McKillican | Green Reference - Terms starting with the letter M

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Machine Stress-Rated (MSR)	Or Machined Evaluated (MEL). Lumber that has been graded by a machine to allow a more precise measure of strength for end uses where high strength is critical.
Manufactured Housing	Housing units partially or completely built in a factory.
Manufacturing Defects	Includes all defects or blemishes that are produced in manufacturing, such as chipped grain, loosened grain, raised grain, torn grain, skips in dressing, hit and miss (series of surfaced areas with skips between them), variation in
Marine Plywood	Plywood panels manufactured with the same glueline durability requirements as other exterior-type panels but with more restrictive veneer quality requirements.
Mastic	A material with adhesive properties, usually used in relatively thick sections, that can be readily applied by extrusion, trowel, or spatula. (See Adhesive)
Matched Lumber	Lumber that is edge dressed and shaped to make a close tongued-and-grooved joint at the edges or ends when laid edge to edge or end to end.
Material Safety Data Sheets (MSDS)	Source of information about material performance, including: toxicity, recycled content, IEQ impacts, and general safety issues.
Mat-Formed Particleboard	A particleboard in which the particles (being previously coated with the binding agent) are formed into a mat having substantially the same length and width as the finished panel. This mat is then duly pressed in a heated flat-platen press to cure the binding agent.
MDF	Medium density fiberboard.
MDI	MDI: Methylene diphenyl diisocyanate, most often abbreviated as MDI, is an aromatic diisocyanate. It exists in three isomers, 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. The 4,4' isomer is most practically useful, and is also known as Pure MDI. MDI is reacted with a polyol in the manufacture of polyurethane. In its raw form, MDI is the least hazardous of the commonly available isocyanates, as it has a very low vapour pressure. This reduces its hazards during handling compared to the other major isocyanates (TDI, HDI). However, it, like the other isocyanates, is an allergen and sensitizer. Persons developing sensitivity to isocyanates may have dangerous systemic reactions to extremely small exposures, including respiratory failure.
Mechanical Adhesion	Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.
Medium-Density Fiberboard	A panel product manufactured from lignocellulosic fibers combined with a synthetic resin or other suitable binder. The panels are manufactured to a density of 496 kg/m3 (31 lb/ft3) (0.50 specific gravity) to 880 kg/m3 (55 lb/ft3) (0.88 specific gravity) by the application of heat and pressure by a process in which the interfiber bond is substantially created by the added binder. Other materials may have been added during manufacturing to improve certain properties.
Melamine panel	This overlay category is referred to by many names including thermally fused melamine (TFM), low pressure, direct pressure or simply as melamine overlays. Sub categories include the names Polyester and Decorative Phenolics. Thermally fused papers generally weigh between 60 and 130 g/m2, and the paper formation is similar to the decorative sheet used for HPL. Thermally fused papers are saturated with reactive resins and partially cured at the point of manufacture to allow for storage and handling of the paper. Final curing is done at the time of hot press lamination when the resins form a hard, permanent thermoset bond between the paper and the substrate. No additional adhesives are required. Common end-use applications of thermally fused papers include laminate flooring, kitchen cabinets and countertops, shelving, store fixtures and home office furniture.
melamine resin	Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. This plastic often is used in kitchen utensils and plates (such as Melmac) and is the main constituent of high-pressure laminates, such as Formica and Arborite, and of laminate flooring. Melamine-resin tile wall panels can also be used as whiteboards. Melamine resin often is used to saturate decorative papers that are directly laminated onto particle board; the resulting panel often is called melamine and often is used in ready-to-assemble furniture and kitchen cabinets.
Melamine-formaldehyde	From Wikipedia: Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. This plastic often is used in kitchen utensils and plates (such as Melmac) and is the main constituent of high-pressure laminates, such as Formica and Arborite, and of laminate flooring. Melamine-resin tile wall panels can also be used as whiteboards. Melamine resin often is used to saturate decorative papers that are directly laminated onto particle board; the resulting panel often is called melamine and often is used in ready-to-assemble furniture and kitchen cabinets
Mende-Process Board	A particleboard made in a continuous ribbon from wood particles with thermosetting resins used to bond the particles. Thickness ranges from 0.8 to 6.3 mm (1/32 to 1/4 in.).
