West Midlands Fire Service had initially sent six engines to the fire at around 9.10pm on Friday.
A further two engines had to be sent to the recycling plant in Brandon Way, to help tackle the fire.
Recycling material and oil were reported to be on fire at the site.
Station commander Lee Baker tweeted: "Fire at waste recycling plant in Brandon Way, West Bromwich, eight pumps and hydraulic platform in attendance.
"West Midlands Fire crews working hard to contain the fire and protect business."
By 3am on Saturday morning four crews were still in attendance.
Then, by 9am station commander Baker confirmed there were two pumps still at the site.
He said: "There are still two pumps in attendance. The damage to the building is due to assessed today.
"It was contained within one large open sided metal structure."
West Bromwich fire station crew commander Scott Weldon added: "The two crews in attendance are damping down the site.
"A lot of recycling waste is in the building, we will be there for most of Saturday to dampen down the site."