3-3.1. Thermo Plastic Liner Custom Fitting Instructions.
If the helmet does not fit properly, i.e. it has hot spots or pressure points or fit is too tight or too loose,
remove helmet and custom-fit TPL following TPL custom fitting instructions.
Tools and Equipment Required
1. Convection oven, capable of stabilized sustained temperature 200 degrees F 5 degrees F (93.3 degrees C ± 2.8
degrees C) with a thermometer and an internal volume of approximately 1.5 cubic feet or equivalent.
Timer or equivalent
Set oven rack to lowest position; preheat-
-Ensure oven stabilizes at approxi-
oven to 200 degrees F ± 5 degrees F
mately 200 degrees F.
(93.3 degrees C ± 2.8 degrees F).
Place TPL in preheated oven, fabric side
-Do not remove TPL cover; heat as
-Place TPL in center of rack for
Ensure that upper burner elements
-Caution applies only to non-
do not activate during TPL heating
process, or TPL plastic layers may
Allow oven to stabilize at temperature in
-In helmet, cover hook fasteners (if
step 1 before starting timed sequence.
installed) on rear of energy-
absorbing liner with masking tape
to ease TPL positioning when
placing into helmet for custom