Quartz stone is composed of about 93% ground quartz and 7% resins, to get a high hardness, and keep the countertops from scratching and staining, quartz countertops do not require sealing also.
There is one point we need to make clear, quartz countertops are heat resistant, but not heat-proof, the surface just can stand limited exposure to hot items. Something like warm plate will not cause a problem. Nevertheless, if you place the searing pot and frying pan on the quartz countertops directly, the surface will be damages, which will make the surface scorch marks and color fading.
So just remember to use one pad or trivet to protect your quartz countertops when you want to place something hot on it.
Leadstone USA Inc is specialized in producing quartz countertops, welcome to visit us at http://www.leadstoneusa.com