Blowing aids

Whereas there is no universally accepted specification for marketed natural gas, standards addressed in the United States are Hsted in Table 6 (8). In addition to these specifications, the combustion behavior of natural gases is frequently characteri2ed by several parameters that aid in assessing the influence of compositional variations on the performance of a gas burner or burner configuration. The parameters of flash-back and blow-off limits help to define the operational limits of a burner with respect to flow rates. The yeUow-tip index helps to define the conditions under which components of the natural gas do not undergo complete combustion, and the characteristic blue flame of natural gas burners begins to show yellow at the flame tip. These... 

Defoaming and blowing agents Flow promoters Plasticisers Processing aids... 

Additives (antioxidants, antiozonants, softeners, tacfdfiers, peptisers, scorch inhibitors, colorants, flame retardants, blowing agents, process aids, etc.)... 

Whilst sodium bicarbonate is the primary blowing agent, it is common compounding practice to use it in conjunction with a proportion of a weak acid, such as stearic or oleic acid, whose function is to trigger the reaction and assist in the uniform decomposition of the bicarbonate. The higher than normal fatty acid level will also act as a process aid, facilitating the bubble expansion process. 

Blow moulded and sheet thermoformed products for food, personal care, health, medical and lab ware applications, household chemicals and beauty aid products. .. 

The next step is the incorporation of various additives—compounding. Typical additives include fillers, processing aids, activators, age resistors, sulfur, antioxidants, and antiozone compounds, extenders, plasticizers, blowing agents, pigments, and accelerators. 

---