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Glossary of Terms

TGA– Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes.

The Thermogravimetric Analyzer (TGA) is an essential laboratory tool used for material characterization. TGA is used as a technique to characterize materials used in various environmental, food, pharmaceutical, and petrochemical applications.

The TGA is responsible for regulating therapeutic goods including medicines, medical devices, blood and blood products. … The TGA is responsible for regulating the supply, import, export, manufacturing and advertising of therapeutic goods. The ARTG contains therapeutic goods that can be lawfully supplied in Australia.

The Therapeutic Goods Administration (TGA) is part of the Australian Government Department of Health , and is responsible for regulating therapeutic goods including prescription medicines, vaccines, sunscreens, vitamins and minerals, medical devices, blood and blood products.


TR TEST– The TR test is a standard testing method for evaluating rubber properties at low temperatures. The test is mainly used to determine the brittleness point or the compression set and recovery behavior of elastomers. Normally, these tests will be performed in tensile mode in a thermomechanical analyzer (TMA).


TACK– Tack is described as a measure of how quickly an adhesive bond is formed when two surfaces are brought together with light pressure. The faster two surfaces bond, the higher the tack. On the contrary, lower tack allows an adhesive film or tape to be repositioned.


TENSILE STRENGTH – Tensile strength, maximum load that a material can support without fracture when being stretched, divided by the original cross-sectional area of the material. … When stresses less than the tensile strength are removed, a material returns either completely or partially to its original shape and size.

  1. Capable of tension : ductile.
  2. Of, relating to, or involving tension tensile stress.


TERPOLYMER– When there are three chemically different repeating units, the resulting polymer is termed a terpolymer. Commercially, the most important copolymers are derived from vinyl monomers such as styrene, ethylene, acrylonitrile, and vinyl chloride.

A diblock copolymer is a polymer consisting of two types of monomers, A and B. The monomers are arranged such that there is a chain of each monomer, and those two chains are grafted together to form a single copolymer chain. … Below a certain transition temperature the polymer melt orders.

Butadiene is the only monomer. You guessed it – if there is another conjoined monomer ( not a mechanical blend ), you got a COpolymer. … And a TERpolymer is three monomers.


THERMOPLASTIC- Temperature Considerations in Plastic Thermoforming Material Selection. … The plastic begins to soften and lose its stiffness as the material temperature increases and if you heat it long enough or exceed the limit of its operational temperature range, it will begin to distort.

Particular grades of PPS can be used in injection and compression molding at temperatures (300 to 370 °C) at which PPS particles soften and undergo apparent crosslinking.


THERMOSETTING– A thermosetting polymer, often called a thermoset, is a polymer that is obtained from irreversibly hardening by curing from a soft solid or viscous liquid prepolymer (resin). Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. Bakelite is a thermosetting plastic.


TOLERANCE– The tolerance is the difference between the maximum and minimum limits.” This can be shown as upper and lower limits (0.2500over0. 2498) or an allowable amount above and below a nominal dimension (0.2500+0.0000over−0.0002, 0.2499 ±0.0001). Both of these methods define the same range of allowable dimensions.

A tolerance is an acceptable amount of dimensional variation that will still allow an object to function correctly. Three basic tolerances that occur most often on working drawings are: limit dimensions, unilateral, and bilateral tolerances.


TORSILASTIC SPRING– Paper deals with one system of designing rubber springs; outlines its advantages; indicates its limitations; and describes the approach to the problem. This spring is of the torsion type, called “Torsilastic,” and is claimed to present advantages not only in its characteristics as a spring but also in flexibility of application which makes it possible to meet a wide range of requirements by variations in spring design and in the length of the moment arm which applies the torsional load. In general, it consists of an inner shaft surrounded by an annular layer of rubber bonded to the inner shaft and also to an outer metal shell. The outer shell is split into two segments. The spring is stressed in torsion by anchoring either the shaft or outside shell to the chassis and rotating the other member.


TRANSFER MOLDING– Applications. Transfer moulding is a leading manufacturing process for encasing electronic components with rubber or plastic. Inserts, like metal prongs, semiconductor chips or ceramics can be placed within the mould before the material is injected, allowing it to “float” within the material as it cures.

Transfer moulding is a leading manufacturing process for encasing electronic components with rubber or plastic. Inserts, like metal prongs, semiconductor chips or ceramics can be placed within the mould before the material is injected, allowing it to “float” within the material as it cures.

Since the design and mould tends to be complex, tooling can also become expensive. 2). Waste material. Transfer pots typically produce higher volume waste than traditional overflows in compression tools.


TRAPPED AIR– The air that is enclosed in a product or between a mould surface and a product during vulcanization.


TUMBLING – A finishing process for removing flash from a moulded part by placing in a rotating barrel with or without the added finishing material such as shells, dry ice, etc.


Tailgate – A subsidiary gate road to a conveyor face as opposed to a main gate. The tailgate commonly acts as the return airway and supplies road to the face.


Tailpiece – Also known as foot section pulley. The pulley or roller in the tail or foot section of a belt conveyor around which the belt runs.


Tail section – A term used in both belt and chain conveyor work to designate that portion of the conveyor at the extreme opposite end from the delivery point. In either type of conveyor it consists of a frame and either a sprocket or a drum on which the chain or belt travels, plus such other devices as may be required for adjusting belt or chain tension.


Tension – The act of stretching.


Tertiary – Lateral or panel openings (e.g., ramp, crosscut).


Through-steel – A system of dust collection from rock or roof drilling. The drill steel is hollow, and a vacuum is applied at the base, pulling the dust through the steel and into a receptacle on the machine.


Timber – A collective term for underground wooden supports.


Timbering – The setting of timber supports in mine workings or shafts for protection against falls from roof, face, or rib.


Timber set – A timber frame to support the roof, sides, and sometimes the floor of mine roadways or shafts.


Tipple – Originally the place where the mine cars were tipped and emptied of their coal, and still used in that same sense, although now more generally applied to the surface structures of a mine, including the preparation plant and loading tracks.


Ton – A short or net ton is equal to 2,000 pounds; a long or British ton is 2,240 pounds; a metric ton is approximately 2,205 pounds.


Top – A mine roof; same as “back.”


Torque wrench – A wrench that indicates, as on a dial, the amount of torque (in units of foot-pounds) exerted in tightening a roof bolt.


Trackman – A workman who keeps mine tracks in repair.


Tractor – A battery-operated piece of equipment that pulls trailers, skids, or personnel carriers. Also used for supplies.


Tram – Used in connection with moving self-propelled mining equipment. A tramming motor may refer to an electric locomotive used for hauling loaded trips or it may refer to the motor in a cutting machine that supplies the power for moving or tramming the machine.


Trapper – Trapper boy, a boy stationed at an underground door, to open and close it when boxes pass, and thus control the air current.


Transfer – A vertical or inclined connection between two or more levels and used as an ore pass.


Transfer point – Location in the materials handling system, either haulage or hoisting, where bulk material is transferred between conveyances.


Travelling Way – A passageway for men and horses in and out of the mine.


Trip – A train of mine cars.


Troughing idlers – The idlers, located on the upper framework of a belt conveyor, which support the loaded belt. They are so mounted that the loaded belt forms a trough in the direction of travel, which reduces spillage and increases the carrying capacity of a belt for a given width.


Tunnel – The passageway between two mines or systems of working, driven horizontally across the measures.


Tunnel – A horizontal, or near-horizontal, underground passage, entry, or haulageway, that is open to the surface at both ends. A tunnel (as opposed to an adit) must pass completely through a hill or mountain.

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