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This study deals with the environment and different liquid environments which have effect on both the colour fastness and the mechanical properties – which can be expressed as tensile strength and elongation – of coloured high density polyethylene polymer in net form , used for warning and used as an indicator for the undo ground pipes passage. It was found that withering affects shows that the tensile strength and the elongation considerably, while change on temperature of the surroundings was found to show less effect. Also, environment liquids caused a small loss in tensile strength of about (6%) while the samples in extended percent or about (22%) was observed. Both parameters were showed an appreciable change at damped soiling mud. The light fastness of the examined polymer samples were greatly affected by weathering conditions, while the other factors did not affect the light fastness considerably.

Change of the Physical Properties of Coloured High Density Polyethylene by Effect of Environment