Understanding Mineral and Chemical Sunscreens
Mineral and chemical sunscreens are distinguished by their UV-filtering ingredients: mineral sunscreens use zinc oxide and/or titanium dioxide, while chemical sunscreens use non-mineral UV filters (American Academy of Dermatology, sunscreen FAQs). A product combining mineral and chemical UV filters is a hybrid sunscreen and still contains chemical UV filters (American Academy of Dermatology).
The Australian Sunscreen Council supports clear ingredient descriptions that allow consumers to choose mineral sun protection and avoid chemical UV filters if they wish. The relevant question is which UV filters a sunscreen contains, not whether its ingredients are chemical substances in the broad scientific meaning of that expression.
Mineral sunscreen definition
A mineral sunscreen is a sunscreen whose UV-filtering active ingredients are exclusively zinc oxide, titanium dioxide, or a combination of the two, following the ingredient distinction described by the American Academy of Dermatology. The Academy also identifies “physical sunscreen” as a name for this mineral category (American Academy of Dermatology).
The two mineral UV filters are:
Zinc oxide, ZnO: A compound of zinc and oxygen in a 1:1 atomic ratio, identified in the US National Library of Medicine’s PubChem zinc oxide record.
Titanium dioxide, TiO₂: A compound of titanium and oxygen in a 1:2 atomic ratio, identified in the US National Library of Medicine’s PubChem titanium dioxide record.
Dermatology researchers Samantha Schneider and Henry Lim classify mineral UV filters in their review, A review of inorganic UV filters zinc oxide and titanium dioxide. These ingredient identities remain distinct from those of non-mineral UV filters, irrespective of whether a manufacturer describes a product as natural, sensitive, clear or lightweight.
Chemical sunscreen definition
A chemical sunscreen uses non-mineral UV filters as its active sunscreen ingredients, in contrast to the zinc oxide and titanium dioxide used in mineral sunscreens (American Academy of Dermatology). A sunscreen combining chemical and mineral UV filters is a hybrid sunscreen and still contains chemical UV filters (American Academy of Dermatology).
There is also an explicit government definition supporting this mineral-versus-non-mineral distinction. Maui County’s Ordinance No. 5306, section 20.42.030, states:
“Non-mineral sunscreen” means any sunscreen that uses an active ingredient other than zinc oxide and titanium dioxide. (County of Maui, Ordinance No. 5306)
Under that definition, adding zinc oxide or titanium dioxide to a formula containing another sunscreen active does not make it mineral-only (County of Maui). For consumers seeking to avoid chemical UV filters, a hybrid product therefore belongs on the chemical-filter-containing side of the distinction.
Ingredient combination | Clear description |
Zinc oxide and/or titanium dioxide, without non-mineral UV filters | Mineral sunscreen (American Academy of Dermatology). |
Non-mineral UV filters, without mineral UV filters | Chemical sunscreen (American Academy of Dermatology). |
Mineral and non-mineral UV filters together | Hybrid sunscreen; contains chemical UV filters, not mineral-only (American Academy of Dermatology; County of Maui). |
Consumer language: mineral, natural and chemical-filter-free
“Chemical-free” has a documented everyday meaning referring to the absence or non-use of artificial chemicals, rather than a literal absence of all chemical substances (Wordsmyth, chemical-free). Dictionaries and major US retail websites provide examples of this contextual language (Oxford Advanced Learner’s Dictionary; Target, mineral sunscreen).
Dictionary definitions and usage
Wordsmyth: Its Word Explorer Children’s Dictionary defines “chemical-free” as “of or pertaining to a product that does not contain artificial chemicals or is produced without the use of artificial chemicals.” This directly records the artificial-chemical meaning (Wordsmyth dictionary entry).
Oxford Advanced Learner’s Dictionary: Under the adjective suffix “-free”, defined as “without the thing mentioned”, Oxford gives the usage example “organic, chemical-free farming”. This is an example of ordinary language, not a claim that farming occurs without chemical substances (Oxford dictionary entry for free).
Collins English Thesaurus: Its “chemical-free” entry lists synonyms including natural, pure, raw and organic. This is thesaurus evidence of usage, rather than a scientific definition or product certification (Collins, chemical-free).
