Viscosity Index Improver Polymer (SHAMA)

As of my last knowledge update in September 2021, I don't have specific information about a viscosity index improver polymer called "SHAMA." It's possible that this is a product or term that has emerged after my last update, or it could be a less widely known or specialized term.

Viscosity index improver polymers are additives used in lubricants and oils to modify the viscosity-temperature relationship of the fluid. They help the oil maintain its viscosity (thickness) across a range of temperatures, which is particularly important for the efficient functioning of engines and machinery. This property is often measured using the viscosity index (VI), which quantifies how much the viscosity of the oil changes with temperature.

If "SHAMA" is a product name, a proprietary term, or a specialized industry jargon that has arisen after my last update, I recommend consulting the manufacturer or supplier of this product or connecting with experts in the field of lubricants and additives for the most up-to-date and accurate information.

Please provide more context or details if you have any, and I'll do my best to assist you based on the information available up to September 2021.