GLOSSARY OF TERMS
M

Mandrel: the core tool around which resin-impregnated paper, fabric, or fiber is wound to form pipes, tubes, or structural shell shapes.

Mat: a fibrous material for reinforced plastic. Schmelzer Industries produces non-woven mats for foam reinforcement.

Matched metal molding: a reinforced plastics manufacturing process in which matching male and female metal molds are used (also called compression molding) to form the part, with time, pressure, and heat.

Matrix: the resin component of a polymer composite. Both thermoplastic and thermoset resins may be used, as well as metals, ceramics, and glasses. The plural is matrices.

Mat Strength: ability of the mat to resist being pulled apart under tension during impregnation and molding.

Mechanical properties: the properties of a material, such as compressive and tensile strengths, and modulus, that are associated with elastic and inelastic reaction when force is applied. The individual relationship between stress and strain.

Metallic fiber: manufactured fiber composed of metal, plastic-coated metal, metal-coated plastic, or core completely covered by metal.

Microballoons: microscopic bubbles of glass, ceramic or phenolic, used as a filler or to create syntactic foam or putty mixtures.

Microcracking: crack formed in composites when thermal stresses locally exceed the strength of the matrix.

Mil: the unit used in measuring the diameter of glass fiber strands ( 1 mil = 0.001 in.). Schmelzer Industries products are available in a range from 3 to approximately 50 mils.

Milled fiber: continuous glass strands hammer milled into very short glass fibers. Useful as inexpensive filler or anticrazing reinforcing filler for adhesives.

Modulus, initial: the slope of the initial straight portion of a stress strain or load-elongation curve.

Modulus of elasticity: describes a materialís ability to bend without losing its ability to return to its original physical properties.

Moisture content: the amount of moisture in a material determined under prescribed conditions, and expressed as a percentage of the mass of the moist specimen, that is, the mass of the dry substance plus the moisture present.

Mold: the cavity or matrix into or on which the plastic composition is placed and from which it takes form. The tool used to fabricate the desired part shape.

Molded edge: an edge that is not physically altered after molding for use in final form, and particularly on that does not have fiber ends along its length.

Molding: the forming of a polymer or composite into a solid mass of prescribed shape and size.

Molding cycle: the period of time required for the complete sequence of operations on a molding press to produce one set of moldings.

Molding pressure: the pressure applied to the ram of an injection machine or compression or transfer press to force the softened plastic to fill the mold cavities completely.

Mold-release agent: a lubricant, liquid, or powder (often silicone oils and waxes), used to prevent sticking of molded articles in the cavity.

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