► History of Coolant Base Fluid Development：/冷冻液基础液的发展历史：
 
· Alcohols 醇    低沸点，易燃
- Disadvantages: Low Boiling Point; Potential Fire Hazard
· Salts 盐    易致锈，易结晶沉淀
- Disadvantages: Corrosiveness; Deposits by Cristallisation
· Glycerine 甘油    粘度高，防冻差，与橡胶不相容
- Disadvantages: High Viscosity; Less Freezing Protection; Incompatibility with Rubber Hoses
 
The Solution: Mono Ethylene Glycol / 解决方法：乙二醇
BASF Patent granted in 1929. Brand Name:Glysantin / 巴斯夫于1929年取得专利 商品名称: GLYSANTIN
 
► Characteristics of Good Engine Coolants:/优秀发动机冷冻液的特点:
 
· Prevention of Corrosion/防锈
· Prevention of Cavitation/抗汽蚀
· Prevention of Over-heating/防过热
· Excellent Heat Transfer/良好的导热性
· Stability at high Temperature/高温稳定性
· Compatibility with Hard Water/对硬水的高容忍性
· Little Swelling of Rubber and Elastomeres/不会引起橡胶及高弹体的明显膨胀
· Low Foaming Tendency/低泡
· Prevention of Deposits/防沉淀
· Freeze Protection/防冻
 
► Basic Formulation of Coolants/冷冻液的基本组成：
 
1. Base Fluid/基础液（Mono EthyleneGlycol/乙二醇），> 90% + Additives/添加剂（Surface activeInhibitors prevent/表面活性抑制剂(Corrosion/防锈、Cavitation/防汽蚀、Deposits/防沉淀；Others/其他：pH Buffer/缓冲pH、Defoamer/消泡、Stabilizer/稳定)），5-7% + Water/水（as by-productsfrom components/反应副产品），3 - 5% = Coolant Concentrate/原液.
 
2. Coolant Concentrate原液(30 – 60%) + Water 水(40 – 70%) = Coolant/冷冻液(ready to use/即用型).