Hardness test rod

Surface marks are very unsightly, especially on a smooth, glossy surface, which can easily be damaged, such as the marks of nails on matte paint on a table surface or the marks of a staff on shiny objects. Those small reasons can cause great trouble.

Scratches can also be caused by metal objects, such as metal particles on coins, jewelry or rings on hands, any of which may damage the surface paint film.

The traditional test for surface resistance to damage is to attempt to mark the surface with nails by using#435The hardness tester can accurately measure the surface quality.

Design and operation mode

The scratch tool is disc-shaped, equipped with a locking device, and made of special plastic or metal. Installed on screws, pressure is obtained from a spiral spring, which provides an adjustable0-20NThe pressure between ranges. Place the instrument on the testing surface. In this way, it can lean against two guide wheels, lock the marking wheel in one position, and press the surface with a preset spring pressure. The spring strength can be divided into3Each range includes a replaceable spring in each section.

range1：0-3NSensitivity:0.1N

range2：0-10NSensitivity:0.5N

range3：0-20NSensitivity:1.0N

Operation method:

Firstly, select the testing wheel according to the testing requirements, such as plastic wheels for scratch resistance testing, copper wheels or other special wheels for metal scratches. After locking the screw, the marking wheel cannot rotate, and then a spring is set to provide the appropriate pressure required. Then place the instrument vertically on the testing surface and press down to make the guide wheel in contact with the surface. The instrument moves a certain distance (about a few centimeters) to make the wheel roll on the surface, causing a scratch during rapid movement. The test result is the spring force, measured in newtons. This force must produce a visible trace to the naked eye, but not a crack or scratch. If the purpose is the so-called metal marking effect, the result is expressed as the spring force when there is a black or gray mark on the surface.

be careful:

The marking wheel will wear out after use100After the second test, their positions must be changed. Move forward along the periphery2mmA scratch mark should be added to the previously used marking wheel.