§0 BULLETIN 145, IT. S. DBPAETMBNT OP AGRICULTURE. 



Table 6. — -Corrosive action of the preservatives. 



Preserva- 

 tive No. 



Loss in weight of flange 

 steel after immersion in 

 preservative for 4 weeks 

 at 98° C. in ounces per 

 square foot per week. 



1 



o 



3 



4 

 5. 

 6 

 7, 

 8. 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 26 

 21 

 22 

 23 

 24 

 25 

 26 

 27 



Coal-tar creosote 



Coal-tar creosote, Fraction I 



Coal-tar creosote, Fraction II 



Coal-tar creosote, Fraction III 



Coal-tar creosote, Fraction IV 



Coal-tar creosote, Fraction V 



Water-gas-tar creosote, 1.051 



Water-gas-tar creosote, 1.012 .• 



Water-gas- tar creosote, 1.07 



S. P. F. carbolineum 



A venarius carbolineum 



C. A. wood preserver 



Hardwood tar 



Wood tar (Douglas fir) 



Beech wood creosote 



Spirittine : 



Preservol 



Wood creosote oil 



Timberasphalt 



Copperized oil 



Fuel oil 



Kerosene 



Zinc chloride, 2.4 percent 



Zinc sulphate, 4.5 per cent 



Zinc sulphate (by-product), 7-2 per cent 



B . M . preservative , 2 per cent zinc and 1 per cent alum sulphate . 

 Sapwood antiseptic 



Sodium silicate 



Sodium fluoride, 1 per cent 



Cresol calcium 



Less than 0.005. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Between 0.005 and 0.010. 

 Less than 0.005. 

 Between 0.010 and 0.025. 

 Less than 0.005. 

 Between 1 .900 and 2.000. 

 Between 1.200 and 1.300. 

 Between 0.400 and 0.450. 

 Between 0.200 and 0.250. 

 Between 1.100 and 1.200. 

 No tests made. 

 Between 0.050 and 0.100. 

 Less than 0.005. 



Do. 



Do. 

 Between 0.300 and 0.350. 

 Between 0.100 and 0.150. 



Do. 

 Between 0.700 and 0.750. 

 Not tested quantitatively; 

 copper all thrown out in 

 a few minutes. 

 Decomposed at tempera- 

 ture of test. 

 Between 0.025 and 0.050. 

 Less than 0.005. 



Table 7. — Discoloration of wood treated with preservatives and painted. 



Preservative 

 No. 



Preservative designated by 

 cooperator as — 



Condition of painted surface after exposure 

 for 1 month. 



1 





Very badly discolored and paint not dry. 

 Slightly yellow in spots; paint dry. 

 Very badly discolored; paint nearly dry. 

 Do. 



2 





3 





4.. 





S 





Do. 



6 





Very badly discolored; paint not dry. 

 Very badly discolored, and sticky in spots. 

 Slightly discolored; paint somewhat sticky. 

 Very badly discolored; paint not dry. 

 Do. 



7 





S 





9 





W 





11 





Do. 



12 





Do. 



13 . 





Do. 



14 





Do. 



15. 





Discolored gray; oil penetrated paint coating in sev- 

 eral places. 



Slightly discolored; paint sticky in spots. 



Paint discolored and collected in spots, leaving sur- 

 face partly bare; still very wet. 



Badly discolored; paint not dry. 



Very badly discolored; paint dry, but did not stick 

 to wood. 



Discolored; paint somewhat sticky. 



Slightly yellow in spots; paint slightly sticky. 



Slightly yellow in spots; paint dry. 



Appearance similar to untreated specimen. 

 Do. 



16..,.„ 





17 





18 





19 





SO.. 





21.... 





22 





23 





24 





25 





Do 



26 





Do. 



27 







23 





Slightly discolored. 



Appearance similar to untreated specimen. 



Discolored, pale yellow, and somewhat sticky. 



29 





30 









WASHINGTON : GOVERNMENT PRINTING OFFICE : 1915 



