As noted in the threads 25362 has referenced, be sure to look at NFPA 69, Standard on Explosion Prevention Systems. They have listings of LOC for a number of chemicals but unfortunately I did not see cyclohexane and acrylic acid.
I would point out that LOC is affected by the material used as a diluent. For example, according to NFPA 69 the LOC for propane is 11.5% for a N2/air environment, the LOC for propane is 14.5% for a CO2/air environment.