Page 11 - Combined_3_OCR

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HANDLING & STORAGE

Storage

Both the ”R” and ”T’’ components have > ) shelf life of 6 months or more when
drums are tightly sealed and stored at temperatures of 75°F. or lower. If
the drum is opened and only a portion of its contents removed, the remaining
material must be padded with nitrogen and carefully resealed to prevent con­
tamination by moisture or foreign materials. Components should be stored in
a sheltered area out of direct sunlight. If materials are stored for one
month or more, they should be agitated on a drum roller or similar equip­
ment for 30 minutes prior to use.

Handling

When opening drums of either component, first loosen the bung two turns
to allow the pressure to be relieved. After a drum has been vented, the
bung may be removed. Do not open drums of the ”R” component when the
material temperature is above 75°F. as this allows the blowing agent to
escape.

If raw materials for Pluragard 601 spray system are stored in an area
maintained below 70°F., a reserve of "R” and ”T" components (established
by applicator’s production rate) should be kept in a warming room at 70° - 75°F.
for a period long enough to insure even heating prior to use. Below 70°F.,
the increased viscosity of the components causes pump metering problems.
Above 80°F., vaporization of the blowing agent causes cavitation in the
pumps, irregular metering and (if the materials are not under pressure) an
excessive loss of blowing agent, resulting in high density foam or, in
extreme cases, no foam at all.

SAFETY PRECAUTIONS
Due to the irritating nature of the polymeric isocyanate or products con­
taining it (the ”T” component), precautions must be taken to protect
personnel from exposure to this material. The following recommendations will
minimize personnel exposure to the polymeric isocyanate.

1. Fresh air supply masks should be worn by all personnel in the
immediate spray area. Operators should not remove masks for
any reason at any time while inside the confined spray area.
Special precautions should be taken so that the air intake to the
compressor supplying the face mask does not take in the system’s
spray vapors or mist. The fresh air supply must be adequately
filtered so that it is free of atomized compressor lubricants.

2. It is recommended that all personnel within 50 ft. of the spray
area wear Bureau of Mines approved organic vapor respirators with
particulated prefilters.