November 2004 -- The best way to eliminate polypropylene contamination is to avoid all forms of exposure which can contaminate your wool clip. This includes grazing sheep on hay fields where balers have used poly twine.
If you use poly, contamination will result. Therefore, be responsible and follow these rules:
1. Separate belly wool to help restrict contamination to only a portion of the wool clip.
2. Remove twine before grinding feed.
3. Pick up and dispose of poly twine in an environmentally sound manner.
4. Do not use poly twine for repairs.
5. Do not use poly tarps and carpets at or near shearing of wool.
6. Avoid poly feed bags. Pick up old bags, and dispose of them properly.
7. Use only new and approved wool packaging material. Never package wool in poly feed bags or tie wool bags with poly twine.