I have a 6 inch metal lap that is unmarked and would like to hear how I can determine if it is a lead lap (which most people do not use anymore due to environmental reasons) or perhaps a tin lap. It weighs 5.2 lbs
Calculate the volume, figure out weight per cubic centimetre, look up specific gravity for lead and tin.
Go to Home Depot and buy a lead test kit. They are use to test paints, Porceline and other items. Easier and more effective than the math route. It might be mixed metal product.
All of my older laps are aluminum…Rob