Microclimate	A unique set of climatic conditions caused by landscape/building features. For instance, a paved parking area will absorb and radiate heat to the areas around it. Vegetation can block heavy prevailing winds or funnel them into a concentrated area.
Millwork	Planed and patterned lumber for finish work in buildings, including items such as sash, doors, cornices, panelwork, and other items of interior or exterior trim. Does not include flooring, ceiling, or siding.
Mineral Streak	An olive to greenish-black or brown discoloration of undetermined cause in hardwoods.
MNECB	Model National Energy Code of Canada for Buildings.
Modified Wood	Wood processed by chemical treatment, compression, or other means (with or without heat) to impart properties quite different from those of the original wood.
Modular Housing	A type of housing in which major components are assembled in a factory and then shipped to the building site to be joined with other components to form the finished structure.
Moisture Content	The amount of water contained in the wood, usually expressed as a percentage of the weight of the ovendry wood.
Molecular Weight	The sum of the atomic weights of the atoms in a molecule.
Monomer	A relatively simple molecular compound that can react at more than one site to form a polymer.
Mortise	A slot cut into a board, plank, or timber, usually edgewise, to receive the tenon of another board, plank, or timber to form a joint.
Moulded Plywood	Plywood that is glued to the desired shape either between curved forms or more commonly by fluid pressure applied with flexible bags or blankets (bag moulding) or other means.
Moulding	A wood strip having a curved or projecting surface, used for decorative purposes.
MR4.1	MR Credit 4.1: Recycled Content: 10% (post-consumer + 1/2 pre-consumer). Intent: Increases the use of products that incorporate recycled content material. Requirements: Sum of recycled content constitutes at least 10% of materials in the project.
MR4.2	Materials and Resources MR Credit 4.2 Recycled Content: 20% (post+ 1/2 pre-consumer). INTENT: Increases the use of products that incorporate recycled content materials. REQUIREMENTS: Sum of recycled content constitutes at least 20% of materials in the project
MR5.1	Materials and Resources MR 5.1 Regional Materials: 10% Extracted, Processed & Manufactured Regionally. INTENT: Increases the use of materials that are extracted and manufactured within the project region. REQUIREMENT: A min. of 10% of the combined value of building materials or products must be extracted, harvested, or recovered, as well as manufactured within 500 miles of the project.
MR5.2	Materials and Resources MR 5.2 Regional Materials: 20% Extracted, Processed & Manufactured Regionally. INTENT: Increases the use of materials that are extracted and manufactured within the project region. REQUIREMENT: A min. of 20% of the combined value of building materials or products must be extracted, harvested, or recovered, as well as manufactured within 500 miles of the project.
MR6	USGBC LEED Intent: Reduce the use and depletion of finite raw materials and long-cycle renewable materials by replacing them with rapidly renewable materials. Requirements: Use rapidly renewable construction and Division 12 (Furniture and Furnishings) materials and products, made from plants that are typically harvested within a 10-year or shorter cycle, for 5% of the total value ($) of all materials and products used in the project.
MR7	Materials and Resources MR7: Certified Wood FSC - Forest Stewardship Council. INTENT:Encourage environmentally responsible forest management. REQUIREMENTS: Use a minimum of 50% wood based materials and products, which are certified in accordance with the Forest Stewardship Council’s (FSC) Principles and Criteria, for wood building components.
Multilayer Particleboard	A type of construction in which the wood particles are made or classified into different sizes and placed into the preprocessed panel configuration to produce a panel with specific properties. Panels that are destined for primarily nonstructural uses requiring smooth faces are configured with small particles on the outside and coarser particles on the interior (core). Panels designed for structural application may have flakes aligned in orthogonal directions in various layers that mimic the structure of plywood. Three- and five-layer constructions are most common.