Guangzhou Casen Door CO.,LTD strictly selects the raw materials of grey composite doors-hdf doors. We constantly check and screen all incoming raw materials by implementing an Incoming Quality Control - IQC. We take varies measurements to check against collected data. Once failed, we will send the defective or substandard raw materials back to suppliers.. With the rapid globalization, delivering a competitive Casen brand is essential. We are going global through maintaining brand consistency and enhancing our image. For example, we have established a positive brand reputation management system including search engine optimization, website marketing, and social media marketing.. At Casen wooden door, we offer expertise combined with personalized, one-on-one technical support. Our responsive engineers are readily accessible for all of our customers, large and small. We also provide a wide array of complimentary technical services for our customers, such as product testing or installation..