Woodworking

Silica. SiHca (qv) comes in various forms including quartz [14808-60-7]. It has found wide use as an abrasive in the past, particularly as an inexpensive coated abrasive for woodworking. The term sandpaper is stiU used as a generic term for coated abrasives in many quarters although the use of sand in coated abrasives has been almost entirely elkninated because of the hazard of siHcosis to the user and its inferior grinding properties (especially for metals). 

Coated abrasive products, once limited to sandpaper in woodworking shops, are versatile and efficient industrial tools. Machines ranging from portable Sanders to giant slab conditioners and roU grinders utili2e coated abrasives. Abrasive belt machines now perform many of the operations that were once the exclusive province of grinding wheels. 

Uses. Synthetic resins have taken over a large share of the market for shellac. Unpigmented shellac is used on floors, woodwork, and paneling. 

By far the bulk of amino resins are used in the woodworking industry for the manufacture of chipboard, plywood and as general glues and adhesives. Melamine-formaldehyde is an important component of decorative laminates. The amount of amino resins used for moulding applications is only of the order of 5% of the total. 

Dust can be emitted wherever solids are mined (e.g. in quames), processed (e.g. flour mills, woodworking factories, metal smelting and foundries), or handled/transported in particulate form. Construction and demolition operations also generate dust. 

Wood dust hazards and precautions COSHH and the woodworking mdustnes Glue spreading machines Hardwood dust survey... 

Despite the fact that the two main components of UF-resins are urea and formaldehyde, a broad variety of possible reactions and structures in the resins can be obtained. At the molecular level, the basic characteristics of UF-resins can be explained as follows (1) high reactivity (2) water solubility and dispersibility, which renders the resins ideal for use in the woodworking industry and (3) the reversibility of the aminomethylene link, which also explains the low resistance of the UF-resins against the influence of water and moisture, especially at higher temperatures. This is also one of the reasons for the subsequent formaldehyde emission. 

Polymer. The polymer determines the properties of the hot melt variations are possible in molar mass distribution and in the chemical composition (copolymers). The polymer is the main component and backbone of hot-melt adhesive blend it gives strength, cohesion and mechanical properties (filmability, flexibility). The most common polymers in the woodworking area are EVA and APAO. 

This method has been used for a variety of applications to visuali2e the concentration of different air contaminants in the breathing zone and how it relates to factors like design of local ventilation, etc. lypical situations where it has been used are when the contaminant source is close to or handled by the worker, e.g., welding, painting, and woodworking. 

Operations are similar to woodworking and collector selection involves similar considerations. See Item 13. 

Metalworking Woodworking and light dust Gases and vapors... 

Recently, a synthesis of PE on the waste of the cellulose and woodworking industry has been reported [288]. Good quality structural and cladding materials can be obtained by pressing these compositions, or special grades of paper and cardboard after appropriate processing. 

Internal fltlings snch as cupboards, drawers and shelves must be kept to a minimum. These may be made fiom stainless steel or a laminated plastic, which may be easily cleaned or disinfected bare wood is to be avoided, although painted or otherwise sealed woodwork m be satisfactory. Stainless steel trolleys can be used to transport eqiripmerrt and materials within the clean and aseptic areas but these must remain confined to then-respective units. Equipment should be so designed as to be easily cleaned and sterilized (or disinfected). 

Grattan, D. W. and J. C. McCawley (eds.) (1981), Proc. Int. Council of Museums, Waterlogged Woodworking Group Conf, The International Council of Museums, Ottawa. 

Humans exposed occupationally for 6.5 (0.3-26.3) years vs. reference population Average concentrations of 0.0012-0.18 mg/m3 air for 3-34 years among occupationally exposed workers <0.02->0.1 mg/L urine in occupationally exposed woodworkers... 

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