In the Spring of 2019, Colonial Wall Linings began supplying HMR (Highly Moisture Resistant) MDF Wet Room VJ Linings.
The key difference (between MR MDF and HMR MDF) is that the polyurethane – based resin (MDI) (used in HMR MDF) does not break down in the presence of moisture (i.e. a chemical bond with the wood fibres).
All wood and wood-based products react to moisture and HMR MDF is no exception. Wood cells expand and shrink slightly in width and length as they absorb or lose moisture. This phenomenon is not full reversible, as relieved stresses do not completely recover.
The specially formulated MDI resin used in the production of HMR MDF, increases the physical properties and durability of MDF and increases protection against thickness swell to create a premium composite panel for demanding conditions.
Wet Room VJ Linings
(HMR MDF) are designed for use in areas that are protected from direct exposure to the weather. E.g. Kitchens, laundries, bathrooms, verandah ceilings. (MDF VJ Ceilings by their nature, require more prep and installation method than VJ walls.)
We conducted our own in house submersion test with off cuts of the HMR MDF Wet Room VJ Linings. Samples were submerged from 8 August 2019 until 29 January 2020. The samples were retrieved and air dried. They were stable, robust and dimensionally back to within acceptable tolerances. (+0.4mm)
Colonial Wall Linings markets the HMR MDF product as “Wet Room VJ Linings”. Three sizes are available: 2400 x 1200 x 9mm, 3000 x 1200 x 9mm and 3600 x 1200 x 9mm the profile is “VJ” spaced at 100mm centres.
Colonial Wall Linings’ HMR (Highly Moisture Resistant) MDF Wet Room Linings are also available in Traditional Beaded & Special Centres at 63mm, 70mm, 86mm, 92mm, 100mm, 140mm & 150mm.
A good long term result and service life on these and all of our products depends on quality preparation and installation.
Our installation instructions give an overview to help you achieve great long-term results.
The MSDS on these products and more expansive technical data is available on request.
Please phone our office on 3266 4324.