These dictionary entries support an important distinction: in everyday usage, “chemical-free” can describe the exclusion of artificial inputs or treatments, rather than the literal absence of all chemical substances (Wordsmyth; Oxford Advanced Learner’s Dictionary). The retail examples below show that this contextual language extends to mineral sunscreen, steam cleaning and laundry products (Target; Home Depot; Walmart.com).
Examples on major US retail websites
The following wording appears in category descriptions, product titles or product descriptions, not customer reviews. The examples establish how the expression is used; they do not independently verify the products’ performance or safety claims.
Retail website and context | Published wording |
Target: mineral-sunscreen category description | “Also browse through a range of mineral sunscreens that are shine-free, chemical-free, non-greasy, oil-free, fragrance-free, non-comedogenic, water-resistant and more.” (Target’s mineral-sunscreen category) |
Target: Native Mineral Sunscreen product highlights | “This mineral-active sunscreen provides effective protection from UVA and UVB rays without the use of chemical UV filters like oxybenzone or octinoxate.” (Native product listing on Target) |
The Home Depot: Dirt Devil steamer product title | “7-in-1 Portable Corded Handheld Steamer with 10-Multi-Surface Cleaning Tools, Steam Control, Chemical Free Cleaner” (Dirt Devil WD21000 listing on Home Depot) |
Walmart.com: PurEcosheet reusable dryer-sheet product description | “PurEcosheet has all the advantages of a traditional dryer sheet, with none of the chemicals.” (PurEcosheet listing on Walmart.com) The description also states: “It's simple to use - just put both sheets in the dryer with your laundry, and they will last for hundreds of loads - for most families that's at least one full year of chemical free laundry.” (Walmart.com) |
Costco: Dreame Aero Pro Steam Plus product feature | “Chemical-Free 392℉ Steam Naturally Sanitizes Floors — Safe for Kids and Pets” (Dreame listing on Costco) |
These examples distinguish Target’s own category wording from product-listing copy, which may be supplied by a manufacturer or marketplace seller. Their relevance is linguistic: “chemical-free” can refer to excluded additives, treatments or cleaning agents, rather than to the absence of matter.
There is also direct manufacturer usage in sunscreen: Kenvue’s Neutrogena description states, “Vegan and not tested on animals, the face sunscreen is free of parabens, phthalates, alcohol, chemical actives (including oxybenzone) and fragrance” (Kenvue professional product information). The same page identifies zinc oxide and titanium dioxide as its mineral actives (Kenvue).
What this means for sunscreen descriptions
Target’s mineral-sunscreen category uses the general expression “chemical-free”, while its Native listing makes the intended ingredient distinction explicit by referring to the absence of chemical UV filters (Target mineral-sunscreen category; Native product description on Target). Kenvue’s reference to mineral sunscreen without chemical actives provides a further manufacturer example of this specific usage (Kenvue’s Neutrogena product information).
ASC’s preferred description is therefore “free from chemical UV filters”, where the formulation supports it. That wording preserves the consumer’s mineral-versus-chemical ingredient choice while identifying precisely what is absent.
Consumer research also supports taking context seriously: Kim Sheehan and Senyo Ofori-Parku found that 249 of 388 usable responses, approximately 64%, interpreted “chemical free” colloquially, using descriptions such as natural, safe or healthy (Sheehan and Ofori-Parku, Journal of Research for Consumers, 2016). They also found other interpretations, so the study does not establish one universal consumer meaning or validate an unspecified product claim (Sheehan and Ofori-Parku).
Historical advertising-regulator correspondence provides another contextual example: in a response about compost advertising reported by Frank Swain, the UK Advertising Standards Authority explained that it could consider a word’s colloquial meaning and understood the claim in terms of man-made chemicals (ASA response reproduced in The Guardian). That was a decision about the particular advertisement, not a sunscreen-specific permission.
ASC recommends the explicit descriptions “mineral UV filters”, “no chemical UV filters” or “zinc oxide is the only UV filter”, where supported by the complete formulation. Dictionary and retail usage explain the language; they do not provide blanket legal permission for every unqualified “chemical-free” claim.
