Is Wax Paper Compostable?

Whether wax paper is compostable depends on the type of wax used to coat it. The paper substrate itself is fully compostable, but the wax coating is the variable that determines whether the product can go into a home compost pile.

The Two Types of Wax Paper

Paraffin-waxed paper is coated with paraffin wax, a petroleum-derived product. Paraffin does not biodegrade at composting temperatures. Adding paraffin-waxed paper to a compost pile results in the paper substrate breaking down while the paraffin wax remains as a residue. Over time this accumulates in the pile and in finished compost as a non-biodegradable contaminant. Paraffin-waxed paper should not go into a home compost pile.

Vegetable or soy wax-coated paper is coated with plant-derived waxes. These waxes are biodegradable, though they break down more slowly than the paper substrate. In a hot, active compost pile they will eventually decompose fully. In a cold pile they may persist through one composting cycle and need a second before fully breaking down. Vegetable and soy wax paper is compostable in a home pile.

How to Tell Which Type You Have

The packaging of most wax paper products will state the type of coating. Products specifically marketed as compostable, eco-friendly, or plant-based are almost always coated with a vegetable or soy wax. Standard household wax paper rolls sold under conventional brand names are usually paraffin-coated.

If the packaging does not specify and you cannot determine the wax type, it is safer to exclude the product from your home compost pile and put it in general waste.

Waxed Cardboard

The same principle applies to waxed cardboard. Standard cardboard is excellent compost material. Cardboard with a glossy or slick wax coating (common on produce boxes, some food packaging, and fast food boxes) may be paraffin-coated and should be excluded unless the manufacturer confirms a plant-based coating. Corrugated cardboard without visible coating or gloss is safe to compost freely.