I think I would look at this from the other end.  Not what quality / product safety checks they do during or after the manufacturing process, but how they have designed quality and safety into the product.  So for example I might want to know if they have determined a safe working load for the equipment through design calculations and proved it by testing a prototype or sample in the past .  And I might want to see some form of manual or user guide or data sheet that described the correct use of the product and any in-use inspection recommendations.

If the supplier has ISO 9001 certification, then they ought to be complying with the clause on design and development of products and services and be able to prove this.  It's clause 8.3 if you want to look it up and it sets out a general process for how products should be designed (structured on design inputs and design outputs)  together with a requirement to document this.

Originally Posted by: zoebendle@gmail.com

if there is anything we could be doing ourselves to ensure the product is safe or whether we should avoid selling on and send our customers directly to the manufacturer of the display racks?

SI 2005 No 1803 The General Product Safety Regulations 2005 - your company would be considered "market supplier" https://www.legislation.gov.uk/uksi/2005/1803/contents

For most storage racking there is no current conformity assessment (CE/UKCA) mark applicable and no supporting standards (exception is EN 1090-1 where permanent racking forms part of the building structure).

Therefore you would have to derive how your company ensures the product is safe for supply under GPSR.

I would caution against directing customers to a particular supplier as this could be construed as recommendation. Instead provide technical information (weight, length, diameter, core size) for your products so the customer can discuss requirements directly with their chosen system suppliers.