Coating Materials
COATING MATERIALS
The type of coating required and the application method
differ depending on the environment in which the strain
gauge is used. In general, if one type of coating is not
sufficient, multiple coatings can be combined to protect the
strain gauges. At TML, the coating applied directly to the
surface of the strain gauge is referred to as the first coating
with subsequent coating layers referred to sequentially as
the second coating, third coating, etc. Multi-layer coatings
offer better strain gauge protection.
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Version | 03.2021
Single layer coating with one type
of coating materials
types of coating materials
Product Type / Materials Color Contents
Operating
temperature
Curing conditions
W-1
Microcrystalline wax
solid
Light yellow 500g 0~+50°C
Hot melting
+100~+120°C
Hardening in room
temperature
Purpose
Moisture- and water-proofing coating for laboratory and field requirements where mechanical protection is not needed, or used as the
first coating for multilayer coating.
Applications
The solid W-1 is put into a heating appratus (temperature-regulated oil bath is recommended) and completely melted at 100 to 120°C.
The hot melted W-1 is applied over the area to be coated with a brush. The W-1 cools down and turns into solid as soon as applied. It is
usually applied repeatedly till the cooled W-1 forms an adequate thickness.
N-1(s)
Chloroprene rubber
based solvent thinned
Light yellow 25g * -30~+80°C
Air-drying
A half day in room
temperature
Purpose
Moisture- and water-proofing coating for laboratory and less severe field requirements where mechanical protection is not needed.
Applications
A layer of N-1 is applied directly from the tube or with a brush over the area to be coated. Curing time is about half a day in room
temperature, but it depends on conditions such as the specimen material, temperature, and so on. If the coating layer is too thin,
apply another layer to make an adequate thickness.