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Glossary

Mandrel

The core around which paper-, fabric-, or resin-impregnated glass is wound to form pipes, tubes, or vessels; in extrusion, the central finger of a pipe or tubing die.


Mat

A fibrous reinforcing material comprised of chopped filaments (for chopped-strand mat) or swirled filaments (for continuous-strand mat) with a binder to maintain form; available in blankets of various widths, weights, and lengths.


Mat Binder

Resin applied to glass fibre and cured during the manufacture of mat, to hold the fibres in place and maintain the shape of the mat.


Mat Strength

Ability of the mat to resist being pulled apart under tension during impregnation and moulding.


Matched Metal Moulding

A reinforced plastics manufacturing process in which matching male and female metal moulds are used (such as compression moulding) to form the part, as opposed to low pressure laminating or spray-up.


Matrix

The material in which the fibre reinforcements of a composite system are embedded. Thermoplastic and thermoset resin systems can be used, as well as metal and ceramic.


Metal-Matrix Composites

Materials in which continuous carbon, silicon carbide, or ceramic fibres are embedded in a metallic matrix material.


Milled Fibre

Continuous glass strands hammer milled into very short glass fibres. Useful as inexpensive filler or anticrasing reinforcing fillers for adhesives.


Monomer

A simple molecule which is capable of reacting with like or unlike molecules to form a polymer; the smallest repeating structure of a polymer; for addition polymers, this represents the original unpolymerised compound.


Mould

The cavity or matrix into or on which the plastic composition is placed and from which it takes form. To shape plastic parts or finished articles by heat and pressure. The assembly of all the parts that function collectively in the moulding process.


Mould Shrinkage

The immediate shrinkage which a moulded part undergoes when it is removed from a mould and cooled to room temperature; the difference in dimensions, expressed in inches per inch between a moulding and the mould cavity in which it was moulded (at normal temperature measurement); the incremental difference between the dimensions of the moulding and the mould from which it was made, expressed as a percentage of the dimensions of the mould.


Mould Surface

The side of a laminate that faced the mould (tool) during cure.


Mould-Release Agent

A lubricant, liquid, or powder (often silicone oils and waxes), used to prevent sticking of moulded articles in the cavity.


Moulding

The forming of a polymer or composite into a solid mass of prescribed shape and size by the application of pressure and heat for given times. Sometimes used to denote the finished part.


Moulding Compounds

Plastics in a wide range of forms to meet specific processing requirements. Granules or pellets are popular forms.


Moulding Cycle

The period of time occupied by the complete sequence of operations on a moulding press requisite for the production of one set of mouldings; the operations necessary to produce a set of mouldings without reference to the time taken.


Moulding Pressure, Compression

The unit pressure applied to the moulding material in the mould. The area is calculated from the projected area taken at right angles to the direction of applied force and includes all areas under pressure during complete closing of the mould. The unit pressure is calculated by dividing the total force applied by this projected area, and is expressed in pounds per square inch.


Multifilament

A yarn consisting of many continuous filaments.


Multiple-Cavity Mould

A mould with two or more mould impressions; that is, a mould which produces more than one moulding per moulding cycle.