Hardness / Scratch Resistance

Hardness / Scratch Resistance
The property of a substance that is resistant to repeated rubbing or scratching. In general, it meant the resistance of a (coating) layer or surface against mechanical friction....
Hardness / Scratch Resistance
The property of a substance that is resistant to repeated rubbing or scratching. In general, it meant the resistance of a (coating) layer or surface against mechanical friction. Abrasion of products is a concept that can't be handled in general. One must explicitly specify the conditions under which the product must be durable.

Any change in wear conditions, the assessment of the wear thoroughly change. In general we distinguish wear as single or repetitive. In the former case, a small contamination in the long run leads to serious damage. By repeating is meant the resistance of a surface under prolonged load. The lowering of the coefficient of friction can give a significant improvement. For the determination of the abrasion resistance it should be practical to approach conditions as much as possible.

Forms of wear or scratch resistance are e.g. brush abrasion testing, rotating abrasion testing, rub testing, sand fall testing and or shear tests.

Hardness
The determination of the reactive resistance, the hardness of a surface of which a coating or alternative protective layer is provided. As with abrasion and scratch resistance there should be an explicit reference given to the hardness meant. Under the hardness of the coatings is in general understood the impression value at which a deformation of the coating occurs. This is determined by pressing sharp or blunt stylus, depending on the material or coating, into the surface.

Another method to measure hardness is the determination of rolling resistance of a coated surface. The equipment required is using spheres that find resistance during the rolling movement on the test surface i.e. Pendulum hardness. The degree of hardness determines on the number of movements by a pendulum roller experiencing resistance during this process.

Other types of hardness tests are, Barcol Impression, Shore A-D, Sclerometer and Wolf-Wilburn pencil scratch resistance determination and Persoz or Konig pendulum hardness testers.
Standards News FAQ Links

BARCOL HARDNESS TESTER

Simple, portable instrument for testing the hardness of materials acc. to ASTM D2583. When pressure is applied to the device, a point penetrates the material and the degree of hardness is displayed on a dial, which is graduated fr...

BUCHHOLZ HARDNESS INDENTATION TEST

The TQC Buchholz Hardness Indentation Test provides a method for carrying out an indentation test on coatings complying with the ISO 2815-2003 standard. The TQC Buchholz Hardness Indentation Test consists of a calibrated slip-on wei...

CONCRETE INSPECTION HAMMER (MECHANICAL)

Instrument for testing the quality of concrete and other construction materials according to UNI EN 12504-2 and ASTM C805. The recoil-force of the automatic hammer is displayed on the scale and indicates the strength of the concrete...

DIGITAL USB MICROSCOPE WITH LCD SCREEN

Small, portable, inexpensive and easy microscope with LCD display that can be connected directly to a PC. Supplied with software for immediate inspection and measuring. The unique optical design combines the advantages of a USB-micr...

HARDNESS PEN

The TQC Hardness Pen is a pocket instrument for testing the hardness and wear/scratch resistance of materials such as coatings, lacquers, plastics or related products. A tungsten carbide tip is drawn over the surface with a defined ...

IMPACT TEST

The TQC Impact Test is used to determine the impact resistivity and flexibility of coatings. The dual scale instrument is equipped with a special guidance which assures that the distance between each impact is always according to th...

KNOCK-OUT TESTPANELS

Our new TQC Knock-out testpanels are designed to minimize the build-up of paint on the panel edges because of de knock-out frames. Also because of the 4 mm holes in the knock-out frames it is easy to hang the panels horizontally or ...

PENCIL HARDNESS TEST ACC. WOLFF WILBORN

The TQC Pencil Hardness Test according Wolff Wilborn provides in a simple method to test the scratch hardness of coatings. In this test, pencils in a range of 6B to 8H hardness-grade are used. The pencil is moved scratching over the...

PENCIL SHARPENER FOR PENCIL HARDNESS TEST PENCILS

Sharpener with special cut blade for use with the Pencil Hardness Test according Wolff Wilborn pencils. This pencil sharpener complies with ISO 15184 by leaving the cylindrical pencil head intact.

