Properties of Won Chang Corp GRP Cable Tray

The data in this section presents the minimum ultimate values from testing in conformance to ASTM procedures. These values are obtained from coupons machined from WonChang Corp GRP shapes and function as a proof test for the WonChang Corp composite. WonChang Corporation verifies the full section bending Modulus of Elasticity using a simple beam concept at the start of each production run and periodically thereafter. The designer must consider environmental factors in designing for the actual application. These factors include elevated temperature and corrosive materials.

GRP Cable Tray Temperature Effects

The approximate retention of mechanical properties at elevated temperatures are:

FRP Cable Tray Corrosion Effects

As a general rule, the isophthalic polyester resin is resistant to most acidic attacks while the vinyl ester resin is resistant to acids and bases. The effect of corrosive chemicals is temperature dependent with elevated temperature increasing the corrosion activity. Won Chang GRP cable tray incorporates a synthetic veil on the surface of all structural shapes which causes a resin rich layer which enhances corrosion protection.

GRP Cable Tray UV ( Ultraviolet Radiation) Effects

UV is a sunlight produced environmental attack of FRP composites. The synthetic surfacing veil also aids in protecting the composite from UV degradation, the effect of which is sometimes referred to as “fiber blooming”. WonChang polyester and vinyl ester also contain a UV inhibitor to enhance the protection against sunlight.

 There is a large variation in the degree of fading from UV degradation based on the color selected. While this fading is undesirable, the structural integrity of the composite will remain unaffected as a surfacing veil is utilized. Coating with materials such as UV stabilized polyurethane based paints are very effective in maintaining the color and offer the optimum long-term protection from UV attack.