Flexural Modulus of Materials Versus Profiles

In 2004-2005 AAMA had arranged an independent testing of commercial composite boards provided by six manufacturers. All boards were tested in the same conditions and using the same equipment and the same operator, and data are shown in Table 7.35. 

Eigures in Table 7.35 does not reflect a shape of the composite board, size of pro-hle (solid or hollow), but just the formulation—type and amount of plastic, type and amount of hllers, coupling agents, other additives, and so on. It should be noted here that only one tested board had the lowest both flex strength and flex modulus from the whole series of boards. The strongest board was not the stiffest one, and generally, there was no any correlation between flex strength and modulus of these boards. 

One can see that for upper hve profiles, flex modulus is close to each other, practically within the error margin of the test. Only the last material prohle (E) is the most flexible one, and it is the weakest one (Table 7.35). 

Flexural Modulus for the Same Material but for Different Profiles  

TABLE 7.34 Flexural modulus values for actual composite deck boards (and PTL as a reference), determined using ASTM D 790 

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