Mono and Diglyceride, also called 'Glycerin Flakes' and do not actually contain glycerin. Made with fully hardened fatty acids (typically vegetable oils) attached to glycerol.
Used as food additives to emulsify fat molecules with water. Also used as a powerful emulsifier for foaming oils.
To use it must be dissolved in oil before being added to water. The flakes must be about 2% of oil, by weight, and il must be at least 60°C (140°F) or more to dissolve.