I've been searching for some time on finding a manual onm food grade maintenance (not the sanitation) more specifically materials such as gaskets etc that can be used in a food grade facility my industry specifications is the pork industry. I've found tons of white papers on the subject but no one manual we obviously know about food grade lubricants some of the metals allowed and teflon gaskets but I recall there being several alternatives to teflon but cannot find a listing of those materails.