![]() ![]() The Triax uses a head form that, when dropped on the surface, reports measurements of how well the safety surface absorbs the impact. ![]() What Is Critical Fall Height (CFH)?ĬFH is calculated by impact testing a safety surface with a device known as a Triax impact tester. Recently, ASTM International brought about some changes to this familiar playground surfacing standard, and everyone in the industry should know about these new requirements. It tests for the critical fall height (CFH) of a playground surface. An Explanation of the New ASTM F3351 Test Method for Specified Height and Why It’s ImportantĪSTM F1292 has been a safety standard since the early 90s.
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