ISO 24450 is officially titled:
“Cosmetics — Sun protection test methods — In vitro water resistance test method for sunscreen products”
This international standard provides a laboratory-based (in vitro) method to assess the water resistance performance of sunscreen products. Unlike in vivo tests (which involve human subjects), ISO 24450 relies on reproducible lab tests to determine whether a sunscreen maintains its Sun Protection Factor (SPF) after exposure to water.
Key elements of the standard include:
Sunscreen labeled “water-resistant” must prove that it retains its SPF after being exposed to water. Misleading claims can:
ISO 24450 provides a scientifically validated and internationally recognized method to support water resistance claims without requiring extensive in vivo testing, making it a cost-effective, ethical, and scalable solution.
Using ISO 24450 brings substantial technical and regulatory benefits for sunscreen and skincare manufacturers:
Evaluate water resistance performance without human trials.
Demonstrates how long sunscreen protection lasts during swimming or sweating.
Eliminates the need for volunteer-based testing while maintaining accuracy.
Generates standardized data suitable for global regulatory agencies and product registrations.
Back your “water-resistant” claim with ISO-validated test Result
Implementing ISO 24450 gives your sun care brand a significant competitive and regulatory edge:
Show consumers and retailers that your products meet global performance standards.
Submit standardized testing data for quick review by regulators and certifiers.
Save time and money compared to traditional in vivo methods.
Prevent penalties, product bans, or lawsuits stemming from false “water-resistant” claims.
Stand out with ISO-backed performance attributes that are internationally recognized.
Meet import requirements and labeling laws in regions like the EU, USA, Asia-Pacific, and more.
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