English to Spanish Tech/Engineering Petroleum Eng/Sci Biochemical treatment

Can someone help me with the term BUILDERS in the following list of properties?
Here is the context:

BIOCHEMICAL TREATMENT:
Chemical Qualities:
-Water-based, biodegradable blend of surfactants
-Emulsifies and encapsulates hydrocarbons, fats, oils, and grease instantly
-Does not contain builders, petroleum distillates, caustics, acids, tall oils, d-Limonene, or nitrates.

Thanks so much!!