The reason why DEGDME is used in antifreeze is because of its unique properties. It has a low freezing point and can dissolve a large number of substances, making it an ideal solvent for preserving liquids from freezing. Additionally, DEGDME is non-toxic and biodegradable, making it a safer option than other chemicals commonly used in antifreeze.

In terms of cost, DEGDME can be quite expensive compared to other antifreeze additives. However, this price difference is due to the high purity and quality of DEGDME required for its use in antifreeze. As such, while it may be more expensive upfront, the long-term benefits of using DEGDME as an antifreeze additive are well worth the investment.

When considering which DEGDME product to purchase, it's important to do some research and compare different brands and formulations. Some popular brands that offer DEGDME include AMINES, CHINA AMINES, and others. Each brand may have slightly different prices and qualities, so it's important to read reviews and testimonials to make an informed decision.

Overall, the use of DEGDME in antifreeze is a complex process that requires careful consideration of various factors, including safety, cost, and efficacy. While the initial cost of using DEGDME as an antifreeze additive may be higher, the long-term benefits of preserving liquids from freezing are well worth the investment.