WILLIAMS FIRE & HAZARD CONTROL PKW (Purple-K) dry chemical is a potassium bicarbonate-based fire suppressing agent, produced by a proprietary process and very effective against most Class B fires. PKW dry chemical is a free-flowing, water repellent, non-abrasive agent specifically formulated to create a highly-visible, dark violet discharge stream. This visibility assists the firefighter in precisely directing the PKW dry chemical stream (or dual foam/dry chemical stream) for efficient firefighting application.

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