multifunctional scratch tester testing principle

　　The multifunctional scratch tester integrates the hundred grid scratch method and the five finger scratch method to test the scratch performance of automotive interior and exterior materials.

　　Applicable scope:

　　Plastics,rubber,leather,fabrics,coating materials,non coating materials,composite materials,paints,inks,soft metals,etc.

　　Applicable standards:

　　PV3952,PV3974,GMW14688,GMW14698-A,FordBN108-13,GeneralMotorsGMN3943,Danmler ChryslerLP-463DD-18-01,GB2918,GB6151,GB8424.3,BMWGS97034,STD1024-3113

　　Principle of hundred grid scratch test:

　　Mainly represented by General GMW14688 and Volkswagen PV3952,a metal scraper with a certain diameter(usually 0.5mm or 1mm)is used to scrape two sets of parallel scratches perpendicular to each other on the surface of the product with a force of 5-15N.Then,the color difference or blackness changes in the scratch area before and after scraping are measured to evaluate the scratch resistance of the material.

　　Principle of Five Finger Scratch Test:

　　Fix the sample on the test bench,with one end of the scraping rod fixed with tungsten carbide material and a highly polished scraping head with a diameter of 1mm or 7mm.The other end of the scraping rod is fixed with a weight.The installation position,quantity,and load of the scraping rod are determined based on the sample size and testing requirements.The scraping distance is generally set at 100mm to 200mm,and the scraping speed is 100mm/s.After the test is completed,visually inspect the scratches under bright northern sky sunlight or D65 standard light source,Evaluate the scratch resistance of the material.