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What is the difference between DOT4 and DOT5.1?

1 Answers

StevenRose

07/29/25 5:38pm

Different compositions. Here are the specific introductions: 1. DOT4: Generally ester-based: The ester type adds a large amount of borate ester on the basis of the alcohol ether type. Borate ester is formed by the esterification reaction of low-polyethylene glycol or propylene glycol with boric acid. The boiling point of borate ester is higher than that of low-polyethylene glycol or propylene glycol, so its braking performance is better. Borate ester also has strong moisture resistance, which can decompose the absorbed water, thereby slowing down the boiling point drop caused by water absorption. Therefore, the ester type performs better than the alcohol ether type, and the price is also higher. 2. DOT5.1: Generally silicone-based: It is refined from high-cost silicone base oil, with strong high-temperature resistance and water absorption resistance, and can withstand relatively strong conditions. However, DOT5.1 is generally used for professional racing or military purposes, and is basically not available on the market, so it can be ignored.

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