Apply gradually increasing force to the chin strap until it loosens or breaks.
The chin strap should loosen or break between 150 N and 250 N.
If the chin strap loosens or breaks prematurely (below 150 N), it is considered unqualified due to insufficient strength; if it does not loosen or break after exceeding 250 N, there is a risk of strangulation, and it is also considered unqualified.
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