Windows frame

Fig. 18. (a) Window frame channel constmction, and (b) extended view of channel. 

The reinforced window frame channel, eg, the large Russian RM channel (109) and the smaller Russian U25B channel (110), is essentially a window frame channel inside a plastic box which serves as the pressure vessel and main stmctural member. It combines some features of both window frame and plastic box constmction. Frames can be segmented, although with some difficulty, for fault power control. This constmction is difficult to disassemble for inspection and/or refurbishment. 

BeryUium is used in the space shuttle orbiter as window frames, umbUical doors, and the navigation base assembly. An important appHcation for beryUium is inertial guidance components for missiles and aircraft. Here the lightweight, high elastic modulus, dimensional stabUity, and the capabUity of being machined to extremely close tolerances are aU important. 

Polystyrene. Polystyrene [9003-53-6] is a thermoplastic prepared by the polymerization of styrene, primarily the suspension or bulk processes. Polystyrene is a linear polymer that is atactic, amorphous, inert to acids and alkahes, but attacked by aromatic solvents and chlorinated hydrocarbons such as dry cleaning fluids. It is clear but yellows and crazes on outdoor exposure when attacked by uv light. It is britde and does not accept plasticizers, though mbber can be compounded with it to raise the impact strength, ie, high impact polystyrene (HIPS). Its principal use in building products is as a foamed plastic (see Eoamed plastics). The foams are used for interior trim, door and window frames, cabinetry, and, in the low density expanded form, for insulation (see Styrene plastics). 

Door and Window Frames and Sashes. The first successflil application of rigid PVC for windows was as a cladding over a wood core to avoid the need for painting and repainting the sash and the exterior of the frame. Since then, extmded profiles of rigid PVC have been developed to allow... 

Two types of localized corrosion are pitting and crevice corrosion. Pitting corrosion occurs on exposed metal surfaces, whereas crevice corrosion occurs within occluded areas on the surfaces of metals such as the areas under rivets or gaskets, or beneath silt or dirt deposits. Crevice corrosion is usually associated with stagnant conditions within the crevices. A common example of pitting corrosion is evident on household storm window frames made from aluminum alloys. 

Slides Covering pipelines with polymeric films cathodic protection of pipelines, ships, etc.. With zinc bracelets use of inert polymers in chemical plant galvanic corrosion in architecture (e.g. A1 window frames held with Cu bolts) weld decay. 

Series major additives Al + 0.5 Mg 0.5 Si Moderate-strength age-hardening alloy anodised extruded sections, e.g. window frames. 

Architectural uses (window frames, etc.). Plasticised to moke artificial leather, hoses, clothing. 

One reason for the success of PVC is its formulation versatility. Products range from rigid piping and window frames to soft flexible foams, with such diverse materials as vinyl leathercloth, flexible sheeting and playballs somewhere in between. 

Stores should be ventilated and sound, e.g. no cracks in floors, no rusty window frames, no water seepages, etc. 

Extrusion, by its nature, is ideally suited to the production of continuous lengths of plastic mouldings with a uniform cross-section. Therefore as well as producing the laces as described in the previous section, the simple operation of a die change can provide a wide range of profiled shapes such as pipes, sheets, rods, curtain track, edging strips, window frames, etc (see Fig. 4.18). 

Codes have brought more efficiency technologies into widespread use in the market (e.g., vinyl window frames, T-8 fluorescent lamps). 

Provide good draft-proofing strip around the door and operable window frames, leaving sufficient fresh air ingress for any combustion appliances. 

The corrosion of painted mild-steel window frames is often troublesome, especially on horizontal members where moisture tends to collect. This effect can be reduced by bevelling the edges with putty before painting, to help drainage. It is preferable, however, to use more resistant materials such as galvanised steel, stainless steel or aluminium for window frames. 

This is the one example in which metal is not the substrate. Corrosion takes on a new meaning the coating here is required to protect the substrate from direct attack by corrosive substances, from water to more powerful household or industrial chemicals, such as grease, alcohols and bleach. We are concerned with the industrial application of thin protective layers to paper (e.g. labels), card (e.g. playing cards) and many wooden articles, including industrially finished doors, window frames and, particularly, furniture. 

Coating materials may be based on short or medium-oil alkyds (e.g. primers for door and window frames) nitrocellulose or thermoplastic acrylics (e.g. lacquers for paper or furniture finishes) amino resin-alkyd coatings, with or without nitrocellulose inclusions, but with a strong acid catalyst to promote low temperature cure (furniture finishes) two-pack polyurethanes (furniture, flat boards) unsaturated polyester resins in styrene with free-radical cure initiated by peroxides (furniture) or unsaturated acrylic oligomers and monomers cured by u.v. radiation or electron beams (coatings for record sleeves paperback covers, knock-down furniture or flush interior doors). 

In architectural work, particular care must be taken to avoid destructive attack of the anodic film by alkaline mortar or cement during erection, and temporary coatings of spirit-soluble waxes, or acetate-butyrate lacquers are frequently applied to window frames and the like to protect against mortar splashes, which in any event should be removed at the earliest possible moment. 

Since much of the wood in common use today for joinery, including external window frames and roof trusses, is redwood, such as Pinus sylvestris, preservative treatment is very necessary. However, whilst it is known that little corrosion of fasteners can take place in dry wood (<15 Vo moisture... 

Plastics can also be combined with other materials such as aluminum, steel, and wood to provide specific properties. Examples include PVC/wood window frames and plastic/ aluminum-foil packaging material. All combinations require that certain aspects of compatibility such as processing temperature and linear coefficient of thermal expansion or contraction exist. 

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