"Truly adequate ventilation and
respiratory protection for working with two-part urethane foam is difficult
to achieve because the vapours are heavy and tend to pour onto the floor and
out of range of most exhaust systems. As well, the standard Organic Vapour
respirator filters do not offer protection against MDI, the most toxic
ingredient of urethane products. Only a respirator which supplies the
wearer with external fresh air can really be considered safe."
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