The preventive vaccines market has attained maturity in some of the disease segments, like polio, while for some diseases, it is yet to establish itself in the market. In spite of these differences in each segment, the market is continuously growing, due to the exponential growth that is varying, with respect to the demand for vaccination for separate diseases over time.

A chimney cap is a covering for the top of a chimney and is used in both residential and commercial environments. It is equipped with flue cover, crown, and mesh, which is installed upon flue located on chimney chase. Chimney caps are also known as chimney tops, chimney toppers, and flue caps. It comes in stainless steel or copper body to prevent water penetrations due to rain and snowfall. It is majorly used in industries where the industrial furnace and steam-generating boiler are installed.

3 月份，新材料行业运行平稳，高温合金产量大幅增长；多晶硅产量逐渐恢复；稀土催化材料产量平稳增长；动力电池装机总电量为 5.09GWh，同比增长 145%。进出口方面，受国内经济放缓和抢跑效应消退影响，光电材料进出口金额都开始放缓；特钢进口和出口同比双双下滑；碳纤维进口增速回暖，出口波动较大。投融资方面，科创板有望成为新材料企业的融资高地。价格方面，化工新材料价格略有下滑、特钢受汽车需求回暖影响小幅回升；多晶硅在需求旺盛的带动下逐渐回暖，价格触底反弹。资本市场方面，随着股市反弹，新材料板块继续上涨。

本周钢价整体表现相对抗跌，尽管周一到周三期货出现下跌，但周四周五仍出现反弹。整体的钢价表现强于预期。库存方面，本周公布的我的钢铁库存为1735.34 万吨，环比去化66.97万吨，结束了连续3 周库存去化超100 万吨的情况。同时，产量继续增加达1051 万吨/周。

根据Mysteel统计数据，2019年4月26日，全国70家样本矿山企业铁精粉日总产量8万吨，较上次统计下降5.37%；产能利用率45.80%，环比下降2.61个百分点；总库存39万吨，环比下降3.75%。2019年4月15日-4月19日，海外铁矿石发货总量2124万吨，环比增加238万吨，其中澳洲1762万吨，增加234万吨；巴西362万吨，增加3万吨；印度0万吨，与上次统计持平。2019年4月26日，全国主要港口铁矿石库存总量13427万吨，环比减少410万吨，其中澳矿6328万吨，减少294万吨，巴矿4266万吨，减少24万吨。