三者的区分：使用广泛pH试纸检验除油剂的酸碱性。pH值大于9的，可以视为碱性除油剂；pH值小于5的，可以视为酸性除油剂；pH值在5~9之间的，可以视为中性除油剂。
Differentiation of the three: Use a wide range of pH test paper to test the acidity and alkalinity of degreasers. If the pH value is greater than 9, it can be regarded as alkaline degreaser; if the pH value is less than 5, it can be regarded as acidic degreaser; if the pH value is between 5 and 9, it can be regarded as neutral degreaser.
三者的区别：碱性除油剂组成中一般含有火碱或者通过水解产生氢氧根的盐类物质。酸性除油剂组成中一般含有无机酸或者有机酸，一般情况下含有有机酸的除油剂pH值较高。中性除油剂一般含有碱性比较若得金属盐类如碳酸氢钠等。
The difference between the three is that alkaline degreasers usually contain pyroalkali or salts that produce hydroxyl radicals by hydrolysis. The composition of acid degreaser usually contains inorganic acid or organic acid. Generally, the pH value of degreaser containing organic acid is higher. Neutral degreasers generally contain alkaline comparisons if metal salts such as sodium bicarbonate are obtained.
相同点：三者的主要目的都是为了除油，所以都含有表面活性剂。当然，不同的配方含有的表面活性剂的种类和含量不同。
Similarity: The main purpose of the three is to remove oil, so they all contain surfactants. Of course, different formulations contain different kinds and contents of surfactants.
使用：一般情况下，工件表面的油污比较重时或者比较难于清洗时，最好使用碱性除油剂。但是给有色金属除油时，必须注意除油剂对金属的腐蚀问题。酸性除油剂的除油能力最弱，一般不适合冷板，但比较适合于热轧板。中性除油剂的除油能力介于两者之间。需要注意的是，中性除油剂中的细菌容易繁殖，使用一段时间后除油剂会变臭，严重影响除油效果。三者都在加热的情况下对除油有利。
Usage: Generally speaking, alkaline degreaser is best used when the oil on the surface of workpiece is heavy or difficult to clean. However, when removing oil from non-ferrous metals, attention must be paid to the corrosion of degreasers on metals. Acidic degreaser has the weakest degreasing ability and is generally not suitable for cold plate, but it is more suitable for hot rolled plate. The degreasing capacity of neutral degreaser is between the two. It should be noted that the bacteria in the neutral degreaser are easy to multiply, and the degreaser will stink after a period of time, seriously affecting the degreasing effect. All three are beneficial to oil removal when heated.