Impact Resistance is ….

Class	Force	Height	Impact energy	Test type
IK 11	10 kg	500mm	50 Joules	Drop
IK 10	5 kg	400mm	20 Joules	Pendulum or drop
IK 09	5 kg	200mm	10 Joules	Pendulum or drop
IK 08	1.7 kg	300mm	5 Joules	Pendulum or drop