PEG 4000 and PEG 6000 are used the same purpose, what is the difference between them?

Polyethylene glycol 4000 and polyethylene glycol 6000 are products belonging to the polyethylene glycol PEG series, which are used in the pharmaceutical industry for the preparation of suppositories and pastes; used as finishing agents in the papermaking production process; used as additives in the rubber processing process to increase the lubricity and plasticity of rubber products; used as a matrix in the production of cosmetics industry; dispersants and emulsifiers in the production of pesticides and pigments; used as antistatic agents and lubricants in the textile industry.

Polyethylene glycol 4000 is referred to as PEG4000, the appearance is milky white solid; the taste is slightly odorous. Easily soluble in water or ethanol, insoluble in ether. Its freezing point is 53 to 54, and its molecular weight is 3500 to 4400.

Polyethylene glycol 6000 referred to as PEG6000, the main chemical component is ethylene oxide and hydrocodenum polymer formed, 6000 refers to its average molecular weight of 6000, the range is 5500 ~ 7000, the molecular formula is HO (CH2CH2O) nH is represented, where n represents the average number of oxygen vinyl groups. It is a non-toxic, non-irritating, widely used in a variety of pharmaceutical preparations.