Bitumen has no fixed melting point. What it has is a softening point — and the ring and ball apparatus is the only standard method trusted g
If you work in road construction, pavement design, or bituminous material testing, you've encountered the ring and ball apparatus — or you should have. It is the industry-standard instrument for determining the softening point of bitumen, asphalt, coal tar pitch, and other viscoelastic binders.














