Gooding Aluminium Products | Glossary | Aluminium Products

Glossary

A

Acute angle: A two-sided section with equal or unequal legs joining at less than 90° to each other.

Ageing: The hardening process which either takes place naturally at room temperature over a period of time, or by heating for a much shorter period at a relatively low temperature (known as artificial ageing).

Annealing: A thermal treatment for softening aluminium.

Anodising: The electrolytic process which thickens the natural oxide film on the surface of aluminium. The finish results in enhanceddurability, weather resistance and appearance.

Anodised natural finish: A matt silver finish (without the addition of coloured pigments).

Anodised silver finish: A different description of the above finish.

Architectural quality: A grade suitable for the anodising process.

B

Base thickness: The thickness of a tread grip plate not including the lozenge height.

Blank: A sheared to size piece of metal.

Billet: The short slug of aluminium used in the extrusion process.

Box section: A square section with a square hollow centre.

Buffing: A mechanical finishing operation carried out with fine abrasives to produce a lustrous effect.

Busbar: A metal / grade with excellent electrical conductivity properties.

Burr: The thin ridge or area of roughness left by a metal shearing operation.

Butt strap: Used to join two end pieces of metal together.

C

C or U section: A three sided channel with legs or upstands at 90° to baseline.

Carrier bar: Usually a section of angle or flat bar rear fitted to and joining together a number of horizontal profiles eg louvre blades.

Chair section: A small ‘h’ shaped profile.

Chamfer: An angled edge.

Chemical brightening: A treatment to improve surface reflectance.

Chequer pattern: Describes a sheet / plate with an upraised lozenge pattern on one side, resulting in a non-slip surface.

Chromating: Chemical conversion process which acts as a surface pretreatment for improved corrosion resistance and paint adherence.

Clean: The mechanical removal of an upraised weld-bead.

Coil anodising: Coiled material is unrolled and passed through the anodising plant in one operation, chieving close control of surface shade and finish.

Cold working: Altering the metal shape or dimensions at atmospheric temperature.

Corner protectors: Normally a 90° right-angle section fixed to exposed wall corners for added protection

Corrosion: The combination of metal with corrosive agents and the subsequent wasting away of the metal.

Corrugated: Profiled sheet formed to numerous ribbed and curved designs.

Crazing: The surface condition arising from forming pre-anodised material.

Crimp: To fold and pinch two pieces of metal together in making corners.

D

Deburr: The removal of sharp or irregular edges.

Dead lengths: Exact lengths within established tolerances.

Die: A round steel plate containing a cut out of the required profile shape, which the aluminium is forced through.

Die line: A longitudinal depression or protrusion formed on the surface of extruded sections. Die lines are visible to a degree on all extrusions and are caused by a wearing of the die bearing.

Dimensions: The measurements of any aluminium item are always taken to be the overall or outside dimensions unless otherwise stated.

Dowel: Solid round bar or pin cut to the required length.

Ductility: The property of metal which allows it to be deformed cold without fracture.

Duralumin or Dural: Generic terms used to describe medium strength aluminium alloy.

Durbar: A trade name for aluminium treadplate.

E

Edge: The side of an item

Edge – sheared: The edge produced by the cold shearing of metal between two moving blades or between one moving blade and fixed edge.

Edgewise bow: The bow in sheet or strip which often occurs, to a lesser or greater degree, after shearing, usually measured in terms of offset from a straight edge.

Electrolytic polishing: Polishing effected by immersing the object to be polished in a suitable tank while an electric current is passed between the object and a cathode. The object to be processed is the anode and is polished by loss of its surface atoms.

End: The edge of the longest dimension.

Etching: The production of a matt finish by chemical (acid or alkali) treatment.

Expanded: Incised sheet material which is stretched into diamond or elongated shapes.

Ex-stock: From stock with immediate availability.

Extrusion – direct process: At high pressure an aluminium billet is pushed through a die with an aperture of the required shape (the majority of sections are extruded this way).

Extrusion – indirect process: At high pressure an aluminium billet is pulled through a die with an aperture,  of the required shape (miniature and intricate items are produced by this method).

F

Fabrication: The process of manufacturing to detailed requirement.

Face: The front surface of an item.

Finger plate: Usually a rectangular piece of flat sheet, screwed or bonded around the handle area of a door.

Fishplate: A flat piece of metal butt-joining one Iength to another.

Fishtail: A flat piece of metal splayed and slit at one end to facilitate keying into brickwork / concrete, etc.

Flange: Projecting upstand/s or leg/s on a section of profile.

Flashings: Normally factory-formed pressings to desired size and shape requirements for use as weatherproofing material on parapets, etc.

Form: An item produced by bending sheet material to the required shape, resulting in radiused or curved corners.

