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From page 5... ... ABSTRACTS AND R E V I E W S 233 Holmes, C . Read the entire page →
From page 6... ... T A B L E I Results of fire tests on western redcedar shingles after 1,000 hours' accelerated weathering Results of burning brand tests Results of Schlyter tests Chemical Coating Burning Chemical Coating Type Average Codt ! Treating process retention - brands retention - of flame No (dry) Read the entire page →
From page 7... ... 24 Impregnated, A W P A type D , coating of nreservafcive .seal(>r with tricresyl phosphate 6 3 42 25 0 0/7 6 3 41 25 9 do 3 do 6 3 41 26 0 0/6 6 3 41 25 6 Severe 23 Vacuum-pressure impregnations and additional reactions 25 Impregnated, A P O 6 3 0 0 0/6 6 3 0 0 Mi ld 3 do 6 3 0 0 0/7 6 3 0 0 Severe 14 26 do 3 8 0 0 0/8 3 8 0 0 Mi ld 3 do 3 8 0 0 0/8 3 8 0 0 Severe 20 28 Impregnated, T H P C 2 7 0 0 1/8 2 7 0 0 Mi ld 27 do 2 7 0 0 1/7 2 7 0 0 do 27 20 do 4 8 0 0 0 8 4 8 0 0 do 20 do 4 8 0 0 0/8 4 8 0 0 do 15 31 Impiegnated, dicyandiamidephosphoric acid-foi maldehj de 5 0 0 0 3 /8 5 0 0 0 do i do 5 0 0 0 3 /8 3 0 0 0 Severe 26 ^2 do 8 3 0 0 2 /8 8 3 0 0 Mi ld 3 do 8 3 0 0 1/8 8 3 0 0 Severe 16 33 Impiegnated, dicyandiamidephosphoric acid 7 3 0 0 2 /8 7 3 0 0 Mi ld 4 do 7 3 0 0 0/8 7 3 0 0 Severe 25 34 do 9 3 0 0 1/8 9 3 0 0 Mi ld 4 do 9 3 0 0 1/7 9 3 0 0 Severe 20 35 Impregnated, zinc sulfate-zinc sihcofluoride-urea 12 9 0 0 5/6 12 9 0 0 Mi ld 7 do 12 9 0 0 4/7 12 9 0 0 Severe 32 ' I n square feet per gallon of coating ' Grams of dry coating per square foot of surface ' D r y chemical retention not known * D r y chemical retentions are calculated as zinc borate ' Panels had a light glow on butt edges for about 11 min ' Heavy afterglowmg Extinguished with water after 10 mm ' Afterglow along several of the butt edges Extinguished with water after 27 min Glowing may have continued until the plywood backing ignited « Afterglow along butt edge at one place Self-extinguished at 24 7 min I I a to a to CO Read the entire page →

From page 5...

... ABSTRACTS AND R E V I E W S 233 Holmes, C .

Read the entire page →

From page 6...

... T A B L E I Results of fire tests on western redcedar shingles after 1,000 hours' accelerated weathering Results of burning brand tests Results of Schlyter tests Chemical Coating Burning Chemical Coating Type Average Codt ! Treating process retention - brands retention - of flame No (dry)

Read the entire page →

From page 7...

... 24 Impregnated, A W P A type D , coating of nreservafcive .seal(>r with tricresyl phosphate 6 3 42 25 0 0/7 6 3 41 25 9 do 3 do 6 3 41 26 0 0/6 6 3 41 25 6 Severe 23 Vacuum-pressure impregnations and additional reactions 25 Impregnated, A P O 6 3 0 0 0/6 6 3 0 0 Mi ld 3 do 6 3 0 0 0/7 6 3 0 0 Severe 14 26 do 3 8 0 0 0/8 3 8 0 0 Mi ld 3 do 3 8 0 0 0/8 3 8 0 0 Severe 20 28 Impregnated, T H P C 2 7 0 0 1/8 2 7 0 0 Mi ld 27 do 2 7 0 0 1/7 2 7 0 0 do 27 20 do 4 8 0 0 0 8 4 8 0 0 do 20 do 4 8 0 0 0/8 4 8 0 0 do 15 31 Impiegnated, dicyandiamidephosphoric acid-foi maldehj de 5 0 0 0 3 /8 5 0 0 0 do i do 5 0 0 0 3 /8 3 0 0 0 Severe 26 ^2 do 8 3 0 0 2 /8 8 3 0 0 Mi ld 3 do 8 3 0 0 1/8 8 3 0 0 Severe 16 33 Impiegnated, dicyandiamidephosphoric acid 7 3 0 0 2 /8 7 3 0 0 Mi ld 4 do 7 3 0 0 0/8 7 3 0 0 Severe 25 34 do 9 3 0 0 1/8 9 3 0 0 Mi ld 4 do 9 3 0 0 1/7 9 3 0 0 Severe 20 35 Impregnated, zinc sulfate-zinc sihcofluoride-urea 12 9 0 0 5/6 12 9 0 0 Mi ld 7 do 12 9 0 0 4/7 12 9 0 0 Severe 32 ' I n square feet per gallon of coating ' Grams of dry coating per square foot of surface ' D r y chemical retention not known * D r y chemical retentions are calculated as zinc borate ' Panels had a light glow on butt edges for about 11 min ' Heavy afterglowmg Extinguished with water after 10 mm ' Afterglow along several of the butt edges Extinguished with water after 27 min Glowing may have continued until the plywood backing ignited « Afterglow along butt edge at one place Self-extinguished at 24 7 min I I a to a to CO

Read the entire page →

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