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Expert Coating & Film Application
ASTM D823 ISO 2808

Precision Square Film Applicator QPI‑CA Series – Application:

ASTM Test Method D823

Purpose

The ASTM D823 procedure defines how to produce uniform wet films of coatings for laboratory evaluation. It ensures repeatable film thickness and surface quality for tests such as gloss, adhesion, hardness, and drying time.

Apparatus

• Precision Square Film Applicator QPI‑CA Series — high‑grade stainless‑steel applicator equipped with analog or digital micrometer heads for precise gap adjustment.

• Test substrate — glass, metal, or sealed paper panels cleaned and prepared according to coating type.

• Drawdown surface — level, vibration‑free bench or automated film‑application platform.

Procedure

Preparation

• Mix the coating thoroughly and condition it to the test temperature (typically 23 ± 2 °C).

• Clean the substrate with solvent or a lint‑free cloth.

Gap Adjustment

• Set the micrometer heads to the desired film thickness (e.g., 50 µm, 100 µm, 150 µm).

• Verify parallel alignment of the blade using calibration blocks.

Film Application

• Deposit a measured amount of coating in front of the blade.

• Draw the applicator smoothly across the substrate at a constant speed (150–300 mm/s).

• Avoid vibration or jerking motion.

Drying and Evaluation

• Allow the film to level and dry under controlled conditions.

• Measure wet and dry film thickness using a calibrated gauge.

Key Parameters

• Film uniformity tolerance: ± 2 µm for gaps ≤ 100 µm.

• Repeatability: within 1 % of target thickness.

• Surface finish: free of streaks, bubbles, or edge lift.

Engineering Insight

The ASTM method emphasizes mechanical precision and consistent drawdown speed. The QPI‑CA’s micrometer control enables engineers to reproduce identical coating thicknesses across multiple samples, ensuring reliable comparative data for formulation and quality studies.

ISO Test Method ISO 2808

Purpose

ISO 2808 specifies standardized techniques for measuring and controlling film thickness of paints, varnishes, and related coatings. When used with a micrometer‑adjustable applicator, it defines how to achieve and verify uniform wet films for laboratory testing.

Apparatus

• Precision Square Film Applicator QPI‑CA Series — adjustable doctor‑blade applicator with precision micrometer heads for controlled gap settings.

• Reference substrate — glass or metal panels conforming to ISO 1514.

• Thickness measurement tools — wet‑film combs or electronic gauges calibrated per ISO 2178 or ISO 2360.

Procedure

Calibration

• Confirm the micrometer gap using certified feeler gauges or calibration blocks.

• Record nominal gap settings and environmental conditions.

Film Application

• Apply the coating evenly across the substrate using the QPI‑CA applicator at a controlled speed.

• Maintain constant pressure and angle to ensure uniform flow.

Thickness Verification

• Immediately measure wet film thickness at multiple points.

• After drying, measure dry film thickness and compare to theoretical values.

Reporting

• Document gap setting, coating type, viscosity, substrate, ambient temperature, and humidity.

• Calculate deviation between nominal and measured thickness.

Key Parameters

• Measurement accuracy: ± 5 % of nominal thickness.

• Environmental control: 23 ± 2 °C, relative humidity 50 ± 5 %.

• Surface uniformity: no visible streaks or discontinuities.

Engineering Insight

The ISO method focuses on traceability and calibration. It ensures that every film produced with the QPI‑CA applicator can be correlated to certified measurement standards, supporting international quality assurance and cross‑laboratory reproducibility.