Guangzhou Casen Door CO.,LTD places great importance on raw materials used in the manufacturing of hdf doors-modern exterior doors. Each batch of raw materials is selected by our experienced team. When raw materials arrive at our factory, we take good care of processing them. We totally eliminate defective materials from our inspections.. To expand our Casen brand, we conduct a systematic examination. We analyze what product categories are suitable for brand expansion and we make sure these products can offer specific solutions for customers' needs. We also research different cultural norms in the countries we plan to expand into because we learn that foreign customers' needs are probably different from those of domestic.. 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..