Chemical UV filters and petrochemical manufacturing
Most conventional chemical UV filters have petrochemical origins: University of Birmingham researchers Michael Hymas and Vasilios Stavros describe the class as overwhelmingly derived from petrochemical sources in their 2026 review, Photophysics of Biological and Biomimetic Sunscreen Molecules. Maui County likewise describes non-mineral sunscreens as containing petrochemical UV filters in its official sunscreen guidance.
Petrochemical inputs can come from crude oil or natural gas; the American Geosciences Institute explains that oil-derived naphtha and gas-derived feedstocks are processed into building blocks including propylene (American Geosciences Institute, Non-Fuel Products of Oil and Gas). Johnson Matthey’s industrial-process documentation identifies propylene as a starting material for making 2-ethylhexanol, an input used in several chemical UV filters (Johnson Matthey, LP Oxo technology).
Examples of crude-oil-linked manufacturing inputs
The following examples identify documented manufacturing connections, rather than assuming petroleum origin merely because an ingredient has a complex name. They distinguish material incorporated into a UV filter from solvents used during manufacture.
Chemical UV filter | Documented manufacturing connection |
Octinoxate, also called ethylhexyl methoxycinnamate | Rioux and colleagues’ 2022 review specifically describes commercial octinoxate production as petrochemical-based and involving fossil-fuel reagents, while recognising that a bio-sourced route is possible (Rioux et al., Frontiers in Chemistry). |
Octocrylene | Cowden and colleagues describe its formation from diphenylcyanoacrylic acid and 2-ethylhexanol, connecting this synthesis to the propylene-based industrial pathway described above (Cowden et al., RSC Advances, 2023; Johnson Matthey). |
Octisalate, also called ethylhexyl salicylate | Spectrum Chemical’s manufacturing flowchart identifies 2-ethylhexanol and methyl 2-hydroxybenzoate as inputs, again providing a connection to the propylene-based pathway (Spectrum Chemical, Octisalate USP documentation; Johnson Matthey). |
Avobenzone, also called butyl methoxydibenzoylmethane | MakingCosmetics documents synthesis using toluene as the reaction solvent; Australia’s NHMRC identifies petroleum refining as a major source of toluene (MakingCosmetics, avobenzone specification sheet; NHMRC, toluene fact sheet). |
These are documented routes and inputs, not a batch-by-batch certification of crude-oil origin for every supplier. A manufacturing solvent is also not the same thing as an ingredient intentionally present in a finished sunscreen; ASC does not treat petrochemical origin alone as proof of harm.
Other non-mineral UV filters consumers may encounter include oxybenzone, homosalate, 4-methylbenzylidene camphor, bemotrizinol, bisoctrizole, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate and ensulizole, identified in the scientific literature on chemical UV filters (Marcon and colleagues, 2026). This is an ingredient-identification list, not a statement that each is currently permitted in every jurisdiction or that its precise feedstock has been verified here.
Misleading online claims can obscure mineral sunscreen choices
Some online explanations emphasise that all sunscreen ingredients are chemicals, including mineral ingredients (Skin Cancer Foundation, Sunscreen Safety: The Facts; TGA, Sunscreen ingredients). That broad chemistry statement is not the same as saying all sunscreens contain chemical UV filters: mineral-only sunscreens use zinc oxide and/or titanium dioxide instead (American Academy of Dermatology).
ASC considers this framing potentially misleading when it is used to blur the distinction between mineral and chemical UV filters or imply that their ingredient-specific safety profiles are interchangeable. It can come across as dismissing consumers’ reasons for choosing mineral actives such as zinc oxide, rather than helping them make an informed choice.
There are recognised reasons for that choice: the American Academy of Dermatology recommends mineral sunscreens for people with sensitive skin, and the TGA acknowledges that mineral sunscreens may be gentler on the skin (American Academy of Dermatology; TGA). ASC’s position is that ingredient-specific safety and tolerability should be explained on the evidence, not obscured by saying that everything is a chemical.
