Dynamic Strap Retention Machine 

Dynamic Strap Retention Machine purpose 
It's use helmet chin strap retention tesitng 

Dynamic Strap Retention Machine standard 
It's according to ECE R22.05 ,EN107 EN1078 etc Standard 


Dynamic Strap Retention Machine specifications 
1.Chin straps shall be made of suitable material not less than 12.7mm in width 
2.The residual elongation of the strap shall not exceed 25mm
3.The stirrup shal be attached to a pre-load assembly such that the total mass of the stirrup and pre-load assembly shall be 1.5kg±kg
4.The drop mass (impactor )shall also slid freely upon the pre-load assembly and shall have a mass of 10.00kg±0.05kg