Quartz is not specifically named, and the product's exact ingredients and pH are unavailable.
Why
The cleaner is intended for washable household surfaces and explicitly includes countertops and counters. Ordinary sealed quartz is reasonably expected to tolerate this type of all-purpose cleaner when used as directed.
What to do
Use on sealed quartz only; spray and wipe as directed, avoid prolonged wet contact, and rinse food-contact surfaces with water. Spot-test first, especially on textured, damaged, or unusual finishes.
pH
No pH value available in official evidence.
Relevant chemistry
Official evidence supports cleaning, sanitizing, and disinfecting claims; specific ingredients and pH were not provided.
Source: official product page ↗