Glass Weight and Suction-Cup Lifter Count
Glass weight and the suction-cup lifter count it takes: weight = area x thickness x density (~13 lb/ft^2 per in for soda-lime); cups = ceil(weight x safety factor / cup working load). A 4 x 8 ft insulated unit with a half-inch of total glass weighs 208 lb and at a 4:1 safety factor on 150-lb cups needs 6 cups; a monolithic 1/4 in lite of the same size is 104 lb and 3 cups. The safety factor and cup WLL come from the lifter manufacturer; a competent person and the rated lifter govern the pick.
Formula and source
weight_lb = area_sf x glass_thickness_in x glass_density_psf_in; cups = ceil(weight_lb x safety_factor / cup_wll_lb).
Suction-cup lifter identity by name (glass weight from area x thickness x density; cups from weight at a safety factor over the cup WLL); first-principles arithmetic.
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