Clear information supports informed sunscreen choice
ASC recommends checking the complete ingredient information and asking the manufacturer whether any chemical UV filters are present, including in products promoted as mineral-based. A statement that zinc oxide is included does not, by itself, establish that chemical UV filters are absent.
Consumers can choose mineral sunscreen while continuing effective sun protection; the American Academy of Dermatology recommends broad-spectrum, water-resistant sunscreen with SPF 30 or higher, together with shade, protective clothing, a hat and sunglasses (American Academy of Dermatology). Always follow the product’s application and reapplication directions, and avoid prolonged high-risk sun exposure (Therapeutic Goods Administration, sun-protection guidance).
TGA statement on homosalate and oxybenzone
The TGA identifies potential concerns specific to homosalate and oxybenzone and proposes reducing their permitted quantities in sunscreens (TGA, Sunscreen ingredients). It describes the proposed restrictions as precautionary, based on high-dose, long-duration animal studies rather than human studies, and states:
“Homosalate and oxybenzone are active ingredients that can potentially be absorbed through the skin and may cause harmful effects if used in high concentrations, over large areas and over an extended amount of time.” (Therapeutic Goods Administration, Sunscreen ingredients) References
American Academy of Dermatology. (n.d.). Sunscreen FAQs. https://www.aad.org/media/stats-sunscreen
American Geosciences Institute. (2018). Non-fuel products of oil and gas. In Petroleum and the environment. https://profession.americangeosciences.org/collections/publications/petroleum-environment-2018/non-fuel-products-oil-gas/
Collins. (n.d.). Chemical-free. In Collins English thesaurus. Retrieved October 5, 2026, from https://www.collinsdictionary.com/dictionary/english-thesaurus/chemical-free
Costco Wholesale. (n.d.). Dreame Aero Pro Steam Plus wet/dry vacuum mop hard floor cleaner [Product listing]. Retrieved October 5, 2026, from https://www.costco.com/p/-/dreame-aero-pro-steam-plus-wet-dry-vacuum-mop-hard-floor-cleaner/4201011808
County of Maui. (n.d.). [Frequently asked question on non-mineral sunscreen]. Retrieved October 5, 2026, from https://www.mauicounty.gov/FAQ.aspx?QID=1196
County of Maui. (2021). Ordinance No. 5306 (Bill No. 135, 2021). https://www.mauicounty.gov/DocumentCenter/View/130826/Ord-5306
Cowden, A. M., Whittock, A. L., Holt, E. L., Stavros, V. G., & Wills, M. (2023). Synthesis and characterisation of novel composite sunscreens containing both avobenzone and octocrylene motifs. RSC Advances, 13(25), 17017–17027. https://doi.org/10.1039/d3ra02252h
Home Depot. (n.d.). Dirt Devil 7-in-1 portable corded handheld steamer with 10 multi-surface cleaning tools, steam control, chemical free cleaner (WD21000) [Product listing]. Retrieved October 5, 2026, from https://www.homedepot.com/p/Dirt-Devil-7-in-1-Portable-Corded-Handheld-Steamer-with-10-Multi-Surface-Cleaning-Tools-Steam-Control-Chemical-Free-Cleaner-WD21000/328461725
Hymas, M., & Stavros, V. G. (2026). Photophysics of biological and biomimetic sunscreen molecules. ChemPhotoChem, 10(5), Article e70176. https://doi.org/10.1002/cptc.70176
Johnson Matthey. (n.d.). Oxo alcohols process: LP Oxo technology. Retrieved October 5, 2026, from https://matthey.com/products-and-markets/chemicals/speciality-chemicals/oxo-alcohols-process
Kenvue. (n.d.). Neutrogena Purescreen+ Invisible Daily Defense Mineral Face Liquid with SPF [Product information]. Retrieved October 5, 2026, from https://kenvuepro.com/en-us/neutrogena/products/neutrogena-purescreen-invisible-daily-defense-mineral-face-liquid-with-spf
