Spontaneous Combustion

Self-ignition of combustible material through chemical action (such as oxidation) of its constituents. Called also spontaneous ignition.

How does spontaneous combustion occur?

All fires, including those ignited spontaneously, require three elements. (Source: https://www.thespruce.com/preventing-home-and-workshop-fires-1398180)

Fuel
Oxygen
Heat source (no flame causing the heat)

Flammable finishes like linseed oil or tung oil combine with air and oxygen in a natural chemical reaction that creates heat. (Source: https://www.thespruce.com/preventing-home-and-workshop-fires-1398180)
The most common type is caused by improperly disposing of oil-based paints, stains, tea, linseed oils, varnishes, polyurethane, and paint thinners. (Source: https://www.essexct.gov/fire-marshal/bulletins/rise-in-fires-due-to-improper-disposal-of-oily-rags)

What are examples of spontaneous combustion? (Source. https://www.nps.gov/articles/fire-prevention-52-spontaneous-combustion.htm)

Rags and towels soaked with oils, including cooking oils.
Hot laundry left in piles.
Large piles of compost, mulch, manure, and leaf piles.
Moist baled hay, in the right conditions.

What oils are most likely to spontaneous combust? (Source: https://www.firehouse.com/rescue/article/10528863/the-phenomenon-of-spontaneous-combustion)

Linseed
Cottonseed
Castor
Fish
Lard
Olive
Peanut
Soybean

What are the ingredients in the Blackstone Griddle Seasoning & Cast Iron Conditioner?

Palm oil shortening
Beeswax
Palm oil
Canola oil
Soy oil

How do you properly dispose of rags/towels to reduce spontaneous combustion? (Source: https://www.thespruce.com/preventing-home-and-workshop-fires-1398180)

Hang oil-soaked rags/towels up to dry, preferably outdoors.
Isolate each rag/towel individually.
Don’t pile rags/towels on top of each other.
If rags/towels are hung up indoors, keep them away from heat sources, such as water heaters or furnaces.
Once rags are dry, throw them away in a trash receptacle that is outside and away from any structures.