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TÜV Tests.
- Tempering line (Hamon) is real.
- Hardness of the blade: 40 ° and 60 ° Rockwell.
- Straightness of the blade spine.
- Blade tongue is forged in 1 piece with the blade and going inside the handle entirely.
- Chemical tests of grip wrap, EN 71, PAK.
- Chemial tests of scabbard material EN 71, PAK, AZO.
- No sharp edges on all sword parts, except for blade edge.
- Grip wrap test for tightness, min 500 Newton, and against oil resistance.
- Tsuba test: 500 N must the tsuba withstand minimum to not bend or slip above the blade.
- Dynamic Test of the blade: 10000 bending tests and no material-fatigue.
- Cutting tests: No breaks, cracks or deformation of the blade.
- 500 x hitting test on bamboo. Blade must not bend or deform.
- 50 x diagonal cutting test with tatami omote.
- 1000 x fit test of blade and scabbard. After 1000 x drawing the sword, it must sit tight in the scabbard.
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