China good quality upvc raw material, upvc windows profile ,upvc doors on China WDMA exterior How can you guarantee the

How can you guarantee the quality

Having a very professional engineer team(about 15 engineers)

Quality and service are request for ourself

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China good quality upvc raw material, upvc windows profile ,upvc doors on China WDMA exterior How can you guarantee theproduction information Certification ISO 9001: 2000 Type Door & Window Frames Model number 60,80,88 Material Extruded PVC or UPVC Feature High UV resistant, good aging resistant super solarization resistant never fade in 50 years, easy installation color white,double colors and strip co extrusion Payment L C at sight, T T (30% deposit, balance against the copy of B L) Application Building windows & doors and other plastic frame Packing plastic bubble