RCMHD (High Density) is a rigid, high density, high performance fibre cement building board, which provides greater strength and weathering characteristics over that of our Multi Purpose board.
HD has a very extensive range of uses from external applications, soffits, semi exposed application, laminating, floors, roofs and for sheathing board applications where additional strength is more critical.
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Technical Data |
Basic Composition - RCMHD is made from specially treated high grade cellulose fibre, Portland cement, refined sand and water.
General Properties - RCMHD with a stable crystalline structure is highly resistant to water penetration, humidity, rot, insects, termites, vermin and is fire rated class 0.
When painting the board or lamination, we recommend the use of an alkali resistant paint/primer or cement sealer, so no reaction can occur between the boards and treatment
Machine-ability - RCMHD (High Density) is a very strong versatile semi-exposed / external building board. It may be cut, (recommend tungsten tipped blade) drilled and nailed on site, however for extensive cutting of the product we recommend the boards is cut with more specialised equipment (possibly off site) due to the boards very strong characteristics.
Applications - RCMHD readily accepts a variety of surface finishes including paint and textured coatings.
Maintenance - Low.
Health & Safety - Appropriate health and safety precautions must be adhered to when working with this product (see lifting and handling section). Suitability: Sheathing | Acoustic Roofing | Laminate | Ceilings | Soffits | External Cladding |
| Nominal density |
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1400-1480 kg/m3 |
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| Bending Strength (Modulus of Rupture) |
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21.0Mpa |
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| Modulus of Elasticity (MoE) |
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6.8 GPa |
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| Thermal Conductivity |
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0.35W/mk |
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| Moisture Content |
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8% |
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| Moisture Movement (EMC to Saturated) |
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0.06% to 0.10% |
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| Fire Rating |
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BS476 Part 6 & 7 Class 0 material |
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| Fungus attack |
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Highly resistant |
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| Termite attack |
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Highly resistant |
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| Frost resistance |
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5 star |
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| Surface Condition |
Front face |
Smooth |
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Back face |
Textured |
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| Durability (life expectancy - minimum) |
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30 years |
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| Standard board size |
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2400 x 1200mm |
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| Thickness (mm) |
4.5 |
6 |
9 |
12 |
| Weight (kg/m2) |
6.6 |
8.7 |
13.1 |
17.4 |
| Sound insulation (dB) †|
23 |
26 |
29 |
31 |
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| Dimensional Tolerance |
Length |
+2 -2 mm |
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Width |
+2 -2 mm |
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Thickness |
± 0.5mm |
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