Key Facts
• Western Japan experienced the earliest end to the rainy season on record.
• High temperatures increase the risk of spontaneous combustion in oil-soaked materials.
• NITE experiments showed oil-soaked towels igniting in dryers due to oxidation.
• Reaction speed doubles or triples with every 10°C temperature increase.
• Post-drying, stacked towels can accumulate heat and self-ignite.
• Oil residues may remain even after washing; handwashing and sun-drying are safer.
• Paint-soaked cloths emitted smoke after 60 hours and can self-ignite over days.
• Disposal of oil-soaked materials should involve soaking them in water first.
• Continued high temperatures are expected, increasing the risk of accidents.
Summary
Western Japan is facing record-breaking heat following the earliest end to the rainy season. This extreme heat heightens the risk of spontaneous combustion in oil-soaked materials, such as towels and cloths. Experiments by NITE revealed that oil-soaked towels placed in dryers can ignite due to oxidation, with reaction speeds accelerating as temperatures rise. Even after washing, oil residues may persist, making handwashing and sun-drying safer alternatives. Additionally, paint-soaked cloths can self-ignite over several days due to heat generated from air exposure. Proper disposal, such as soaking in water, is essential to prevent accidents. With high temperatures expected to continue, caution is advised to avoid unexpected fires.
