Polyethylene
What it is
Polyethylene (PE, CAS 9002-88-4) is a synthetic thermoplastic made by polymerizing ethylene gas — the same base plastic used in shopping bags and milk jugs. In wipe manufacturing, it can appear as part of the nonwoven fabric itself: most often as the outer "sheath" of a two-part (bicomponent) fiber paired with polypropylene or polyester for softness, or as a binder resin holding the fibrous web together, rather than as the wipe's dominant fiber — most wet-wipe substrates are majority polyester (PET), polypropylene, or cellulose/rayon. The same polymer, under the same CAS number, is also used far more broadly across cosmetics and personal care as an abrasive, emulsion stabilizer, film-former, and viscosity-increasing agent, which is the context most existing toxicological safety literature actually addresses.
Why it's flagged
The documented concern here is environmental persistence, not a skin-contact hazard: polyethylene does not biodegrade, and nonwoven wipe substrates — including PE-containing bicomponent and binder fibers — have been directly measured shedding plastic microfibers into wash water and, when wipes are improperly flushed, into sewage systems and marine sediment. A 2022 laboratory shedding study of commercial wipe and meltblown nonwovens found cellulose, polyester (PET), and polypropylene as the major polymers recovered from water- and air-shedding tests (Kwon et al., Environmental Science and Pollution Research), and a 2020 Irish coastal study attributed the large majority of white microplastic fibers at a wastewater-adjacent sampling site to wet wipes and sanitary products, predominantly PET (Ó Briain et al., Water Research). Regulators have begun treating single-use wipes as a distinct pollution category: the EU's 2023 REACH restriction on synthetic polymer microparticles and England's 2025 regulation banning plastic-containing wet wipes (enforcement from 2027) both target the synthetic-fiber content of nonwovens like wipes specifically because of fiber shedding and sewer blockage — not because of any toxicological finding about skin contact.
How concerned to be
On direct toxicity to skin, the evidence is reassuring rather than alarming: the Cosmetic Ingredient Review panel's 2007 safety assessment of polyethylene as used in cosmetics found no meaningful sensitization or systemic-absorption signal for the polymer, flagging only a data gap around trace polymerization residues that the panel judged unlikely to matter at the concentrations used. This is not an ingredient with a documented mechanism for harming the person using the wipe. It's worth being precise about scope, though: the peer-reviewed research on wipe-substrate microfiber shedding names PET and polypropylene far more often than plain polyethylene specifically, so the wipe-fiber literature trail for PE itself is thinner than for those two plastics — even though PE is a real, documented component of some nonwoven manufacturing (bicomponent-fiber sheaths, binder resins). The honest verdict: this is a genuine, increasingly regulated environmental flag (not a manufactured one — England's wipes-specific ban takes effect in 2027), so it's worth weighing if plastic pollution or "flushability" matters to you, but there's no basis in the current evidence for treating polyethylene as a skin-safety risk.
What it's called on a label
Look for any of these on an ingredient list: PE, Polyethene, Polythene, High-Density Polyethylene (HDPE), Low-Density Polyethylene (LDPE), Polyethylene wax, Polyethylene.
Sources
- Final Report on the Safety Assessment of Polyethylene, Cosmetic Ingredient Review, published in International Journal of Toxicology, 26(Suppl. 1):115-127 (2007)
- Commission Regulation (EU) 2023/2055 of 25 September 2023 amending Annex XVII to REACH (EC) No 1907/2006 as regards synthetic polymer microparticles, European Commission / Official Journal of the European Union (2023)
- The Environmental Protection (Wet Wipes Containing Plastic) (England) Regulations 2025, UK Government (legislation.gov.uk) (2025)
- Microfiber shedding from nonwoven materials including wipes and meltblown nonwovens in air and water environments, Environmental Science and Pollution Research (2022)
- The role of wet wipes and sanitary towels as a source of white microplastic fibres in the marine environment, Water Research, vol. 182, 116021 (2020)
- Polyethylene, EWG Skin Deep Cosmetics Database (2025)