MR-MDF stands for Moisture Resistant Medium Density Fibreboard. It is a type of MDF (Medium Density Fibreboard) engineered to have better resistance to moisture compared to standard MDF, making it suitable for applications in humid and moist environments.

Standard MDF:
Made from wood fibers, wax, and resin, compressed under high heat and pressure.
Denser than plywood but easy to cut, shape, and sand.
Used in the fabrication of cabinets, doors, and other furniture elements, especially when a smooth finish is required.
Susceptible to damage when exposed to water or high humidity.

MR-MDF:
Similarly made from wood fibers, but with modified resins to impart moisture-resistant properties.
It can be used in areas with occasional, transient exposure to moisture, like bathrooms and kitchens, as it can better withstand humid conditions.
Not entirely waterproof, so prolonged exposure to water can still cause damage.
Differences between MR-MDF and Standard MDF:
Moisture Resistance:

MR-MDF is designed to resist moisture better than standard MDF.
Standard MDF absorbs water more readily, swelling, and losing structural integrity.
Application:

MR-MDF is suitable for environments with higher humidity or occasional exposure to moisture, like kitchens and bathrooms.
Standard MDF is suitable for dry environments and is not recommended for use where it may be exposed to water or high humidity.
Cost:

MR-MDF may be more expensive due to its enhanced properties.
Resin Composition:

The resin used in MR-MDF is modified to provide better moisture resistance compared to the resin in standard MDF.
Remember, even though MR-MDF has better moisture resistance, it is not waterproof, so it is not suitable for outdoor use or areas with constant exposure to water. In such scenarios, a more suitable material would be Marine Plywood or another waterproof material.