MDF (stands. Medium Density Fiberboard - CD medium density fiber) is a wood-based material made by compressing with the use of temperature lignocellulosic fibers (mostly derived from wood but also of annual plants) with adhesive. The most common used binder is amino resins (urea-formaldehyde, melamine-urea-formaldehyde). MDF is commonly used in relation to the family of dry-formed fiberboard.Variations of MDF boards are LDF and HDF boards.
The names of the LDF and HDF derive from different density plastic. LDF plate (stands for Low Density Fiberboard) is a fiber board with low density (also known as L-MDF) and HDF (stands for High Density Fiberboard) is a board of high-density fiber. Ultralight MDF plate is referred to as ULDF.
Type of MDF panels have a single layered structure, ie. are formed of one type of particles. Such a structure allows the use of panels for production of furniture fronts, where the necessity of milling broad surfaces occurs. There are methods to produce MDF boards that are made with presses calender, however usually they are produced in a flat press technology.
Methods of refining
Veneered in other material: laminate (CPL, HPL, melamine film), artificial veneer (on paper, foil), natural veneer (veneer), coating material with paint and varnish.
Plates LDF - less than 650 kg / m3.
MDF - from 650 to 800 kg / m3.
HDF - over 750 kg / m3
The PN-EN 622-5 distinguished the following types of dry-formed fiberboard (MDF): general purpose board used in dry conditions (type MDF) or wet (type MDF.H), load bearing panels for use in dry conditions ( MDF.LA type) or humid (MDF.HLS), light MDF boards for use in dry conditions (type L-MDF) or wet (type L-MDF.H), ultralight MDF board for use in dry conditions (type UL1- MDF and UL2-MDF) and board for use as a stiffening sheathing, roofing and walls (type MDF.RWH). In addition, some manufacturers have in their offer panels with improved performance in terms of reaction to fire
Sheets with dimensions (depending on the manufacturer and finish): the width 2070 mm, length 2500 2800 mm in the thickness range of 6 - 38 mm and 2850x2070 mm 2, 2500x1830 mm 2 in the thickness range of 1.5-5 mm (HDF); Some manufacturers allow the production of forms and formats as requested by customers.
Transport and Storage
It is recommended to protect transported and stored MDF against rain and moisture. When transporting the narrow surfaces and corners of the plates should be protected against damage. Store in closed, dry rooms, in a flat position.
Health and safety
During the machining of MDF there is a risk of dust. MDF also have a non-zero content and emission of formaldehyde.
ISO 3340 - 1976 - Determination of sand content
BS EN 120: 1994 Plastics Wood. Determination of formaldehyde content. Extraction method called perforator method
BS EN 310: 1994 Fiberboard. Determination of flexural modulus and flexural strength
BS EN 311: 2004 Fiberboard. Peel strength of the surface layer. The test method
BS EN 317: 1999 chipboard and fibreboard. Determination of the swelling of the thickness after soaking in water
BS EN 318: 2004 Fiberboard. Determination of dimensional changes caused by changes in relative humidity
BS EN 319: 1999 chipboard and fibreboard. Determination of tensile strength perpendicular to the plane of the sheet
BS EN 320: 2011 chipboard and fibreboard - Determination of the resistance to the axial pulling the screws
BS EN 321: 2004 Fiberboard. Determination of the resistance to moistureconditions in repeated test
BS EN 322: 1999 Fiberboard. Determination of moisture
BS EN 323: 1999 Fiberboard. Determination of density
BS EN 382-1: 2001 Fibreboard. Determination of surface absorption - Part 1: Test method on dry-formed fiberboards
BS EN 622-1: 2005 Fibreboard. Technical requirements - Part 1: General requirements
BS EN 622-5: 2007 Fibreboard. Technical requirements. Part 5: Requirements for dry-formed panels (MDF)
BS EN 717-2: 1999 Fiberboard. Determination of formaldehyde. Formaldehyde emission by the gas analysis
BS EN 717-3: 1999 Fiberboard. Determination of formaldehyde. Formaldehyde emissions using the bottle method
BS EN 13271: 2002 Connectors for timber. The characteristic of resistance and module susceptibility of connectors
BS EN 13446: 2004 Fiberboard. Determination of ability to withhold connectors.
BS EN 13986: 2006 Fiberboard for use in constructions. Properties, conformity assessment and marking