Answer:

Heat conductivity is the property that indicates how well a material insulates. It is denoted by the Greek letter lambda λ and the unit is W / m · K. Lambda value is independent of the thickness of the material. The lower the lambda value, the better the insulation material. 

KIMMCO-ISOVER stone wool insulation for construction purposes has declared lambda value in accordance with EN 13162  & ASTM C 612 "Thermal insulation products for buildings - Factory-made mineral wool products (MW) - Property Reporting"  & Standard Specification for Mineral Fiber Block and Board Thermal Insulation.
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