A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Address
Room 308, Building C5, Industry-University-Research Base, No. 9 Haichuan Road, Liuxing Sub-District, High-Tech Zone, Jining City, Jining, Shandong, China, 272000