Albert, I would recommend this; I manage a couple of B2B pages and I've used promoted post in the past. My thought is if you're trying to sell your products to other companies they'll also see your post. Remember a lot of company pages are mamanged by an employee, who can make a buying decision, or at least tell the right person about your product. Plus, if you're new to FaceBook you need to build an audience that can help spread your message.
P.S Follow companies that you want to sell your product too and engage them. "not a sales pitch" If you'd like I can take a look at your page. My email email@example.com.
Thanks for reading.