explain why another comparison basis is used.
- Screen loading and laser variables in a bounded matrix and preserve failed runs.
- Confirm the selected window across relevant lots, parts, tools and exposures.
Recommended Architectures
| Architecture | Use when | First validation gate |
|---|---|---|
| Matched baseline | The current material, colour and laser recipe require a reproducible reference. | Minimum robust additive loading |
| Bounded screening ladder | Loading, supplied form, colour or delivered laser variables must be separated. | active-content basis; loading steps; dispersion quality; process window width; non-marking property retention |
| Production confirmation | A candidate window must transfer across lots, geometry, tools or lifecycle exposures. | Margin, repeatability, failures and requalification triggers |
Controls That Must Stay Visible
| Order | Control | Review rule |
|---|---|---|
| 1 | active-content basis | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 2 | loading steps | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 3 | dispersion quality | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 4 | process window width | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
| 5 | non-marking property retention | Hold the other declared formulation, process, geometry and measurement conditions constant before attributing an effect. |
Measurement & Validation
Primary response: Minimum robust additive loading.
Method: Screen multiple loadings with replicated parameter maps; compare contrast, damage, colour and processability before production confirmation.
Report the unit or grade together with instrument or verifier geometry, specimen state, conditioning, repeats, distribution or uncertainty, failures and the acceptance limit. A scanner pass, photograph or supplier representative value is not a substitute for the declared method.
Qualification Boundary
- Record exact material and lot identities, active-content basis, carrier and colour package.
- Record compounding, drying, moulding, thickness, surface and geometry.
- Record source wavelength, pulse state, spot or focus, speed, hatch, passes, field and calibration.
- Measure marked and unmarked controls using the declared method.
- Confirm production and lifecycle variation, then define requalification triggers.
Primary Sources and Standards Boundary
- ISO/CIE 11664-4:2019 — CIE 1976 L*a*b* colour space — Defines CIELAB calculation; instrument geometry, illuminant, observer, aperture and specimen state must accompany results.
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Downloads & Engineering Support
Need to apply this boundary to a grade, formulation, test method, or production route? Discuss it with the Aurexene Materials Engineering Team.