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Lifting force under different conditions / Max Lifting Force:
This table provides a rough estimation of the max perpendicular adhesion force and max parallel adhesion force on different materials. These values may vary depending on material and surface conditions.

Perpendicular Hold                                  Parallel Hold       P/P Ratio
Glass                            170kg (375lbs)     120kg (265lbs)    0.7
Metal                           110kg (242lbs       110kg (242lbs)    1.0
Plastic                         100kg (220lbs)     100kg (220lbs)   1.0
Wood                          100kg (220lbs)       65kg (143lbs)    0.65
Ceramic Tile              170kg (375lbs)      120kg (265lbs)   0.7
Rough Concrete         80kg (176lbs)        80kg (176lbs)    1.0
Plasterboard               75kg (165lbs)         65kg (143lbs)    0.87
Rough Slate                80kg (176lbs)         80kg (176lbs)   1.0