Warnings about fire and explosion risks from rotational moulders

A recent release from WorkSafe Victoria warns workers operating rotational moulders of the risk of exposure to fire and explosion from polyethylene powder, which could kill or seriously injure people if the polyethylene powder, located on surfaces, ignites.

The document states that moulds not tightly clamped together can leak powder when rotated, creating fuel for fire. The air gap can also let sparks access the interior of the mould, creating a high risk of explosion. Explosions have occurred inside moulds that were filled with polyethylene powder and placed in gas-fired ovens.

WorkSafe recommends putting in place risk control measures to eliminate or minimise risks by:

• ensuring moulds are tightly clamped and a breather tube is fitted with a filter;
• conducting a pre-rotational inspection to check each assembled mould does not leak;
• checking for dust and cleaning oven and moulding surfaces;
• regularly inspecting and testing the safety system and servicing the moulder;
• using an appropriate breather (pressure relief) tube fitted with a non-combustible porous filter (eg, fibreglass). Steel wool creates a fire/explosion risk and should not be used;
• placing signs on or near the machine to alert employees of the dangers of operating the machine;
• providing workers with instructions and training on safe work procedures and regularly reviewing them; and
• providing workers with PPE such as gloves, safety glasses and hearing protection.