ASTM developed standards which include a category intended to protect children five years of age and under. ASTM Standard F1346-91 for spa covers includes specific performance tests and labeling requirements. Covers must be able to pass certain tests.
The first is Static Load. “In the case of spas with a width or diameter greater than 8′ from the periphery, the cover shall be able to hold a weight of 485 pounds to permit a rescue operation. In the case of a spa with a width or diameter not greater than 8′ the cover shall withstand the weight of 275 pounds”.
Second is Perimeter Deflection. “The covers shall be designed in such a way that when tested, deflection of the cover does not allow the test object to pass between the cover and the side of the spa, or to gain access to the water”. Additionally, testing for surface drainage is conducted to see if a dangerous amount of rain could collect on the cover’s surface.
There are also requirements to include labeling in consumer information and on the cover itself. Labeling must contain proper warnings (as described by the Standard) and identify the product as a safety cover.