Are twin slot brackets strong enough to support a shelf layout?

Are twin slot brackets strong enough to support a shelf layout? twin slot shelf
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twin spin slot free play The system is simple All you need are the uprights to fix to the wall and the brackets to slot in ready for the shelf to go on top Twin Slot Shelving

twin spin slot free Fairways Heavy Duty Twin Slot Shelf Bracket 370 x 100mm White has a twin slot 'Shelf-Lok' system that combines adjustability with strength & versatility  ALIJA® Twin Slot Channel Adjustable Rack with 3 Wooden Shelf Shelving Unit Multipurpose RackWall Mount Shelf Rack