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Wolff-Wilborn Pencil Hardness Tester

Standards ASTM D 3363, BS 3900-E19, ECCA ECCA T, ISO 15184

The purpose of scratch hardness tests is to determine the resistance of coating materials or lacquers to scratch effects on the surface. This test is of particular value for furniture or vehicle lacquers, but is also a useful aid in the development of synthetic resins or other film forming materials.

Generally, scratch hardness is measured by moving a sharp object under a known pressure over the test surface. The result may either be the value of the pressure required to scratch through the test material if a scratching tool of constant hardness is used, or the hardness of the scratching tool is varied while constant 750 g pressure is applied.

Twenty pencils from grade 9B to 9H are used with a standard holder
Pencils are moved over the surface under a fixed pressure and a fixed angle - ensuring the least amount of operator error
Pencils can be easily exchanged to minimize down time during the test

	Wolf-Wilburn Pencil Hardness Tester

Pencil tester Set of 20 pencils from 9B to 9H Carrying case	Pencil sharpener Abrasive 400 grit paper

Available Items -

Literature

Prices subject to change

Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only

Export orders require quotations - click here for a quote

For more info call us 1-800-762-2478 or 954-946-9454.

Item Number	Item	Prices
HA-5800	Wolf-Wilburn Pencil Hardness Tester	$411.00
HA-5801	Replacement pencil set (20)	51.00

Inspector's Dur-O-Test

Hardness Tester

This pocket instrument allows hardness tests on flat and curved surfaces. The instrument consists of a sleeve with a pressure spring that can be bent to various tensions by using a slide. The spring acts on a tungsten carbide needle (1.0 mm / 0.04 in.) with its tip extending out of the sleeve.

A locking screw fixes the slide, thus maintaining constant spring tension. Protect spring from fatigue, therefore, always set tension value at zero when not in use. Three pressure springs of varying strengths ranging from 0-20 N (0-2000g) are available to cover a large hardness range.

Protect spring from fatigue, therefore, always set tension value at zero when not in use.

Procedure

Test coating may not be elastic. Place the top of the Dur-O-Test on the test surface and draw a line approx. 10mm (0.4 in.) long over a period of 1 second, maintaining sufficient pressure to keep the needle against the rod stop. If the tension has been too high the surface will be clearly marked. If too low, there will be no mark. The correct tension will result in a barely visible mark. Three interchangeable springs of varying strengths correspond to the test ranges engraved on the barrel:

No. 1 of 0 — 300 gms, each div. = 10 gms
No. 2 of 0 — 1000 gms, each div. = 50 gms
No. 3 of 0 — 2000 gms, each div. = 100 gms

Technical Data
Length:	160 mm (6.3 in.)
Diameter:	16 mm (0.6 in.)
Weight:	0.3 gr (0.7 lb.)