25/11/2025
SPF has become a major topic of discussion this year after a report from consumer group Choice revealed that several sunscreens were not providing the level of protection stated on their labels.
This has led many people to question how SPF testing is performed and what the SPF rating actually means.
SPF (Sun Protection Factor) refers to how much protection a sunscreen provides from Ultraviolet B (UVB) rays—the rays most responsible for sunburn and increasing the risk of skin cancer.
The SPF number reflects how much UVB is prevented from reaching the skin (keeping in mind that no sunscreen blocks 100% of UV rays).
SPF 50 allows around 1/50th of UVB to reach the skin (about 2%), meaning it blocks roughly 98% of UVB radiation.
SPF 30 allows about 1/30th (3.3%), meaning it blocks around 96.7%.
It’s also important to understand that SPF testing occurs under controlled laboratory conditions. Sunscreen is applied generously to a small skin area, then exposed to simulated UV light, and results are compared with unprotected skin.
In real life, many people don’t apply enough sunscreen, miss certain areas, or don’t allow the product to absorb fully before going into the sun. Even the highest-rated sunscreen won’t work effectively unless applied correctly and reapplied every two hours, or after swimming or sweating.
If you’re unsure which sunscreen suits you or your family, speak with your local pharmacist for guidance on SPF ratings, water resistance, sports suitability, finish types, and whether a lotion, spray, or roll-on is best for your needs.
And remember—choosing an SPF 30 (ideally SPF 50+) sunscreen is only one part of sun protection.
Always slip on protective clothing, slop on sunscreen, slap on a wide-brimmed hat, seek shade and slide on sunglasses 😎
Taking the right precautions and not relying on sunscreen alone is the safest way to enjoy a beautiful Aussie summer while staying sun smart!
