Filler organic filler

Inorganic materials such as chalk, flour, china, clay, mica, barytes. Fuller s earth, Aerosil (finely divided Si02), asbestos, glass-fiber, and metal or oxide single crystals (whiskers) are all used as fillers. Organic fillers include wood flour, cellulose flakes, foam-rubber chips, paper cuttings. 

Organic Filler - Organic fillers are made from natural or synthetic organic materials. Natural material derived organic fillers include wood and shell flours. Synthetic material derived fillers include fluoropolymer spheres and milled polymer waste. Organic fillers are characterized by relatively low cost and low density. They might increase the flammability and decrease the moisture resistance of plastics. See also Mineral Filler. 

In addition to the inorganic fillers, organic fillers such as high molecular weight styrenes, lignins and reclaimed rubber may be used. 

Another commonly employed low-cost organic filler is coconut shell flour. This can be incorporated into the moulding composition in large quantities and this results in cheaper mixes than when woodflour is used. The mouldings also have a good finish. However, coconut shell flour-filled mouldings have poor mechanical properties and hence the filler is generally used in conjunction with woodflour. 

Asbestos may be used for improved heat and chemical resistance and silica, mica and china clay for low water absorption grades. Iron-free mica powder is particularly useful where the best possible electrical insulation characteristics are required but because of the poor adhesion of resin to the mica it is usually used in conjunction with a fibrous material such as asbestos. Organic fillers are commonly used in a weight ratio of 1 1 with the resin and mineral fillers in the ratio 1.5 1. 

Organic fibers, synthetic, 24 614 Organic fillers, 11 302t Organic film... 

The filler type has some effect on the fire resistance of the syntactic material. Using carbon microspheres instead of organic fillers makes the foam less combustible39>. The carbonized materials are completely incombustible 113). 

Filler Organic functionality Treated filler Supplier... 

IIIB very poor 100 CTI < 175 Phenoplast (with organic fillers, e.g. wood, textile fibres, cellulose)... 

From the literature analyses we see that organic fillers have thermal expansion coefficients (TEC) values close to those of thermoplasts [7], they have low abrasiveness, their density is similar to that of thermoplasts [6, 8] but as a rule, their grindig is difficult [9], they are combustible and explosive, not thermostable and not always cheap [9]. Mineral fillers are comparatively easy to grind, their cost is low, they are thermostable and non-combustible, but their TEC s are an order lower than those of thermoplasts. As a rule, their density 2-3 times higher than the thermoplasts [6]. Their abrasiveness is too high. 

Mineralorganic fillers can be produced by mixing mineral fillers, like ash from heating and power plants, chalk, glass spheres, etc., with organic fillers such as saw-dust, ground nut shells, starch, etc. These immense possibilities have not been exploited yet. 

In preparing compositions use is made of organic and mineral fillers. The most important organic filler is bleached wood pulp. The pulp fiber length depends on the type of wood thus, pulp produced from beech has 1 mm-long fibers, whilst that obtained from conifers -3 mm-long fibers. 

Fig. 1 Total ion chromatogram (TIC) from the GC/MS analysis of commercial Abietic Acid dissolved in an organic solvent. Abietic Acid is an organic filler material used in the compounding of certain types of rubber. The chromatogram clearly shows that this organic additive contains many individual chemical entities.

Furan Mortars Furans have the broadest range of resistance to both acid and alkali (pH 0-14) and temperatures of all the resin mortars. Furan mortars can accept temperatures up to 350°-360°F. Modified furans are available that can withstand continuous temperatures of up to 425°F and intermittent temperatures to 475°F. Unlike the other mortar materials, furans have excellent resistance to strong alkalies as well as non-oxidizing acids and many organic chemicals. However, furan mortars are attacked by some organic solvents such as aniline. Furans are available with silica, carbon or barytes fillers, the filler choice depending upon the environmental conditions. 

A similar analysis of functional groups in organic fillers is not feasible. These materials may be very complex mixtures (natural products) differing in chemical composition and surface organization or very diverse (man-made organic fillers). 

Figure 1. Physical and mechanical properties PCM on basis of sevilen. Content of organic filler, weight in % 1-0 % 2 - 20 % 3-40 % 4-50 % 5-60 %. Speed of monoaxial deformation is 100 mm /...

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