Effect of Density Specific Gravity on Flexural Modulus

Effect of Density (Specific Gravity) on Flexural Modulus 

When WPG materials are manufactured with the same formulation but at a different speed, nsing vented or nonvented extruders, different moisture content of cellulosic filler, and so on, the resulting profiles often have different density (specific gravity). As a rule, the higher the specific gravity, the higher the flexural modulus (Table 7.44). 

Principally, the data are similar in their trend as those for neat polyethylene, shown in Fignre 7.9. 

Flexural strength valnes for the boards shown in Table 7.45 did not vary much, and the change was not consistent (see Table 7.24) however, flexnral modulus trend with density was very clear. 

Effect of Plastic Content on Flexural Modulus of Composite Materials 

---