The pressure a waterproof membrane can withstand varies greatly depending on its type and application. Here's a summary of common standards:
Pressure Testing Standards
1000-2000 mmH₂O (10~20 kPa): Resistant to small water droplets or light rain
3000-4000 mmH₂O (30~40 kPa): Resistant to splashes, short-term waterproofing
5000-10000 mmH₂O (50~100 kPa): Resistant to prolonged underwater immersion
Common Waterproofing Ratings
3 ATM (approximately 30 meters deep): Resistant to splashes and sweat in daily life
5 ATM (approximately 50 meters deep): Resistant to swimming and showering
IP68: Completely dustproof, can withstand prolonged underwater immersion (depth specified by the manufacturer)
Key Points
Static vs. Dynamic: Laboratory tests are for static water pressure; actual usage (such as during exercise) may result in even lower dynamic pressure.
Irreversible damage: Exceeding the pressure resistance limit will cause permanent damage to the membrane pores, resulting in loss of waterproofing.