Automatic Scratch Tester

     Coatings and paints can protect,decorate substrate or conceal the defects of substrate, and these three functions are related with coatings hardness. And hardness is the important performance for paint mechanical strength, as well as the important indicator to judge paint quality. One of important indicators to evaluate coatings hardness is scratch resistance.

    ISO 1518 《Paints and varnishes -- Determination of scratch resistance》specifies a test method for determining under defined conditions the resistance of a single coating or a multi-coat system of paint, varnish or related product to penetration by scratching with a scratch stylus loaded witha specified load. Penetration of the stylus is to the substrate, except in the case of a multi-coat system, in which case the stylus can penetrate either to the substrate or to an inter mediate coat.

    This test has been found to be useful in comparing the scratch resistance of different coatings. It is most useful in providing relative ratings for a series of coated panels exhibiting significant differences inscratch resistance. 

    Before 2011, there is only one standard which is used to evaluate paint scratch resistance,which against to evaluate scientifically to paints scratch resistance under different applications. After revise this standard on 2011, this test method is divided two parts: One is constant-loading, i.e the loading to panels is constant during the scratch test, and the test results is shown as max. weights which don’t damage coatings. The other is variable loading, i.e. the loading on which stylus loads test panel is increased continuously from 0 during the whole test, then measure the distance from finial point to the other point when the paint begin to appear scratch. Testing result is shown as critical loads.  

    As a important member of Chinese Paint & Coating Standard Committee , Nitop is responsible for drafting the relative Chinese standards on the base of ISO1518, and developed NT 520 scratch testers which conforms the newest  ISO1518:2011.

 

Characters

◆ Big workingtable can be moved left and right—convenient for measuring different areas in the same panel

◆ Special fixing device forsample---can test different size substrate

◆ Sound-light Alarm system for puncturing through sample panel---more visual

◆ High hardness material stylus--moredurable

 

Main Technical Parameters： 

 

Ordering information → Technical Parameter ↓	NT 520/1	NT 520/2
Conform standards	ISO 1518-1 BS 3900：E2	ISO 1518-2
Stylus	1.Having a hemispherical hard-metal tip of radius 0.25mm or 0.5mm 2.Having a hemispherical synthetic-ruby of radius 0.25mm or 0.5mm	Coned sapphire or diamond, the tip radius is 0.03mm
Angle between stylus and sample	90°	90°
Weight	Constant-loading （0.5N×1pc，1N×1pc，2N×2pcs，5N×1pc，10N×1pc）	Variable-loading （0g～50g or 0g～100g or 0g～200g）
Motor	60W  220V  50HZ
Sytlus Moving Speed	（35±5）mm/s	（10±2） mm/s
Working Distance	120mm	100mm
Max. Panel Size	200mm×100mm
Max. Panle Thickness	Less than 1mm	Less than 12mm
Overall Size	500×260×380mm	500×260×340mm
Net Weight	17 KG	17.5KG