A master batch composition for an article requiring a functional life of approximately twenty-four months, consisting of:
- a. 2 wt % cobalt stearate;
- b. 0.5 wt % pentaerythritol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) as a primary anti-oxidant;
- c. 0.5 wt % tris (2,4-di-tert.-butylphenyl) phosphite, as a secondary anti-oxidant;
- d. 3 wt % polycaprolactone as a bio-assimilation promoting additive;
- e. 3 wt % ethylene vinyl acetate as a bio-assimilation promoting additive;
- f. 91 wt % polypropylene, as a carrier resin;
- and
- the master batch composition having a let down ratio in raw material of 1.5%.