HF is by far one of the worst (common) chemicals you will come across. If you get any on you it will seep through the skin (with no indication so) and eat the inside. The agrresive available fluoride ion replaces the calcium in your bones (similar to lead). It is very dangerous and deadly. As for replacement, what are you needing these for? Glass disolving/etching (eats the silicone).
FYI ABF is not necesarily as dangerous but can be converted into HF under conditions i cant recall. Be careful with any chemicals and especially be weary of fluoride containing products