PENCILS FOR HARDNESS TEST ACCORDING WOLFF WILBORN

Koh-I-Noor 1500 set of 20 pencils in an aluminum case to use with the Wolff Wilborn Hardness Test. Pencils ranging from 8b to 10H (8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H) The ISO 15184 standard...

PENDULUM HARDNESS TESTER

The TQC Pendulum Hardness Tester has a lot of unique features that ease defining hardness by the König and/or Persoz method as described in ISO 1522. Both methods work on the principle that the damping time of a pendulum oscill...

POSITECTOR SHORE HARDNESS DUROMETER PROBE

PosiTector Shore Hardness Durometer SHD probe. Shore D for medium to extra hard materials such as hard rubber, epoxies, hard plastics, PVC, acrylic, etc.This probe comes with test block, protective rubber cap for probe, Certificate ...

SHORE HARDNESS GAUGE DIN 53505 ISO 868 ASTM D2240

The TQC Shore Hardness Gauge is a reliable instrument for measuring the impression hardness of soft materials such as coatings, plastics and rubber. Equipped with a drag indicator, which holds the highest measured result. Delivery i...

SHORE HARDNESS GAUGE TEST STAND

The TQC Shore Hardness Gauge Test Stand is suitable for Shore A, C, and D* type Durometer. The test stand construction includes operating handle, adjustable glass stage, (height) adjustable Durometer fixture. With this test stand ha...

SHORE HARDNESS TESTBLOCK KIT

The TQC Shore Hardness Testblock Kit with different values of hardness. As a reference check it will indicate if a durometer is operating within tolerances. The indivual test blocks are provided with serial numbers to guarentee inco...

TABER ABRASER

Taber Abrasion is used to determine relative resistance to abrasion defined as ‘the ability of a material to withstand mechanical damage’ such as rubbing, scraping or erosion. The Taber Abraser is an industry standard ...

TABER CROCKMETER

The Taber® Crockmeter 418 provides a quick and accurate method to determine the amount of color that is transferred by rubbing textile materials to other surfaces. The Taber Crockmeter was originally designed to simulate the act...

TABER FALLING SAND ABRASION

The Falling Sand Abrasion Tester is broadly used to measure the abrasion resistance of paint, lacquers and other organic coatings... Based on a design described in ASTM D 968 and other internationally recognized test standards, the...

TABER LINEAR ABRASER

The TABER® Linear Abraser is designed to test virtually any size or shape specimen, the Linear Abraser is ideal for material properties of contoured surfaces and finished products. Initially developed to evaluate wear resistan...

TABER MULTI-FINGER SCRATCH MAR TESTER

The TABER ® Multi-Finger Scratch / Mar Tester is used to measure the relative resistance or susceptibility of a material surface to scratching, marring, gouging, scraping, engraving and other similar physical damage that can&rsq...

TABER OSCILLATING ABRASION TESTER

The Taber® Oscillating Abrasion Tester – Model 6160 is also known as an “oscillating sand tester”. Described in ASTM F735, The Taber® Oscillating Abrasion Tester is used to measure the resistance of a mater...

TABER RECIPROCATING ABRASER

The Taber® Reciprocating Abraser is a test apparatus similar to the instrument described in test method ISO 1518. The Taber® Reciprocating Abraser is ideal for flat surfaces. With optional attachments the Taber® Reciproc...

TABER SHEAR SCRATCH TESTER

Motorised instrument for testing the resistance to scratching of materials. A sample plate rotates while a conical diamond point is pressed on the sample plate. The relation between the depth of the scratch and the applied (pre-set)...

USB measuring microscope - Model 2012

Small, portable, inexpensive and easy microscope that can be connected directly to a PC. Supplied with software for immediate inspection and measuring. The unique optical design combines the advantages of a USB-microscope digital ...

Wet Abrasion Scrub | Washability Test Tools

TQC provides a wide range of possible tools suitable for the TQC Washability / Scrub Test AB5000. Always use the tools as instructed by both manual and standard.   Size tools:Inner dimensions holder 92x41mmOuter dimensions ho...

Wet Abrasion Scrub | Washability Tester

TQC scrub / washability test now custom configurable TQC Abrasion scrub/ washability Test to perform an abrasion and washability  test on coated panels to define the resistance of paint, varnish or related products to scratchi...