If black tar is adhering to the vinyl it is almost a 100 asbestos containing fiber product.
Identify asbestos vinyl sheet flooring pictures.
Unfortunately vinyl sheet flooring manufactured with an asbestos backing poses a serious exposure risk when it is disturbed.
This article describes sheet flooring products known to contain significant levels of asbestos.
Possible signs of asbestos mastic include discoloration and an oily texture.
But before about 1978 in products that looked like this same material asbestos fibers were used as a strengthen material on vinyl sheet flooring backing.
A vinyl sheet flooring that looks like the above has a high chance of asbestos.
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Always test for asbestos fibers before removing any older vinyl sheeting.
Asbestos containing sheet flooring or resilient flooring product identification.
We describe sources of asbestos in older forms of sheet flooring including felt backed flooring rubber backed flooring and vinyl cushion backed resilient flooring products.
Details for identifying asbestos or asbestos suspect sheet flooring products are at resilient sheet flooring id guide.
If your building was built before 1980 mastic mixed with asbestos may have been used to seal your tiles to the floor.