Encyclopedia · styling polymer
VP/VA copolymer
A vinylpyrrolidone and vinyl acetate polymer used in sprays, mousses and gels for firmer, less humidity-sensitive hold than plain PVP.
What it is
VP/VA copolymer is a member of the vinylpyrrolidone polymer family, which a 1989 industry review lists among hair-care resins (Petter 1989). Compared with PVP, the vinyl acetate units make the film stiffer and less water-absorbing. That is the standard industry explanation rather than something we found tested.
How it works
It dries to a clear film on and between hairs. More vinyl acetate gives a harder, more water-resistant film. More vinylpyrrolidone gives a softer, more water-soluble one.
What the studies show
- No consumer trial of VP/VA hold or looks was found. The evidence is mechanism and manufacturer testing.
- A safety panel judged 27 of 30 vinylpyrrolidone polymers safe as used. We could not confirm VP/VA's own entry from the abstract, so treat the general result as the evidence (Johnson 2024).
- A rodent inhalation method for spray resins shows how hairspray resins are risk-assessed. It did not state that the resin tested was VP/VA (Carthew 2002).
- Rats given very high doses of hairspray aerosol developed lung inflammation (Kawajiri 2004).
How it's used in studies
The papers we reviewed give no concentrations.
Side effects and safety
The profile matches PVP: low skin risk, and aerosol sprays should not be used in confined spaces. Heavy daily use can build up on the hair.
Bottom line
A workhorse hold polymer. Look for it in "firm hold" sprays. It is cosmetic-only, and we are fairly confident about safety but not about performance, since no independent comparison with PVP or acrylates exists.
Studies 4
Petter PJ. Acetylene-derived polymers and their applications in hair and skin care. Int J Cosmet Sci. 1989
Tested: vinylpyrrolidone polymers and copolymers in hair care
Result: Industry review: PVP was the first synthetic hairspray resin; describes the vinylpyrrolidone copolymer classes (with vinyl acetate, DMAEMA and others) used in hair care.
Read the study ↗Johnson W Jr et al. Safety Assessment of Vinylpyrrolidone Polymers as Used in Cosmetics. Int J Toxicol. 2024
Tested: 30 vinylpyrrolidone polymers
Result: The expert panel judged 27 of 30 safe as used in cosmetics; the 3 exceptions (all urethanes) had insufficient data.
Read the study ↗Carthew P et al. Safety assessment for hair-spray resins: risk assessment based on rodent inhalation studies. Inhal Toxicol. 2002
Tested: inhaled hairspray resin
Result: Describes a no-effect-level plus modelled-exposure method; one resin was judged acceptable for consumer exposure under modelled use.
Read the study ↗Kawajiri T et al. Pathology and mechanism of lung toxicity following inhalation of hair spray in rats. Inhal Toxicol. 2004
Tested: hairspray aerosol at about 7 g/m3 for up to 12 weeks
Result: Neutrophilic lung inflammation, at an exposure far above normal consumer use.
Read the study ↗Related
- PVP (polyvinylpyrrolidone)A water-soluble film-forming polymer that gives temporary, washable hold in gels, mousses and sprays.
- Acrylates copolymerA family of acrylic polymers that thicken styling gels and dry to a hard, clear film for strong hold.
- Polyquaternium-11A positively charged vinylpyrrolidone copolymer used in mousses, gels and sprays for clear, flexible hold with some conditioning.
- Styling products explainedStyling products come down to how much hold and how much shine you want; there are almost no head-to-head trials, so this page combines formulation knowledge with the few things that have been measured.