INSECTICIDES AND REPELLENTS 7 



Grams per 100 grams 



„ , of solution 

 Solvent 



Data by Slade (IS): At 20° c. 



Acetone 43. 5 



Benzene 28. 9 



Carbon tetrachloride 6. 7 



Cyclohexanone 36. 7 



Diesel oil _ 4. 1 



Ethyl alcohol 6. 4 



Ethylene dichloride 38. 9 



Odorless distillate (b. p. 198°-257° C.) 2. 



Paraffin (kerosene) (b. p. 138°-2l2° C.) 3. 2 



Tetrachloroethvlene 7. 4 



Toluene ___ 27.6 



Xylene ------ 24.7 



Data by the Velsicol Corporation for lindane: At 25° C. 



AR-50_ __ 21.3 



AR-50G 18. 4 



AR-60 _■ 21. 



Considerable work has been done at the Orlando laboratory on the 

 selection of solvents for emulsifiable concentrates. Of the materials 

 having a minimum flash point of 135° F., isophorone was the only one 

 that would dissolve and hold more than 20 percent of lindane at low 

 temperatures (25-29 percent at 0°). The solvents that were satis- 

 factory for 20-percent solutions at room temperatures (80°-85°) but 

 not at 23° were Solvesso No. 150; Velsicol AR-50, AR-50G, and 

 AR-60; and S/V Sovacide 544-B, 544- C, and 544-F. At 0° lindane 

 was soluble up to 10 percent in S/V Sovacide 544-B and Velsicol 

 AR-50 and AR-60. 



In tests with BHC containing 39 percent of gamma, Velsicol AR-60 

 dissolved 25 percent, isophorone 50 percent, and an 85:15 mixture of 

 the two 40 percent at room temperature. In further tests with this 

 material and lindane in mixtures of fuel oil and S/V Sovacide 544-C at 

 room temperatures the following approximate solubility data were 

 obtained : 



Grams per 100 ml. 

 of solution 



Percent of S/V Sovacide 544~C in fuel oil 



_" 



10 



15 



20 



25 



30 



For aerial applications for the control of mosquitoes, xylene was 

 also a satisfactory auxiliary solvent. It was either mixed with the 

 fuel oil or used to prepare a 20- to 25-percent concentrate for dilution 

 with fuel oil. 



-55- 





BHC 



Lin- 



(39% 



dane 



gamma) 



2. 5 



7. 2 



4. 5 



9. 7 



5.0 



10. 



5. 5 



10. 2 



5. 7 



11.2 



6.2 



11. 5 



