18 BULLETIN 145, U. S. DEPARTMENT OF AGRICULTURE. 



Table 4. — Inflammability of treated wood. 



Preserva- 

 tive No. 



Preservative designated by co- 

 operator as — 



Tempera- 

 ture of igni- 

 tion (° C.). 



Days after 

 impregna- 

 tion — 



90 



Loss in 

 weight due 

 to burning 

 calculated 

 in per cent 

 of weight 

 before 

 ignition. 



Days sea- 

 soned — 



90 



Character of combustion. 



1 

 2 

 3 

 4 

 5 

 6 



3 



9 



10 



11 

 12 

 13 



1-1 

 15 



1*5 



17 



IS 



19 

 30 

 21 



22 

 23 



24 

 25 

 26 



27 



28 



29 

 30 



Untreated wood (hemlock). 

 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 crecsote, Fraction V . . . 



Water-gas-tar cresote, 1.0.51 



Water-gas-tar creosote, 1.012 



Water-gas-tar creosote, 1.070 



S. P. F. carbolineum 



Avenarius carbolineum. 

 C. A. wood preserver. . . 

 Hardwood tar 



Wood tar (Douglas fa). 

 Beechwood creosote 



Spirittine 



Preservol 



Wood-creosote oil. 



Timberasphalt. 

 Copperized oil.. 

 Fuel oil 



Kerosene 



Zinc chloride 



Zinc sulphate 



Zinc sulphate (by-product ). 

 B. M. preservative 



Sapwood antiseptic . 

 Sodium silicate 



Sodium fluoride. 

 Cresol calcium. .. 



320 

 174 



133 



113 



148 



183 



195 



172 



149 



231 



243 



213 

 215 

 190 



167 

 177 



194 



205 



178 



296 

 200 

 167 



22.5 

 306 

 286 

 269 

 223 

 287 

 231 

 238 

 243 

 263 



235 



247 

 241 



247 

 269 

 251 



310 



228 

 241 



231 

 1287 



1304 

 129S 

 1305 



1303 



1288 



Burned freely. 



Burned freely; black smoke; 

 easily extinguished. 



Burned very freely; easily ex- 

 tinguished. 



Burned freely; easily extin- 

 guished. 



Did not burn as well as creo- 

 sote; easily extinguished. 



Burned freely; extinguished 

 with difficulty. 



Ignited with difficulty; burned 

 poorly; easily extinguished. 



Did not burn freely; easily ex- 

 tinguished. 



Burned freely; difficult to ex- 

 tinguish. 



Burned like Avenarius car- 

 bolineum. 



Burned like coal-tar creosote, 

 but not so freely. 

 Do. 



Burned like creosote. 



Burned freely; dense black 

 smoke. 



Burned like coal-tar creosote. 



Burned freely; black smoke; 

 rathereasy to extinguish. 



Burned freely;. difficult to ex- 

 tinguished." 



Did hot burn as well as creo- 

 sote; easily extinguished. 



Burned very freely; very diffi- 

 cult to extinguish. 



Did not burn freely. 



Burned like coal-tar cresote. 



Burned very freely; very diffi- 

 cult to extinguish. 

 Do. 



Hard to ignite; burned poorly; 

 easilv extinguished. 

 Do. 

 Do. 



More difficult to burn than 

 zinc chloride. 



More difficult to burn than 



B. M. preservative. 

 Burned like zinc chloride. 

 Burned freely; white smoke; 



hard to extinguish. 



i Woods treated with salts were ignited as soon as their moisture content was reduced by air-seasoning 

 to 6 per cent, usually about 2 weeks after impregnation. For absorption of preservatives, see Table 3. 

 - See footnote 1, page 11. 



Note. — All salts burned for less than 3 minutes; all oils burned for 3 minutes and were then extinguished. 



