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Sunscreen: what SPF actually buys
Sunscreen: what SPF actually buys: sPF turned into transmitted UV as a table, then the part every label hides: the test dose is 2 mg/cm², and the amount…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
SPF turned into transmitted UV as a table, then the part every label hides: the test dose is 2 mg/cm², and the amount people really apply gives a fraction of the labelled protection — computed here in millilitres for a face, an arm, a leg and a whole body, by body size.
Item pages cover the UVA-in-a-circle requirement and what it certifies, water resistance testing, the EU list of permitted filters, mineral against organic, reapplication intervals, babies under six months, SPF in make-up, sprays and missed patches, expiry and a hot car, UPF clothing, and altitude and snow. ~15 pages.
How to use it
Use Sunscreen: what SPF actually buys to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | kui palju päikesekreemi näole |
| Finnish | kuinka paljon aurinkovoidetta |
| Russian | сколько крема наносить на лицо |
| English | how much sunscreen for full body |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: Commission Recommendation 2006/647/EC (EUR-Lex, reusable), Regulation (EC) 1223/2009 Annex VI UV filter list via CosIng (open), ISO 24444 / 24443 / 18861 scope abstracts, published application-thickness studies (cited); dose arithmetic computed. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
/sun is UV index and safe exposure time, /skin is ingredients and skin conditions; this is choosing and applying the bottle.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Why it belongs on TempoLife
/sun, /skin, /uv-index-forecast-timeline.
Frequently asked questions
What does this guide cover?
SPF turned into transmitted UV as a table, then the part every label hides: the test dose is 2 mg/cm², and the amount people really apply gives a fraction of the labelled protection — computed here in millilitres for a face, an arm, a leg and a whole body, by body size. Item pages cover the UVA-in-a-circle requirement and what it certifies, water resistance testing, the EU list of permitted filters, mineral against organic, reapplication intervals, babies under six months, SPF in make-up, sprays and missed…
What evidence does it use?
Commission Recommendation 2006/647/EC (EUR-Lex, reusable), Regulation (EC) 1223/2009 Annex VI UV filter list via CosIng (open), ISO 24444 / 24443 / 18861 scope abstracts, published application-thickness studies (cited); dose arithmetic computed.
Where does this guide stop?
/sun is UV index and safe exposure time, /skin is ingredients and skin conditions; this is choosing and applying the bottle.
Turn the reference into a routine
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