Monroe Fluid Technology Astro-Cut B 5 Gallon Pail of Semisynthetic Cutting & Grinding Fluid for CNC Milling, Drilling, Tapping, and Turning. 
ASTRO-CUT B is a semi-synthetic BIOSTABLE general purpose metalworking coolant containing approximately 20% mineral oil. This product, when diluted with water, forms a translucent amber emulsion which offers excellent workpiece visibility, good lubricity, and superior cooling. ASTRO-CUT B is designed for the machining and grinding of virtually all metals, except magnesium and is formulated without the use of chlorine, phenols, nitrites or DCHA.
ASTRO-CUT B is designed for use in all metalworking applications such as CNC milling, turning, drilling, tapping and grinding. ASTRO-CUT B is also excellent on cast iron and sawing applications.