Technical information on aluminium - Radel

1 652 General information on aluminium enclosuresThe Euromas aluminium enclosures have a tongue andgroove system; they have a neoprene or foam rubber gas-ket that is oil and benzene resistant and provides protec-tion classification IP seals can be inserted for special requirements. These are particularly resistant, to heat and chemicals,or will guarantee greater EMC standard enclosures are made of the AL SI 12 alloy andare the effect of oxygen, aluminium forms a thick, firmlyadhering oxyde layer on its surface. This is highly resistantto corrosion and protects the metal beneath from cases where this natural corrosion protection is not suffi-cient, special surface treatments can give greater protectionagainst corrosion. These include passivating, lacquering, or acombination of passivating and latter isespecially suitable if corrosion-proofing against sea wateris lacquering, an additional priming coat or several final coats of lacquer will give greater powder-coating is carried out, independent ofthe colour chosen, on an electrostatic belt.

2 The coating isthen annealed in a 45-minute process at a temperature ofabout 120 C. This gives a permanent, hard surface whichwill not rub standard powder-coating processes are:a) Degreasingb) Powder-coatingDepth of layer up to > 50 mBase: polyester amino-resinPigment: lead, free of chromateSurface: structured, free of siliconeOur standard lacquering has shown a good resistance tochemicals: mineral oils, petrols, drilling emulsions, cleaningfluids, weak acids and lyes, weak solvents and request, we can of course also use other lacquers orprocesses. A different surface structure or gloss can also principle, it must be taken into consideration that the various aluminium casting processes result in different surface qualities. While diecasting gives a smooth, evensurface, chill casting results in a slightly grainy surface.

3 Thisaffects special requirements regarding surface quality, screenprinting, engraving, advice for machining aluminium enclosuresPlease make sure that all remnants of any coolants or lubri-cants used in machining are removed if plastic parts are tobe attached to aluminium enclosures ( plastic cableglands, adapters, plugs, etc.). Coolants and lubricants cancause plastic parts to become brittle and split. Moreover, itshould be remembered that when aluminium castings aremachined, enclosed air bubbles, known as shrinkage holes,can be casting process and alloys we use result in very fewshrinkage for machining aluminium panelsFor reasons of design and stability, we offer aluminiumfront panels for many of our plastic enclosures. These aluminium front panels are cut of anodised plate material,so the surfaces have an anodised layer, but not the cut remember that screenprinting or tampon printingon the anodised layer may not always adhere properly.

4 Ifwe are machining and imprinting front panels to customerspecifications we use aluminium plate material which, depending on the requirements, is only anodised after advantage of this is:All the edges are corrosion-proof, and any imprinting willnot rub information on aluminium653 The properties of aluminium alloysGD-AI Si 9 CU 3GD-AL Si 12GK-AL Si 12Al Mg Si (diecasting)(diecasting)(chill casting)(wrought alloy) yielding point N/mm214013080 160 Tensile strengthN/mm2240240170215 Ductile yield%<11612 Brinell hardnessHB806055no inform. availableElectr. resistivitym/ohm mm2no inform. - 2717 - 2728 - 34 Therm. conductivityW/mK110 - 120130 - 160140 - 170190 - 210 Heat resistance C200200200200 Cold resistance C-100-100-100 -100 The resistance of aluminium to chemicalsReactionRemarksAcetic acid+Acetone+Ammonia+Benzene+Benzole+ ofree of H2O = +contain.

5 H2O = oButane+forming gasesCalcium chloride+Carbondisulphide+Chlorine benzole+Citric acid+Drilling oil,cutting oil+Fat, wax+Formaldehyde+free of formic acidFormic acidoGlycerine+ ---contains Na CI = ---Heating oil+Hydrocarbontetrachloride+Hydrogen+Sy mbols:+resistantoresistant under certain conditions---not resistantReactionRemarksLactic acid+Linseed oil+< 250 CLubricating oil+Lubricating soap+Methanol+Methylene chloride +Nitric acid+Oil, natural gas+Petroleum+Potassium chloride oPotassium hydroxide ---Propane+Sodium carbonate oSodium chlorideoSodium hydroxide +free of H2when moltenSulphuric acidoToluol+Trichloroethylene+light metal triWater vapour+Xylol+Zinc sulphateoUnless otherwise stated, the tests were carried out atroom different media coincide, the resistances can we cannot accept any liability for these dim.

6 AreaSpatialDegree ofShapeoveroverdiagonalexactitudedepen-3 6area 1)dencyup to up to up to3610up to 180 GTA 13over 50 GTA 13/5up to 500over 180 GTA 14over 500 GTA 14/5 Table 1. Tolerances of dimensions not related to the shape, lengthwise dimensions (lengths, widths, heights, central distances, diameters, roundings)Nominal dimension areaSpatialDegree ofShapeover over over over over over over over over over over over overdiagonalexactitudedepen-183050801201 80250315400500630800 1000area 1)dencyup to up to up to up to up to up to up to up to up to up to up to up to up to up to18305080120180250315400500630800 1000 1250up to 180 GTA 13over 50 GTA 13/5up to 500over 180 GTA 14over 500 GTA 14/5 dimensions are those in the same parts ofthe dimensions are those created by the interaction of movable tool components.

7 Wall thick-nesses and base thicknesses or dimensions affected by additives or )Determining the spatial diagonal:The spatial diagonal R is that between the extreme pointsof the is calculated from the nominal dimensions of the prisma-tic body, which delimits the casting, whatever its = l2+ b2+ h2 (spatial diagonal)Table of dimensions not related to the shape for thickness (wall thicknesses, ledges, ribs)Tolerances for pressure diecastings (DIN 1688, Page 4)Important: We accept no liability for quoted standards! Technical information on aluminium655Z-2801996 All dimensions in 800(Hollow profile) Table 3 Tolerances for the wall thicknesses of hollow profilesTolerances for the wall thicknessesRange of a circumscribing circle duover 75 over 130 over 250overup toto 75to 130to 250to 300 23 800(Full profile)Table 2 Tolerances for the wall thicknesses of full profilesRange of foroverup towall thicknesses for aluminium profilesacc.

8 To DIN EN 12020-2 (previously DIN 17615, Part 3) Important: We accept no liability for quoted standards!The tolerances for the nominal dimensions (see table 1) depend on the following ratios: diameter of the minimum circumscribing circle dudivided by the minimum wall thickness sminand maximum wall thickness smaxdivided by the minimum wall thickness 1 Tolerances for linear measuresTolerances for aratio of du: sminRange ofup to 40 : 1over 40 : 1dimensionsand a ratio ofsmax: sminoverup toup to 6 : 1over 6 : 1 10