At Seiban, we undertake quality testing for durability, safety and comfort so that children can easily carry their randsel backpack everyday for 6 years.
Only randsel backpacks that clear our own strict quality standards are delivered to our customers.
For this test the randsel backpack is fixed horizontally and a swivel is pulled in a 45° diagonal direction, in order to measure the maximum load it can bear until the swivel detaches.
It demonstrates that the safety swivel automatically detaches with a load of 120 N (approximately 12 kg). *The observation results are not necessarily guaranteed to be identical even if undertaken with the same conditions and measurements.
This test examines whether the harmful substances (8 heavy metal elements) contained in the metallic parts of the randsel backpack do not exceed the standard value.
Confirming that the amount of heavy metals harmful to the human body do not exceed the standard value.
This is a degradation acceleration test that replicates 6 years worth of deterioration in 6 weeks, in order to assess the damage to the randsel backpack over time.
Cracks or damage to the randsel backpack cannot be found.
This is a test that measures the maximum load until deformation can be identified, after applying pressure to the randsel backpack from the front side directed towards the back side.
It demonstrates that it can withstand a maximum load of approximately 106 kg.
*The observation results are not necessarily guaranteed to be identical even if undertaken with the same conditions and measurements.
This test measures the strength of light reflected back when illuminating the reflective material that is used in the randsel backpacks.
It clears the required value for reflective brightness for retroreflective materials.
This test checks durability by forcibly degrading the resin parts (Sekan/back connector), then repeatedly adding a weight of 20 kg to it 10,000 times.
Cracks or damage to the resin parts (Sekan/back connector) cannot be found.