Mar Scratch

Mar Scratch. DescriptionScratch TipsEvaluationTest MethodsIndividual weights of varying loads mount to the top of each arm finger to exert a standard force on the surface of the test material Each instrument includes a weight set of 2N 3N 4N 5N 6N 7N 10N 15N and 20N loads Optional weights sets are also available consisting of either 4N 8N 9N 12N or 8N 13N 18N weights In addition an optional weight of 25N or Precision Weight Kit to achieve 06N loads are available Although flat specimens up to 22mm thick are normally tested the &#39freefloating&#39 arms fingers enable you test slightly contoured specimens provided they are rigid or adequately supported A springloaded specimen holder is standard and can be mounted to the end or side of the moveable platform for greater flexibility To mount contoured specimens two specimen holddown clamps are provided An optional 5mm spacer set is available to raise the gantry to accommodate specimens that are greater than 22mm thick Each MultiFinger Scratch / Mar Tester includes a set of five 10mm diameter hemisphere Scratch Tips and 70mm diameter hemisphere Mar Tips Both include a precision tungsten carbide ball mounted to the contact end Optional conical scratch tips are also available in either tungsten carbide (01mm 025mm 04mm and 05mm diameter) or diamond (with 90° 3mil or 90° 35mil radius point) Depending on the type of material under evaluation the visual appearance of a scratch normally involves changes in surface topography color or brightness Three methods are normally used Visual Evaluation For this technique the observer uses a controlled light source to visually inspect each scratch line and rates according to a Rating Scale 1 to 5 (1 = no scratch line at all 5 = severe scratch line) For plastic materials indicate if the line exhibits signs of whitening Width/Depth Using an optical measuring device such as an Optical Micrometer the operator measures the width and / or depth of the scratch Image Analysis Another option would be to use an Image Analysis technique such as SEM Detailed descriptions are recommended when depicting scratch or mar damage Items that might be described include surface topography material deformation material removal and color changes The following examples have been used to describe damage in plastics 1 scratch is shall The following link provides a listing of test methodsthe Taber MultiFinger Scratch / Mar Tester satisfies Please note additional accessories may be required.

A Scratch & Mar Resistance Agent is used to reinforce the coating’s resistance to these damages These agents are present in various coatings such as solventborne waterborne UV Powder where a specific need in the scratch and mar resistance is required for instance in Automotive Architectural or Ink fields.

Plastics Scratch and Mar Resistance Advances

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Scratch vs Mar What's the difference? WikiDiff

Scratch is a related term of mar As nouns the difference between scratch and mar is that scratch is (lb) a disruption mark or shallow cut on a surface made by scratching while mar is sea As a verb scratch is to rub a surface with a sharp object especially by a living creature to remove itching with nails claws etc As an adjective scratch.

Taber MultiFinger Scratch / Mar Tester (Scratch & Mar

Scratch / Mar Scratch and mar are types of mechanical surface damage that can occur during normal usage and handling shipping or assembly procedures Defined as “the resistance of a solid body to penetration by an edge or protuberance on a second body that is moving along its surface” [1] scratches are usually associated with a single occurrence in the specimen surface.