For kindergarten use, the most important technical question is whether the field is soft enough to protect children, but stable enough for active movement.
Shock absorption
Your source framework places the shock absorption range at 40% to 55%, which is well above the ≥35% baseline in the compulsory national framework you referenced. This level of impact reduction helps cushion jumping and falling, and is especially relevant for protecting children’s knees and ankles during everyday play.
Vertical deformation
The surface is tuned to 5 mm to 8 mm, within the broader 3–10 mm requirement range in your source framework. This means the surface can provide cushioning without feeling unstable. Children can run, crawl, and play without the “sinking” sensation that can disrupt movement or balance.
Slip resistance
Your source gives a friction range of 0.60 to 0.80 in dry conditions and above 0.50 in wet conditions. That supports safe movement during running and turning, while also helping reduce the severity of sliding falls.
Fiber retention and softness
The source framework specifies:
- fiber pull-out force ≥30 N
- a controlled softness range appropriate for skin contact and abrasion reduction
These values matter in kindergarten settings because they help reduce the chance of fiber removal by children while keeping the yarn surface softer against skin during falls.
Durability
Your article gives:
- wear resistance: 6,500 cycles under ASTM D3884
- UV resistance: 6,000 hours
That indicates good resistance to heavy, repeated use in outdoor kindergarten play zones.
Environmental safety
The source framework also specifies:
- heavy metal migration ≤0.3 mg/kg
- TVOC ≤0.22 mg/(m³·h)
- formaldehyde, benzene, and toluene not detected
These are particularly important in early-childhood environments, where surface-contact safety and air quality are both highly sensitive issues.
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