G

Gap: The inside dimension between two parallel flanges.

Girth: The overall width of an item.

Grain flow: Elongation of the grain structure in the direction of working.

H

H section: Identical in shape to a capital ‘H’ but with varying distances between the outside flanges to accommodate different board or glass thicknesses.

Heat treatment: An operation or combination of operations involving the heating and cooling of the metal for the purpose of obtaining certain desirable mechanical properties

I

Ingot: The original form into which aluminium is cast for subsequent rolling or extruding.

J

Jay: Similar to an odd leg channel but with the baseline curving from the back leg to the front leg.

K

Kicking plate: Usually a rectangular piece of flat metal screwed or bonded to the full width of a door at floor level.

L

L shape: A two sided section with equal or unequal flanges joining at 90° to each other.

Leg: Protruding flange or rib of section.

Louvre vents: a) One-piece formed louvre, each louvre pushed out by a press tool.
b) Profile blades attached to surround frame or rear carrier bars.

M

Mill: Sheet or extrusion plant.

Mill finish: Raw aluminium, as it comes from the mill. Surface can vary from a dull to semi-bright appearance.

Moulding: Trim profiles produced in a malleable condition, suitable for cold forming.

N

Notch: A ‘cut out’ or ‘cut back’ from one end or edge

O

Obtuse angle: A two-sided section with equal or unequal legs joining at more than 90° to each other.

Oddleg channel: Three sided aluminium section with one leg longer than the other but both joining the baseline at 90°.

Ovality: The departure of the cross section of a round tube or bar from a true circle.

Over pattern / over pattern thickness: Describes the overall thickness of a treadplate, including the lozenge height.

P

Part tool / die cost: Custom-made extrusions require a contribution towards tool / die production costs.

Patterned: A sheet product with a pattern, usually on one side, for decorative purposes.

Perforated: Sheet material with punched holes.

Plate: Rolled product with a thickness of more than 4.7mm.

Pitting corrosion: Pitting corrosion is a localized condition on the metal surface, caused by reaction with atmospheric contaminants.

Polishing: The application by mechanical means of a grained or smooth surface.

Pop-rivetting: A mechanical means of joining from one side only, two pieces of metal.

Profile: The end / sectional view of an item.

Polythene / plastic film: A thin, peelable protective film, applied to sheet material before processing commences.

Q

Quenching: Rapid cooling of metal by immersion in oil, water or another medium.

R

Radius: A corner or edge with a rounded face.

Random lengths: Varying overall profile length.

Rip-saw: The cutting process which reduces or removes flange dimensions.

Rivet: A short metal pin for fastening two pieces of metal together, having a head at one end with the other end being hammered flat after location.

Rolling: Sheets or sections passed through a series of rollers to produce the desired shape.

S

SAA (satin anodised aluminium): Natural anodised aluminium.

Sealing: A treatment applied subsequent to anodising reducing the surface porosity.

Shate: Rolled products with a thickness of more than 3.2mm but no greater than 4.7mm.

Sheet: A rolled product with a thickness up to and including 3.2mm.

Sizes: All standard product dimensions are subject to the appropriate international tolerance standards.

Slab: A semi-finished aluminium product, approximately rectangular in shape, from which flat rolled items such as sheets, plates, etc, are produced.

Slitting: Cutting a strip into a number of narrower strips by means of rotary cutters.

Slug: The piece of material removed by the punching / perforating process.

Strain hardening / work hardening: Modification of metal structure by working at room temperature, resulting in an increase in strength / hardness, with a reduction in ductility.

Solution heat-treatment: Heating at a prescribed temperature for a given period of time, followed by a rapid cooling or quenching.

Split-batten: A narrow offset or jay type profile used for ‘invisibly’ hanging wall panels and boards.

Straightening: Correction of shape distortion by mechanical means.

Strip: a) Sheet material sheared to narrow width.
b) An extruded flat bar.

Surface bloom: Aluminium surface discolouration, that can occur after prolonged exposure to moist air conditions or during heat treatment processes.

T

Table: The top plain surface.

Temper designation: The amount of work hardening or rolling an item has received.

Tolerance: The allowable deviation from a given dimension.

Top hat: A three sided channel section with extra flanges joining and facing outwards at 90° to each leg or upstand.

Tube: A circular section with a hollow centre.

W

Water bar: Flat strip or bar.

Wallboard section: Profiles designed to accept wall panels of varying thicknesses.

Water stains: Surface oxidization, usually caused when moisture is present between closely stacked metal surfaces.

Web: The central part of a section that joins two flanges together.

Weld bead: The narrow moulding resulting from the welding process.

Wrought product: Items produced from the extrusion and sheet production processes. HTS

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