Potentially hazardous bonds

Biological growth can present a potentially hazardous fouling, since it can provide a stickier surface with which to bond other fouling sources. In many cases, however, treatment of the fluid can reduce the amount of biological growth. The use of germicides or poisons to kill bacteria can help. 

Formaldehyde (HCHO) is a colorless gas with a pungent odor. Formaldehyde has found wide industrial usage as a fungicide and germicide, and in disinfectants and embalming fluids. The serious sources of indoor airborne formaldehyde are furnimre, floor underlayment insulation, and environmental tobacco smoke. Urea formaldehyde (UF) is mixed with adhesives to bond veneers, particles, and fibers. It has been identified as a potential hazardous source. 

The checkers used Fisher Scientific basic alumina, Brockman activity I, 80-200 mesh. Neutral alumina and silica gel have also been used. Basic alumina minimizes the potential hazards of hydrolysis or proton-catalyzed isomerization of the carbon-carbon double bond in susceptible enol ethers. Gaseous trimethylamine has also been added to the eluent to minimize these problems during purification. 

Acrolein is soluble in water and in many organic solvents including ethanol, acetone, and ether (Table 1.1). Acrolein is a highly reactive molecule with two reactive centers one at the carbon-carbon double bond, and the other at the aldehydic group. Acrolein is extremely volatile, flammable, and explosive (Table 1.1), especially in sunlight or in the presence of alkali or strong acid. A potential hazard in... 

Safety aspects should partner the measures practised within a quality system, and they represent a vital part of the education and training of the personnel involved. The history of adhesive bonding has shown that accident and health problems associated with the technology are rare. Nevertheless, any material which is used without suitable precautions can become an unreasonable risk to health, safety, property, and the environment. The actual hazard presented by the use of materials depends not only on its potential hazard, but also on the conditions under which it is used. Concentration and duration of exposure to hazardous materials is generally the critical element in determining risk factors. 

---