Black plastic kitchen utensils, serving spoons, spatulas, tongs, and slotted spoons are ubiquitous. They are in most kitchens, most supermarkets, and most restaurant supply catalogues. They are also, according to a 2023 study published in Chemosphere, frequently manufactured from recycled electronic waste and contaminated with flame retardants at concentrations that can transfer to food during cooking.
The recycling problem
Black plastic is black because it is dyed with carbon black, which is used specifically to mask the colour of recycled plastic. Recycled plastic is a mix of materials, and a common input stream is electronic waste: televisions, computer casings, and electronic devices. Electronic plastics are manufactured with brominated flame retardants to meet fire safety standards. When these electronics are recycled and the plastic is re-used to make consumer products, the flame retardants come with them.
The 2023 Chemosphere study, led by Megan Liu at Toxic-Free Future, tested 203 black plastic products and found flame retardant chemicals including decabromodiphenyl ether (decaBDE, a banned PBDE) in 85% of items. Decabromodiphenyl ether is a persistent bioaccumulative toxin linked to thyroid disruption, neurodevelopmental harm, and cancer. It was banned in the EU and the US for use in new products, but recycling creates a route back into the consumer market that existing regulations do not adequately address.
What studies found
Critically, the study demonstrated migration, not merely presence. When black plastic cooking utensils were heated in oil to cooking temperatures, detectable levels of flame retardant chemicals transferred into the oil. The authors modelled dietary exposure scenarios and concluded that daily use of contaminated utensils could contribute meaningfully to dietary flame retardant intake. The finding was particularly concerning because kitchen utensils have no regulatory requirement for flame retardant testing, and the contamination route via recycled electronics is entirely legal under current frameworks.
“85% of black plastic kitchen items tested contained flame retardant chemicals, including compounds that have been banned from new manufacture. The recycling system is the vector.”
Worst offenders in the kitchen
The study found contamination in cooking utensils, takeaway food containers, sushi trays, and single-use packaging. Utensils are the highest concern because they are used in hot conditions with direct food contact and are used repeatedly over years. Takeaway containers are used briefly and typically at lower temperatures. The researchers also noted contamination in black plastic food prep items, strainers, and some children's toys made from similar recycled material streams.
What to do right now
Replace black plastic cooking utensils
Replace with stainless steel, bamboo, or wood. These materials have no equivalent contamination risk and are widely available at comparable prices. Stainless steel lasts indefinitely. Bamboo and wood are natural, biodegradable, and do not introduce chemical residues into food.
Do not heat black plastic
If you have black plastic items that you are not immediately replacing, avoid using them in hot conditions. Do not use black plastic spoons for stirring hot food on the stove. The migration of flame retardants into food increases with temperature.
Check black plastic children's items
The same recycling stream contaminates some children's toys and feeding products. While the Chemosphere study focused on kitchen items, the principle applies to any black plastic consumer product. Prefer natural materials for items children handle frequently or put in their mouths.