Polishing windows car
Cars of glass should be smooth and transparent. But during a certain moment on them there are microscratches. If the formed damages are not so deep, it is possible to return transparency of glass. Motorists often face discrepancy of wear of a surface of glasses of the car which responsible is ordinary sand. Getting between a working edge of an elastic band of "yard keepers" and sealants of door lowered glasses, sand works as an abrasive, promoting emergence of scratches. To put scratch it is possible and wiping glasses a dry rag. Formation of shortcomings depends on speed: the quicker the car moves, the sand is more effective does the dirty work. Cases when after run in 1500-2000 km with speed of 200-220 km/h, the windshield of new foreign cars appeared so speckled by scratches that achieved replacement are known.
With microdamages of sites of a windshield during daylight hours it is possible to be reconciled. But, at night light of headlights of counter cars turns glass, issechenny sand or with rubbed clean "arches" from "yard keepers", into a source of the flares worsening visibility.
Because of difficulties of processing of glass its defects give in to partial removal. Elimination of superficial damages of glass becomes polishing and polishing, with application of sheet abrasive materials (a fine-grained emery paper), polishing circles of various forms and the sizes, polishing pastes on the basis of oxides of rare-earth parts, also diamond pastes. The restoration method, the suitable tool and abrasivity of materials choose is dependent on type of glass, a place and a type of damage, its size and depth of microroughnesses.
Widespread way of elimination of insignificant superficial damages of glass – its polishing after which the processed site of glass becomes very transparent. When polishing the very narrow layer of glass – in units of microns is removed. For this purpose use an abrasive in the form of pastes of malekhanky granularity.
Small sites of attritions from "yard keepers" on windshields and superficial scratches are polished with felt "fungus" with the put diamond paste. But to get rid at all this it is possible only from dullness of the rubbed clean sites. Depth of 200-300 microns it is better to fill in scratches with photopolymer as to clean them polishing it is impossible. In both cases (polishing or filling by photopolymer) damage is eliminated for 70-80 %. For alignment of the damaged sites of a surface and removal of scratches by depth of 50-300 microns glass grind. Process of polishing of glass means its following polishing. On glass it is possible to grind and polish microscratches manually. If a repair zone big, for work electric grinding cars are used.
Polishing of glass becomes with introduction of an emery paper of No. No. 200-800, abrasive pastes on the basis of carbides and nitrides of pine forest, also diamond pastes: grinding and intermediate. The thicker layer of glass is subject to removal, the granularity of applied abrasive materials is larger. Process of polishing of glass it is dependent on the amount of damage it is labour-consuming and selects from 2 to 5 hours. Polishing thick avtoindent.ru a layer of glass do in 2-3 steps, with gradual reduction of granularity of applied paste. Not to allow marriage, polishing do carefully. Introduction of the electrotool simplifies work, but asks also certain possibilities: the grinding machine is necessary for pressing to glass with a certain constant effort, on another from an overheat it can burst. If effort sharply to weaken, there will be a circle vibration шлифмашины, and it can damage a processed surface.
It should be noted that to polishing gives in though what autoglass, and polishing only the glasses allowing removal of a thick blanket – usually it glasses of headlights. Polishing traces move away from smudges and drops from iron and concrete roofs of garages. Such moisture usually contains salts and weak acids and forms on spot glasses, to get rid from which in the course of a usual sink is almost unreal.
Without considering mechanical ways of restoration of transparency of glasses, exists chemical, with application of the reactants containing fluoric acid. But it yields only temporary result: in 1,5-2 months the glass which has undergone such processing, turns yellow. For this reason chemical polishing now do not use.
Return transparency of a windshield can to be means of polishing – uniform removal of a very narrow layer of the "whipped" glass. Windshields do not grind. On big sites of a windshield it is possible to remove only a very narrow layer – till 10-20 a micron. More rough intervention leads to violation of parallelism of surfaces of the "triplex", finally being formed "sinuosity" turns glass into a lens. To go with it not only it is unpleasant, well and it is dangerous. Arising refractions prevent the driver to look after a road situation and at long trips eyes get tired, and it can lead over time to sight deterioration. To Kalenye (lateral) glasses of cars also are not subject to polishing – though what violation of superficial structure leads to their destruction. Such glasses allow only cosmetic polishing for partial removal of attritions from glass sealants.
To repair glasses of headlights it is simpler. Glass in width of 5-7 mm allows removal more the deepest (50-300 microns) shortcomings, and refractions brought at all this practically do not influence a light stream. It is possible to return the glass damaged by welding by blanket grinding on suitable depth then it is necessary to polish it. If the plastic headlight suffered from welding or "sheaf" of hot sparks when cutting metal by "Bulgarian", in its cap there is a korotkosrochny heating more the deepest layers. Finally there dairy "flakes" and glass actually are formed loses transparency. To get rid of "fog" it is possible, having removed a plastic layer in width of 0,5-1,5 mm, but this operation asks time and is not always possible. For polishing of plastic headlights diamond paste on glyceric base is used. Tooth-powder application gives good results also. These materials put on a napkin from soft skin (husky), allow to execute final polishing of a surface.
Polishing flew down – process long and labour-consuming. Because of difficulties in glass processing its defects give in to only partial elimination. For this reason many specialists refuse polishing, including it time waste. After all, in many cases polishing is profitable, as is the only way of elimination of malekhanky shortcomings of glasses (in particular expensive foreign cars) and allows to avoid their immediate replacement.