The Collaborative International Dictionary of English v.0.48:

Buna \Buna\ n. [trademark.]
   a synthetic rubber made by copolymerizing butadiene with
   another substance such as acrylonitrile or styrene.

   Syn: buna-S. [WordNet 1.5]

WordNet (r) 3.0 (2006):

buna
    n 1: made by polymerizing butadiene [syn: buna, buna rubber]

U.S. Gazetteer Places (2000):

Buna, TX -- U.S. Census Designated Place in Texas
   Population (2000):    2269
   Housing Units (2000): 956
   Land area (2000):     5.948625 sq. miles (15.406868 sq. km)
   Water area (2000):    0.008612 sq. miles (0.022306 sq. km)
   Total area (2000):    5.957237 sq. miles (15.429174 sq. km)
   FIPS code:            11236
   Located within:       Texas (TX), FIPS 48
   Location:             30.439390 N, 93.966199 W
   ZIP Codes (1990):     77612
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Buna, TX
    Buna