DeFelsko PosiTest CH Manual De Instrucciones página 2

The PosiTest CH Cross Hatch Adhesion Tester determines a
coating's ability to resist separation from a substrate. The test is
performed by cutting a lattice pattern in the coating, applying a piece of
pressure-sensitive tape over the coating, and removing it swiftly to
determine how much coating is removed from the surface. The test
results are compared to the descriptions and pictures shown in
Classification of Adhesion Test Results (pg. 5 and 8). Select the
closest classification and record the results.
PosiTest CH Adhesion Test Kits can be used to test in accordance
with ISO 2409/16276-2, ASTM D3359, and other international
standards for cross hatch adhesion testing.
NOTE:
These instructions provide brief summaries of procedures
used to perform a Cross Hatch Adhesion Test. Consult and follow the
applicable Standard prior to testing.
Preparing the Test Sample:
This test is primarily performed on coated test panels, but may be
performed on other coated substrates if required.
For hard panels, the minimum thickness shall be 0.25 mm (0.01"). For
relatively soft panels such as wood, the minimum thickness shall be 10
mm (0.4").
The area under test should be free from blemishes and other surface
imperfections. The test area should be large enough to perform 3
separate tests, with at least 5 mm (0.2 in) of space between tests and
the edges of the panel.
Condition the panels immediately prior to testing at a temperature of 23
± 2 C and a relative humidity of (50 ± 5)% for a minimum of 16 hours
o
(Required for laboratory testing in accordance with ISO 2409).
To accurately determine the correct cutting blade, measure the
sample's dry film thickness using a coating thickness gage such as the
PosiTector 6
Introduction
Preparation
, PosiTector 2 , or PosiTest DFT.
1