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Does Sunblock Strength Matter?

Does Sunblock Strength Matter? | Science Fair Projects | STEM Projects
Sunblock is important to protect us from the sun's harmful rays. But does the SPF number on the bottle really make a difference? Does the price of the sunblock affect how well it works? Let's find out!


The hypothesis is that the higher the SPF the better it will protect and that higher priced sun block will work better than lower priced.

Method & Materials

You will buy four types of sunblock with different SPFs, divide a report folder into four equal squares, apply the sunblock to the squares, take the report folder outside in the sun for five minutes, and then observe the results.
You will need four types of sunblock, a pack of developing paper, four clear plastic report folders, distilled water, a dish pan, and sodium thiosulfate.


The results showed that the sunblock which allowed the least amount of sun to penetrate, turned the whitest. The higher priced sunblock worked the best, and the thickness of the sunblock seemed to matter more than the SPF.

Why do this project?

This science project is interesting because it shows that the SPF number on the bottle may not be as important as we thought, and that the price and thickness of the sunblock may be more important.

Also Consider

Experiment variations to consider include testing different brands of sunblock with the same SPF, or testing different SPFs with the same brand of sunblock.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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