... /m2, 49 layers, meeting requirements for Protection Degree II8.0kg/m2, 61 layers, meeting requirements for Protection Degree III5.1kg/ ... m2, 45 layers, meeting requirements for Protection Degree II8.0kg/m2, 57 layers, meeting requirements for Protection Degree III5.1kg/ ... m2, 40 layers, meeting requirements for Protection Degree II8.0kg/m2, 50 layers, meeting requirements for Protection Degree III5.1kg/ ...