Nordson CoolWave 2 - Page 98

UV Glossary
9-7
Part 1089210A04
E 2010 Nordson Corporation
starter bulb Used in the start up of microwave systems to ignite the mercury vapor
in the bulb.
static exposure Exposure to a constant irradiance for a controlled period of time.
surface cure When the UV material is cured only on the surface exposed to the UV.
tape test for measuring
adhesion
When an X-cut or lattice pattern of 6 or 11 cuts are scratched through
the UV cured material to the substrate. Pressure-sensitive tape is
then applied over the cuts and removed. Pulling the tape away from
the substrate will reveal the degree of adhesion. If any material
between the lines is pulled off with the tape, the adhesion is poor. If
the material remains, the adhesion is good. The recommended
guidelines for testing and evaluation are documented in the ASTM
spec D3359-95a under Methods A and B. Method A employs the
X-cut and is used for coatings that are 5 mils or greater. Method B
calls for lattice cuts and is recommended for coatings with 0−5 mils of
thickness.
through cure When the UV material is cured down to and including the material /
substrate interface.
Threshold Limit Value
(TLV)
The maximum exposure a person should receive over an 8-hour shift
during a 40-hour week without producing an ill effect. Often reported
in (mg / m
3
) or ppm.
Time-Weighed Average
(TWA)
Refer to Threshold Limit Value (TLV).
total energy Refer to energy density.
transmittance The ratio of the radiant energy passed through a body to the total
radiant energy received by the body.
ultraviolet light Radiant energy in the wavelength band of 100 to 400 nanometers.
UVA (315−400 nanometers) The portion of the electromagnetic spectrum ranging between 315 and
400 nm. UVA represents the largest portion of UV energy and is
commonly referred to as long UV. UVA is most responsible for skin
aging and increased skin pigmentation. UVA is at the lower limit of
sensitivity to the human eye.
UVB (280−315 nanometers) The portion of the electromagnetic spectrum ranging between 280 and
315 nm. UVB is most responsible for reddening and burning of the
skin and damage to the eyes.
UVC
(200−280 nanometers)
The portion of the electromagnetic spectrum ranging between 200 and
280 nm. UVC is typically referred to as short UV.
UVV
(400−445 nanometers)
The portion of the electromagnetic spectrum ranging between 400 and
445 nm. The V stands for visible UV.