From dust +‎ -able.

• IPA^(key): /ˈdʌstəbəl/

dustable (comparative more dustable, superlative most dustable)

1. Of a pesticide or herbicide: suitable for crop-dusting.
   • 1999, G. T. Brooks, Pesticide Chemistry and Bioscience: The Food-Environment:

     The crop protection product form which perhaps most deserves the descriptor “traditional” is the dustable powder (DP).

2. Capable of being cleaned with a duster.
   • 1958, Howard Nemerov, “Seven Macabre Songs”, in Mirrors and Windows:

     Small animals
     Began to mooch around and climb up this
     Reversionary desk and dustable heirloom.

• sublated