Greenhouse covering material: 1, ordinary film: polyethylene or polyvinyl chloride as raw steel shed construction, the thickness of 0.1 mm, colorless and transparent. Life of about six months. 2, multi longevity film: polyethylene blow molding process in an appropriate amount of anti-aging material and surfactant made life than twice the length of ordinary steel shed membrane at night than other materials Pengwen high 1-2 ℃. And the film is hard to form droplets, good coverage. Features greenhouses: the greenhouse air component. Ammonia and nitrogen dioxide to produce steel shed construction companies, mainly due to the improper use of nitrogen fertilizer. Carbon monoxide and sulfur dioxide to produce steel sheds offer, primarily with coal fire heating, combustion is incomplete, or poor quality coal caused. Due to the aging of the film (plastic tube) may release ethylene, causing premature aging plants, so the excessive use of vinyl products is one of the reasons. Steel shed manufacturers, Communications Technology (certified), Zhengzhou steel shed by Anyang City Communications Technology Limited. Anyang City Communications Technology Co., Ltd. (www.aytlkj.com) is Anyang, a leader in agricultural supplies, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Communications technology leadership in the staff warmly welcome all inquiries negotiations to create a better future for Communications Technology.