Holding force and load capacity
HOLDING FORCE:
At a theoretical vacuum of 100 % (0 bar abs. pressure), the holding force is 1 kg per square centimetre (cm²).
At a vacuum of 80 % (200 mbar abs. pressure or -800 mbar negative pressure), the holding force is 0.8 kg per square centimetre (cm²).
At a vacuum of 60 % (400 mbar abs. pressure or -600 mbar negative pressure), the holding force is 0.6 kg per square centimetre (cm²).
CARRYING CAPACITY at 60 % vacuum (-600 mbar):
For vacuum lifting systems, we calculate a load-bearing capacity of 0.3 kg per square centimetre (cm²) at a vacuum of 60 % and a 2-fold safety factor.
1 kg per cm² x 0.6 (60 %) / 2 (double safety)
For swivelling or turning devices, this value is halved again (0.15 kg per cm²).
CARRYING CAPACITY at 80 % vacuum (-800 mbar):
For vacuum systems with an oil-lubricated pump (max. vacuum 99.5 %), we calculate a load capacity of 0.4 kg per square centimetre (cm²) at a vacuum of 80 % and a 2-fold safety factor.
1 kg per cm² x 0.8 (80 %) / 2 (double safety)
For swivelling or turning devices, this value is halved again (0.2 kg per cm²).
CARRYING CAPACITY at 10 % vacuum (-100 mbar):
For vacuum lifting devices with vacuum blowers (max. vacuum 20-30 %), we calculate a load capacity of 0.05 kg per square centimetre (cm²) at a vacuum of 10 % and a 2-fold safety factor.
EN 13155 Loose lifting accessories - vacuum lifters:
For "Loose lifting accessories" vacuum lifting devices, a 2-fold safety at the end of the working range is prescribed in accordance with EN 13155. At a vacuum of 60 % (-0.6 bar), the maximum load capacity is therefore 0.3 kg per square centimetre (cm²) of suction surface.
