A term used to indicate the protection factor of a garment.
With rainwear, it will always be equal to the ATPV.
Thermal Performance Value (ATPV):
The incident energy on a material that results in sufficient
heat transfer through the material to cause the onset
of a second-degree burn on human tissue.
Threshold (EBT) or Breakopen Threshold Above Stoll (EBTAS):
The energy needed to cause the material to breakopen.
The energy required to raise 1 gram of water one degree
Attenuation Factor (HAF):
The percent of energy blocked by the material.
Curve used to predict the onset of a second-degree burn
on human tissue.
The Employer shall not provide rainwear or clothing that
will further the extent of an injury. Example: Melting
and dripping rainwear can melt onto the worker’s
skin and cause a burn that would not have been there otherwise.
The melting burn furthered the extent of the injury.
Requirements shall be met initially as manufactured as
well as after five cleanings.
Material must withstand water pressure of 30 psig without
leaking. The seams of the rainwear must not exhibit any
evidence of leakage when exposed to 3 psig for (2) two
Material shall exhibit trapezoidal tear resistance of
6 lbs. In the warp and 6 lbs in the fill direction.
Material shall be flame retardant per ASTM D6413 with
maximum 2 second flame out and not more than 6”
Material shall be tested in accordance with ASTM F1959
with 8 kA arc current, 12” gap, 12” distance,
stainless steel electrodes to determine the following
Arc Rating – determine and report value; no minimum
value established for conformance.
· Heat Attenuation Factor – determine and
report value; no minimum value established for conformance
· EBT or EBTAS – determine and report value;
minimum value established at 5 cal/cm2.
· Melting/Dripping – material can show NO
evidence of melting or dripping at an exposure at least
equal to twice the Arc Rating.
· Material response characteristics shall be reported
for two typical exposures at least equal to the Arc Rating
and two typical exposures at least two times the Arc Rating.
Characteristics are: Afterflame time, breakopen, charring,
dripping, electric arc ignition, embrittlement, melting