Hoffman Tear Hardness Tester

The Hoffman Tear Hardness Tester was developed for the comparative evaluation of the tear resistance and adhesion of many types of coatings.

Characteristics:
This instrument consists of a four-wheeled cart, a 0-20 graduated scale arm that is permanently attached to the cart in a counterbalanced condition about the pivot axis, and a scraping tool with a sharp circular edge mounted at 45° from the flat. test surface.

• Small size for field or plant testing.
• Flexible design: can apply more than 2400 grams of force.
• Easy to use and operate.

To operate, place the riders on the scale arm in the numbered positions. The carriage is held firmly by hand and moved in the opposite direction to cause a scratch. The large standard cyclist loads 100g per split, while the small cyclist loads 25g per split. This small rider can be used to make low-range measurements involving small increments of pressure, or it can serve as a vernier with the large rider to make more accurate mid-range measurements.

Tear hardness
The force necessary to cut the film to the substrate.

Accession
The force required to scratch a path through the film, when the stylus begins to move on an uncoated portion of the panel.

What includes:
◦Standard large ruler
◦Small ruler
◦Extra tool for scratch test
◦Case
◦Operation manual
◦Accessories and spare parts available, contact us for more information .