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ultraviolet radiation, moisture and heat. A QUV test chamber uses fluorescent
lamps to provide a radiation spectrum centered in the ultraviolet wavelengths.
Moisture is provided by forced condensation, and temperature is controlled by
heaters.
Rockwell Hardness: The Rockwell Hardness test is a hardness measurement
based on the net increase in depth of impression as a load is applied. Hardness
numbers have no units and are commonly given in the R, L, M, E and K scales. The
higher the number in each of the scales, the harder the material.
Ash Content ASTM D5630, D2584, ISO 3451
An Ash test is used to determine if a material is filled. The test will identify the total
filler content. However to identify individual percentages in multi-filled materials
TGA (Thermo gravimetric Analysis) is applied.
Brookfield Viscosity (Relative Viscosity of Polyamides) ASTM D789, D4878
Viscosity is the property of resistance to flow exhibited within the body of a material
at a given shear rate. Flow behavior is an indirect measure of product consistency
and quality where materials must be consistent from batch to batch. This is a
sensitive method for material characterization because flow behavior is responsive
to molecular weight and molecular weight distribution. Equipment Used : Brookfield
Viscometer
Bulk Density ASTM D1895B
It is defined as the weight per unit volume of material, primarily used for
powders/pellets. The test provides a gross measure of particle size and dispersion
which can affect material flow consistency and reflect packaging quantity.
Compression Test
Compressive properties describe the behavior of a material when it is subjected to a
compressive load. Loading is at a relatively low and uniform rate. Compressive
strength and modulus are the two most common values produced.
Dielectric Constant/Dissipation Factor
Dielectric Constant is used to determine the ability of an insulator to store electrical
energy.It measures the inefficiency of an insulating material. If a material were to be
used for strictly insulating purposes, it would be better to have a lower dielectric
constant. When a material is to be used in electric applications where high
capacitance is needed, a higher dielectric constant is required. The test can be
conducted at different frequencies, often between the 10Hz and 2MHz range - the
specific frequency is determined by the customer.
Dielectric Strength
Dielectric strength is defined as the maximum voltage required to produce a
dielectric breakdown through the material and is expressed as Volts per unit
thickness. The higher the dielectric strength of a material the better its quality as an
insulator.
(Please note that this test description is intentionally generic in nature and aimed at
providing a descriptive summary to enhance test understanding)

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