What does phthalate mean?
A phthalate is a chemical compound made from phthalic acid. The term includes both salts and esters, although in everyday references to plastics, health, and consumer products it often means phthalate esters used as plasticizers. These additives help make materials such as vinyl flexible, durable, and easier to process. Some phthalates have been restricted or phased out in particular applications because of possible health or environmental concerns, while others continue to be used under specific regulatory limits. The word is most common in chemistry, manufacturing, environmental science, and public-health discussions. A related term, phthalic acid, names the original acid rather than the derived salts and esters.
nounA chemical compound that is a salt or ester of phthalic acid, especially one used as a plasticizer in plastics. Many phthalates are used in products such as vinyl flooring, toys, and some cosmetics.
- A salt or ester derived from phthalic acid, particularly one used to soften or stabilize plastics.
"The manufacturer redesigned the tubing to reduce the amount of phthalate used in the plastic."
"Researchers tested the samples for phthalate compounds that could migrate from the packaging into food."
"The regulation limits the concentration of certain phthalates in children's products."
The plural is used when referring to multiple phthalate compounds or to the class of compounds generally.
"The laboratory detected several phthalates in the material."
The word phthalate hides a chemical clue: it comes from phthalic acid, a compound associated with benzene-based chemical chemistry.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does phthalate come from?
Phthalate is formed from phthalic, an adjective derived from phthalic acid, which in turn is named through the chemical combination of benzene with a carboxylic-acid group. The suffix -ate indicates a salt or ester of an acid. The word belongs to modern chemical terminology developed during the nineteenth century as organic chemistry expanded.
Related word forms
How phthalate is actually used
In chemistry and public-health contexts, the term is usually technical. When used in general discussion, it may refer broadly to phthalate compounds, especially those used as plasticizers; regulatory usage can distinguish among specific compounds.
Easily confused with phthalate
Phthalic acid is the parent acid, while phthalates are its salts or esters.