New environment-friendly water-based varnish: excluding ketones, volatile organic compounds were very low; durability and good abrasion resistance, surface hardness of up to 2H.
新型环保水性清漆： 不含酮，有机挥发物含量极低；耐久性和抗磨损性好，表面硬度可达2H。
2
The water from the Songhua River system in Jilin Province features lowhardness and low alkalinity and turns to water of scaling type when its enrichment factor is above4.
吉林松花江水系水质为低硬低碱水质特点，浓缩倍数大于4时转为结垢型水质。
3
Device features: high softening rate, low outlet waterhardness, simple and convenient regeneration and operation, high automation level.