Felt GSM:750-1700g/m2 Felt GSM Tolerance: 4% Air Permeability:25 -120cfm Tensile Strength: more 3000N/5cm It process high quality properties such as high-press resistance, good flexibility, good permeability, good size stability, less elongation, excellent tensile strength and can eliminate vacuum marks, blind hole mark, groove mark etc. Applying to many kinds of press such as: groove press, ...