Introduction to Routine Mandatory Test Items for Coating R&D Laboratory

(International Standard Version: ISO & ASTM D Standards, for overseas SOP & quotation documents)

1. Overview

This document covers all essential routine testing items for a full-function coating R&D laboratory, divided into seven major modules: liquid coating physical & chemical properties, application performance, film appearance & optical properties, mechanical film performance, medium resistance & durability, environmental hazardous substances, and raw material inspection. All test methods adopt internationally recognized ISO and ASTM D standards, applicable to architectural coatings, industrial protective coatings, powder coatings and solvent-borne coatingsISO.

2. Seven Categories of Test Items (Full English Text + Corresponding Standards)

Category 1: Liquid Coating Basic Physical & Chemical Properties

Used to verify raw material dispersion, storage stability and basic formulation parameters before applicationASTM Inter....

1. Fineness of Dispersion: ISO 1524 / ASTM D1210
2. Viscosity (Cup Method): ISO 2431 / ASTM D1200
3. Density: ISO 2811 / ASTM D1475
4. Storage Stability (Container Stability): ISO 11664 / ASTM D869
5. Solid Content (Non-Volatile Matter): ISO 3251 / ASTM D2369
6. Flash Point: ISO 1523 / ASTM D93
7. Water Content: ISO 760 / ASTM D1364
8. pH Value: ISO 17190 / ASTM E70
9. Sagging Resistance: ISO 16276 / ASTM D4400
10. Skinning Tendency: ASTM D1640

Category 2: Construction & Application Performance

Evaluate spraying, brushing, rolling and film-forming behaviors under construction conditionsISO.

1. Wet Film Thickness: ISO 2808 / ASTM D1005
2. Dry Film Thickness: ISO 2808 / ASTM D6132
3. Hiding Power (Opacity): ISO 6504 / ASTM D2805
4. Leveling Property: ISO 10564 / ASTM D4062
5. Sagging & Pinhole Resistance: ISO 16276 / ASTM D4400
6. Drying Time (Touch Dry / Hard Dry): ISO 9117 / ASTM D1640
7. Spraying Atomization & Overspray Performance: ISO 28199
8. Brushability & Roller Application Performance: ASTM D3730

Category 3: Dry Film Appearance & Optical Properties

Visual and instrumental evaluation of finished coating appearanceISO.

1. Gloss (20°/60°/85°): ISO 2813 / ASTM D523
2. Color Difference & Color Measurement: ISO 7724 / ASTM D2244
3. Visual Defect Assessment (blisters, craters, mottling): ISO 4628 / ASTM D714
4. Yellowness Index: ASTM E313
5. Orange Peel & Surface Texture: ISO 28199 / ASTM D4587

Category 4: Coating Mechanical Properties

Test mechanical resistance after full curingISO.

1. Cross-Cut Adhesion: ISO 2409 / ASTM D3359
2. Pull-Off Adhesion: ISO 4624 / ASTM D4541
3. Pencil Hardness: ISO 15184 / ASTM D3363
4. Impact Resistance: ISO 6272 / ASTM D2794
5. Conical Mandrel Bend Test (Flexibility): ISO 6860 / ASTM D522
6. Taber Abrasion Resistance: ISO 7784-2 / ASTM D4060
7. Scratch Resistance: ISO 1518-1 / ASTM D7027

Category 5: Medium Resistance & Weathering Durability

Accelerated aging and chemical resistance for outdoor & industrial service life.

1. Water Immersion Resistance: ISO 2812-2 / ASTM D870
2. Humidity Resistance (Condensation): ISO 6270-2 / ASTM D2247
3. Neutral Salt Spray Corrosion Test: ISO 7253 / ASTM B117
4. Acid & Alkali Resistance (Spot & Immersion): ISO 2812-1 / ASTM D1308
5. Solvent Resistance (MEK Rub Test): ISO 2812-1 / ASTM D4752
6. Xenon Arc Weathering (Light Aging): ISO 16474-2 / ASTM G155
7. UV Fluorescent Lamp Aging: ISO 16474-3 / ASTM G154
8. Heat Resistance & Thermal Cycling: ISO 12572 / ASTM D2485
9. Mold & Mildew Resistance: ISO 846 / ASTM D3273
10. Cyclic Corrosion Test: ISO 11997-1 / ASTM G85

Category 6: Environmental & Hazardous Substance Testing

Meet EU REACH, RoHS, VOC & US EPA regulatory requirementsASTM Inter....

1. VOC Content: ISO 11890 / ASTM D3960
2. Heavy Metals (Pb, Cd, Hg, Cr⁶⁺): ISO 11885 / ASTM E1613
3. Free Formaldehyde: ISO 14184 / ASTM D6007
4. Free Diisocyanate Content: ISO 10283 / ASTM D3451
5. Benzene & Aromatic Hydrocarbons: ASTM D6209
6. Halogen Content (Cl, Br): IEC 61249 / ASTM D5108
7. RoHS Restricted Substances Screening
8. PAHs (Polycyclic Aromatic Hydrocarbons): ISO 13877
9. Odor Evaluation: ASTM E544

Category 7: Raw Material Incoming Inspection (QC for Formulation Raw Materials)

1. Pigment Fineness & Oil Absorption: ISO 787 / ASTM D281
2. Resin Solid Content & Viscosity: ISO 3251 / ASTM D2196
3. Filler Moisture & Particle Size Distribution: ISO 787 / ASTM D1514
4. Solvent Purity & Water Content: ISO 760 / ASTM D1364
5. Dispersant Surface Tension: ISO 1409 / ASTM D1331
6. Additive Compatibility & Stability Test

3. General Test Evaluation Rules

All test evaluations follow ISO 4628 and ASTM D714 to grade coating defects (blistering, rusting, cracking, delamination). Pass/fail criteria shall be defined according to product specifications, customer technical agreements or international product standards (ISO 12944 for protective coatings, ISO 13000 for architectural coatings)ISO.

4. Supplementary Note

This list covers all routine mandatory items for R&D formulation development, batch trial production and pre-shipment quality verification. The test scope can be expanded to include anti-graffiti, anti-slip, fire resistance and food contact safety upon special project requirements.