What chair mat materials are safe for this floor? Is Polypropylene (PP, #5) safe?

Hello Mattk and thank you for your inquiry. We encourage you to use floor mats with breathable materials and smooth surfaces. Mats with a non-slip backing and moisture-wicking fabric prevent movement and staining. Avoid mats with natural rubber backings unless they are specified as vinyl-safe, as rubber can cause discoloration to the LVP flooring over time. Hope this helps. Thanks again for choosing Style Selections Luxury Vinyl Plank.