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The water resistance of sunscreen and day-care products.
Br J Dermatol. 1999 Feb; 140(2):259-63.BJ

Abstract

The water resistance of 10 sunscreen products and three day-care products containing ultraviolet filters has been assessed using an in vitro method based on transmission spectrometry. The sunscreen products which claimed to be 'water resistant' or 'waterproof' had significantly better substantivity than products which made no claim concerning water resistance. However, there was no significant difference between the substantivities of the 'water resistant' and 'waterproof' products, suggesting that it may be unnecessary to differentiate between these two categories on product labelling. Consumers would find choosing a sunscreen product more straightforward if sunscreens were simply labelled either 'water resistant' or 'not water resistant'. The day-care products were readily washed off, losing almost all photoprotection after one 20-min immersion. The water resistance of four products was measured using water temperatures of 20 degrees, 25 degrees and 30 degrees C. In three products water temperature had no effect on substantivity, although one product washed off more readily with increasing temperature.

Authors+Show Affiliations

Regional Medical Physics Department, Dryburn Hospital, Durham DH1 5TW, U.K.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

10233219

Citation

Stokes, R P., and B L. Diffey. "The Water Resistance of Sunscreen and Day-care Products." The British Journal of Dermatology, vol. 140, no. 2, 1999, pp. 259-63.
Stokes RP, Diffey BL. The water resistance of sunscreen and day-care products. Br J Dermatol. 1999;140(2):259-63.
Stokes, R. P., & Diffey, B. L. (1999). The water resistance of sunscreen and day-care products. The British Journal of Dermatology, 140(2), 259-63.
Stokes RP, Diffey BL. The Water Resistance of Sunscreen and Day-care Products. Br J Dermatol. 1999;140(2):259-63. PubMed PMID: 10233219.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The water resistance of sunscreen and day-care products. AU - Stokes,R P, AU - Diffey,B L, PY - 1999/5/8/pubmed PY - 2000/3/25/medline PY - 1999/5/8/entrez SP - 259 EP - 63 JF - The British journal of dermatology JO - Br J Dermatol VL - 140 IS - 2 N2 - The water resistance of 10 sunscreen products and three day-care products containing ultraviolet filters has been assessed using an in vitro method based on transmission spectrometry. The sunscreen products which claimed to be 'water resistant' or 'waterproof' had significantly better substantivity than products which made no claim concerning water resistance. However, there was no significant difference between the substantivities of the 'water resistant' and 'waterproof' products, suggesting that it may be unnecessary to differentiate between these two categories on product labelling. Consumers would find choosing a sunscreen product more straightforward if sunscreens were simply labelled either 'water resistant' or 'not water resistant'. The day-care products were readily washed off, losing almost all photoprotection after one 20-min immersion. The water resistance of four products was measured using water temperatures of 20 degrees, 25 degrees and 30 degrees C. In three products water temperature had no effect on substantivity, although one product washed off more readily with increasing temperature. SN - 0007-0963 UR - https://cancerres.unboundmedicine.com/medline/citation/10233219/The_water_resistance_of_sunscreen_and_day_care_products_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0007-0963&date=1999&volume=140&issue=2&spage=259 DB - PRIME DP - Unbound Medicine ER -