Comprehensive inspection is carried out for interior and exterior wall coatings as well as decoration materials in line with building material standards. Key performance indicators including adhesion, scrub resistance, alkali resistance, weather resistance, hiding power, drying time, VOC content and heavy metal content are tested. Standard testing methods evaluate overall quality and application performance of coating products, guarantee their usability and safety in construction decoration projects, meet engineering acceptance and environmental protection requirements, and support reliable project quality control.
Inspection Items
In-can state, workability, surface drying time, film appearance, contrast ratio, water resistance, alkali resistance, scrub resistance, temperature change resistance, stain resistance, low-temperature stability, water impermeability, tensile strength, elongation at break, freeze-thaw cycle resistance, salt efflorescence resistance, water permeability, thermal storage stability, low-temperature storage stability, low-temperature flexibility, standard-state tensile strength, standard-state elongation at break, bonding strength
Inspection Standards
1. GB/T 9780-2013 Test Method for Stain Resistance of Architectural Coatings
2. GB/T 9779-2015 Multi-coat Architectural Coatings
3. JG/T 26-2002 Inorganic Exterior Wall Architectural Coatings
4. JG/T 25-2017 Test Method for Temperature Change Resistance of Architectural Coatings
5. GB/T 9265-2009 Architectural Coatings - Test of Alkali Resistance
6. JC/T 1040-2007 Thermal Insulation Reflective Coatings for Building Exterior Surfaces
7. GB/T 9757-2001 Solvent-borne Exterior Wall Coatings
8. GB/T 1733-1993 Test Method for Water Resistance of Paint Films
9. GB/T 9755-2014 Synthetic Resin Emulsion Exterior Wall Coatings
10. GB/T 9266-2009 Architectural Coatings - Test of Scrub Resistance
11. JG/T 172-2014 Elastic Architectural Coatings
12. GB 1728-1979 Test Method for Drying Time of Paint and Putty Films
13. ISO 11890-1:2020 Paints and varnishes - Determination of volatile organic compound (VOC) and/or semi-volatile organic compound (SVOC) content - Part 1: VOC determination
14. ASTM D3960-05(2020) Standard Test Method for Volatile Organic Compound (VOC) Content of Paints and Related Coatings
Inspection Equipment
Adhesion tester, scrub resistance tester, weathering test chamber, drying time tester, VOC detector, heavy metal analyzer, hiding power tester, viscometer, color difference meter
Key Indicators and Inspection Requirements
1. In-can state: no caking, uniform after stirring
2. Workability: no sagging or obvious brush marks
3. Drying time: surface drying ≤ 2 h, hard drying ≤ 24 h
4. Water resistance: no abnormal change after 96 h immersion
5. Alkali resistance: no abnormal change after 48 h immersion
6. Scrub resistance: ≥2000 cycles for interior coatings, ≥5000 cycles for exterior coatings
Inspection Methods and Implementation Points
1. Conduct tests referring to GB/T 9756 and GB/T 9755
2. In-can state: visual inspection combined with manual stirring
3. Drying time test: measured by professional tester under standard ambient conditions
4. Water resistance test: immerse test panels in distilled water
5. Alkali resistance test: immerse test panels in calcium hydroxide solution
6. Scrub resistance test: run cyclic test with dedicated scrub tester
Precautions
1. Maintain test environment at (23±2)℃ and relative humidity (50±5)%
2. Ensure test panels are flat and free of surface defects
3. Keep panels stationary for 24 h recovery after water/alkali immersion tests
4. Use clean medium during scrub resistance testing
5. Test samples shall be within valid shelf life
6. Select corresponding standards according to coating categories
Note: All information above is for reference only. For further details and customized inspection solutions, please contact us at any time.
