Plastics density

Fig. 6-18a Comparison of specific strength vs. specific modulus of RPs. Specific properties are normalized by plastics density (Pa or N/m3 divided by kg/m3).

Plastic shrinkage is dependent on many factors, such as plastic density, stock temper-... 

Bruzan, R., and D. Baker. 1993. Plastic density determination by titration. Journal of Chemical Education 70 397-98. 

Plastic (density) Filler Content of the filler, (% w/w) Specific gravity of the filled plastic, calculated (g/cm3)... 

W adsorption capacity per unit weight of carbon p plasticizer density... 

PRC. Post-Consumer Plastics Densities, Weights and Sizes. Plastics Recycling Compendium Information Resource No. 111/A. 1990a. 

Calcium silicate, natural n. CaSiOs. It has white color and acicular particles. It is characterized by high flatting action, combined with low oil absorption, and is used as an extender in paints, ceramics and plastics. Density, 2.9g/cm (24.2lb/gal) O.A., 25—30 particle size, 7 pm (fine particle grade) hardness (moh), 4.5. Syn wollastonite and calcium metasilicate. 

General requirement for clay liners The permeability of a re-molded clay is influenced by a number of factors, the key ones being plasticity, density, moisture content during compaction and method of compaction. Although the detailed requirements for compacted clay liners (CCLs) vary, the following parameters usually apply ... 

In crystalline plastics, density has a direct effect on properties such as stiffness and permeability to gases and liquids. Changes in density may also affect other mechanical properties. 

Foamed plastic Practically all plastics can be made into foams. When compared to solid plastics, density reduction can go from near solid to almost a weightless plastic material. There are so called plastic structural foams (SFs) that have up to 40 to 50% density reduction. The actual density reduction obtained will depend on the products thickness, the product shape, and the melt flow distance during processing such as how much plastic occupies the mold cavity. 

One cmrent rule is the depth of the pocket is determined by multiple factors. These factors are plastic density, weight of part and parison, parison diameter, parison orientation, and pre-blow pressme. When the flash pocket is shallow, it causes extreme pressme at the parting line and machine pressure section and it causes difficulties in trimming off the flash. When the flash pocket is deep, it causes poor cooling. The poor cooling can cause a hot flash which softens and weakens the weld line [1]. 

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