MakingCosmetics. (n.d.). Avobenzone [Specification sheet]. https://www.makingcosmetics.com/on/demandware.static/-/Sites-makingcosmetics-master/default/dw9f153456/fact-sheets/fact-sheet-avobenzone.pdf
Marcon, G. Z., Theisen, M. C., Castro, A. M., Radke, G. J., & Fumagalli, F. (2026). Advances in organic UV filters for sunscreens over the past decade. Photochemistry and Photobiology. Advance online publication. https://doi.org/10.1111/php.70099
National Center for Biotechnology Information. (n.d.-a). Titanium dioxide. PubChem. Retrieved October 5, 2026, from https://pubchem.ncbi.nlm.nih.gov/compound/Titanium-Dioxide
National Center for Biotechnology Information. (n.d.-b). Zinc oxide. PubChem. Retrieved October 5, 2026, from https://pubchem.ncbi.nlm.nih.gov/compound/Zinc-Oxide
National Health and Medical Research Council. (n.d.). Toluene (CASRN 108-88-3). In Australian drinking water guidelines. https://guidelines.nhmrc.gov.au/australian-drinking-water-guidelines/part-5/physical-chemical-characteristics/toluene-casrn-108-88-3
Oxford University Press. (n.d.). -free. In Oxford advanced learner's dictionary. Retrieved October 5, 2026, from https://www.oxfordlearnersdictionaries.com/us/definition/english/free_1
Rioux, B., Combes, J., Woolley, J. M., Rodrigues, N. D. N., Mention, M. M., Stavros, V. G., & Allais, F. (2022). From biomass-derived p-hydroxycinnamic acids to novel sustainable and non-toxic phenolics-based UV-filters: A multidisciplinary journey. Frontiers in Chemistry, 10, Article 886367. https://doi.org/10.3389/fchem.2022.886367
Schneider, S. L., & Lim, H. W. (2019). A review of inorganic UV filters zinc oxide and titanium dioxide. Photodermatology, Photoimmunology & Photomedicine, 35(6), 442–446. https://doi.org/10.1111/phpp.12439
Sheehan, K., & Ofori-Parku, S. S. (2016). Chemical (free) reactions: Exploring colloquial understanding of the term "chemical free" and subsequent consumer attitudes. Journal of Research for Consumers, (30). https://www.jrconsumers.com/Academic_Articles/issue_30/Issue30-AcademicArticle-Sheehan35-78.pdf
Skin Cancer Foundation. (n.d.). Sunscreen safety: The facts. https://www.skincancer.org/blog/sunscreen-safety/
Spectrum Chemical. (n.d.). Octisalate, USP [Product documentation]. https://www.spectrumchemical.com/media/sd/O1236_SD.pdf
Swain, F. (2008, August 6). Dodgy science in TV adverts. The Guardian. http://www.guardian.co.uk/science/blog/2008/aug/06/dodgyscienceintvadverts
Target. (n.d.-a). Mineral sunscreen [Category page]. Retrieved October 5, 2026, from https://www.target.com/c/mineral-sunscreen-sun-care-tanning/-/N-3boeo
Target. (n.d.-b). Native mineral sunscreen with zinc oxide, unscented, SPF 30, 7oz [Product listing]. Retrieved October 5, 2026, from https://www.target.com/p/native-mineral-sunscreen-with-zinc-oxide-unscented-spf-30-7oz/-/A-94777827
Therapeutic Goods Administration. (n.d.-a). Applying the Advertising Code rules: Prominently displayed or communicated information. https://www.tga.gov.au/resources/guidance/applying-advertising-code-rules-prominently-displayed-or-communicated-information
Therapeutic Goods Administration. (n.d.-b). Sunscreen ingredients. https://www.tga.gov.au/resources/explore-topic/sunscreens/sunscreen-ingredients
Walmart. (n.d.). PurEcosheet reusable dryer sheets [Product listing]. Retrieved October 5, 2026, from https://www.walmart.com/ip/Purecosheet-Reusable-Dryer-Sheets-Cost-Effective-500-Loads-Chemical-Free-Vegan-Dryer-Sheet-Safe-Infants-Allergy-Eczema-Sufferers-Hypoallergenic/246860719
Wordsmyth. (n.d.). Chemical-free. In Word explorer children's dictionary. Retrieved October 5, 2026, from https://kids.wordsmyth.net/we/?level=2&rid=57139
