Minerit-HD is a low cost high density fiber reinforced cement board that is available in a variety of sheet sizes and thicknesses. It is the least expensive cement board offered by Foundry Service, but still offers high strength, good insulating value, and excellent machinability. It is non-conductive, has a smooth surface finish, and can be cut and machined using standard shop tooling. It is stocked in thicknesses from 1/8 (4mm) up to 3/8 (10mm) in 4 x 8 and 4 x 10 sheets. Common applications include fume hood liners, machined electrical insulating components, platen press insulation, and heat-resistant bases, tops, and liners.
Properties based on 1/4″ material
Specifications
| Modulus of Rupture ( psi ) | CMD - 2500 MD - 3200 |
|---|---|
| Water Absorption | 6 to 18% (oven dry - saturation) |
| Compressive Strength ( psi ) | 11600 |
| Dry Density ( lb/ft³ ) | 105 |
| Standard Sizes ( ft ) | 4 x 8 4 x 10 |
| Sheet Thickness ( in ) | 5/32 1/4 5/16 3/8 |
| Normal Moisture Content ( % ) | 5 |
| Modulus of Elasticity ( psi ) | 1.4 x 106 |
| Tensile Strength (Parallel to Surface) ( psi ) | CMD - 1600 MD - 2300 |
| Impact Strength ( lb-ft/ft² ) | 230 |
| Thermal Conductivity ( BTU-in/hr-ft²-ºF ) | 2.1 |
| Coefficient of Thermal Expansion (68ºF to 212ºF) ( in/in/ºF ) | 5.0 x 10-6 |
| Moisture Movement (Oven Dry - Saturation) ( in/ft ) | 0.04 |
| Surface Burning Characteristics (Class I) | Flame spread - 0 Smoke developed - 0 |
| Continuous Maximum Temperature ( ºF ) | 250 |
| Non Combustible | ASTM E 136 |
| Surface pH | 11 |
Note
Properties based on 1/4″ material.
Wind Load/Fastening Schedule
| Wind Load lbs/ft2 | Board Thickness (in) | Fastener Type | 24″ O.C. | 16″ O.C. | |||||
| P | C | P | P | C | C | P | |||
| 20 | 1/4″ | Screw | 8″ | 12″ | 8″ | 12″ | 16″ | 16″ | 12″ |
| 40 | 5/16″ | Screw | 8″ | 12″ | 8″ | 12″ | 16″ | 16″ | 12″ |
| >40 | 3/8″ 1/2″ | Screw | Must be calculated for each system. |
Fasteners must never be positioned closer than 1/2″ from thcell namedge, or 3″ from the corner of a panel.
Use stainless steel screws with 3/8″ diameter washer head. Holes must be predrilled into sheet with clearance around screw threads.
Standards & Performance
ASTM E 136-81
Minerit Heavy Duty cement board Non-combustibility test for building materials.
ASTM E 136-81
Minerit Light Weight cement board Non-combustibility test for building materials.
ASTM E 136-81
Minerit Multi Purpose cement board Non-combustibility test for building materials.
BS 476: Part 23:1987
Methods for determination of the contribution of components to the fire resistance structure. Loadbearing suspended ceiling (30 minutes) BGSI5054.
4/89 British Gypsum
Institute Fur Bautechnik Berlin Germany, October 1987
No. PA-111 4.518 for MP & HD Non-combustibility test for building materials.
Institute Fur Bautechnik Berlin Germany, October 1987
No. PA-III 2.2120 for MP & HD Surface Spread of flame test for building materials.
BS 476: Part 21:1987
Methods for determination of the fire resistance of loadbearing elements of constructions. Loadbearing joists floor system with a ceiling of Light Weight board. Timber joists floor (30 min.) BGSI5055 4/89. Timber joists floor (60 min.) BGSI 5047 11/88. British Gypsum UK
BS 476: Part 22:1987
Methods for determination of the fire resistance of non-loadbearing elements of constructions.
A fire resistance test on a non-loadbearing; metal stud partition faced with Multi Purpose or Light Weight board. 1/2-1 hour fire rating. A fire resistance test on a non-loadbearing timber stud partition using rock wool insulation and faced with Multi Purpose or Light Weight board. 1/2-2 hours fire rating.
Ceramic Tile Institute
Approval for Special Performance board
Uniform Building Code Approval Department of Civil Engineering, San Jose State University
Simulated wind load test. Minerit Heavy Duty wall panels. All reports available upon request.