At 24"Hg, or approximately 80% vacuum, the estimated theoretical lifting force is 2.5 kg / 5.7 lb before applying an engineering safety factor.

The 20mm diameter equals 0.787 inches, giving an area of approximately 0.49 square inches. At 80% vacuum, the effective pressure is 14.7 PSI x 0.8 = 11.76 PSI. Therefore, 0.49 - 11.76 = 5.7 lb.

The cup diameter is converted into suction area in square centimeters. For this cup, the area is approximately 3.1 cm². At 80% vacuum, the theoretical lifting force is 3.1 x 0.8 = 2.5 kg.

This style of suction cup is best suited to non-porous or lightly textured materials. Porous materials may require a higher-flow vacuum source, a different suction cup style, or application testing to confirm reliable holding force. Foam grippers are typically used for larger surface contact and variable product sizes, not simply because a material is porous.

Yes. The calculated force is theoretical. Use an appropriate safety factor based on the load orientation, acceleration, surface condition, vacuum level, leakage and risk of injury or product damage.