Document 1OkNMLKRJYwgvErB4J3J2MLa
ALLIED RESEARCH BULLETIN NUMBER RC-59
TiEITE LEAD COMPARATIVE DUfUBILITI OF LEADING BRANDS
Adams
May 27, 1940
ALLIED RESEARCH LABORATORIES CHICAGO, ILLINOIS
N12522
0007-SWP-000006829
-55V
i --- ' *-2*2--- :--
Bhlta Lead - CoE-paratlve Durability of Leading Brands
' flonsral Statement
.
The purpose of this series of exposures t h is to establish any dif-
references in durability of the leading White Loads, and the effect, if any, of vari-
\ &tions in the Carbonate to Hydrate ratio within the Units of commercial product!;
v. . -`fast Procedure
..
- '
. The various White Leads were ground in Linseed Oil and applied according to the standard "Yhite Lead in Oil" practice, three coats on White Pino, i vertical exposure, Chicago paint test farm. National White Lead iu Oil whs need as the guide on each panel.
gyiosura Results
The exposure period of the nain series was S-l/2 years, sufficient to evaluate the inportent durability features. The MacGregor Lead constitutes on exception, the exposure periods being 2-1/4 end l-l/ years.
... So. Brand
Colei**
Chalk in y
Fissure Pat .-a
Cracking Flaking
1. National 0. D. High Carbonate
Std.
Considerable Nor-... _
Slight
Absent
2. National H.T.S. v- Low Carbonate
Slightly Blight to
Snail
whiter considerable
Slight
Absent
[; 3. National Carter High Carbonate
^CJU;' i.
Cor*ctc.or'ibl'3 No it .' v-l
Slight
Very sligh
4. Eagle Picher 0. D. Equt-1 ' " . Medium Carbonate
Eli/ho t,
iwnx l
Cu:i s iderf.bi
Sii.ht
Very sligh
|i Ss
6.
j . ,
S--ll 0. D e .
High Carbonate
.
S-W 0. D. Lo t / Carbonate
-Equal
Considerable Horncl
Equol
Considerable Large
Slight to Slight considerable
Slight
Absent
7. S-W Q. P . ' High Carbonate
6. S-W Q. P. Low Carbonate
Equal
Consi-erablc Normal
Very
Slight
slightly
whiter
'Stall
Slight Slight
Absent. Absent
Cont. on next page.
0007-SWP-000006830
Results - Cont.
m----
I L*
'
Bras!. * -A MacGregor
2-1/4 Irs.
Color*
Chatting.
Fissure Pattern
Cracking
Slightly Considerable Irregular Slight whiter.
Flakinr Absent
g_B MacGregor 1-1/2 Irs.
Slightly Considerable Linear
whiter
.
Slight
Very slig.
9-C MacGregor 1-1/2 Irs.
Slightly Slight
whiter
Large
Slight to Very sligh
rectangular considerable
*o3aparison against National Old Dutch
Discussion of Results
No marked superiority of one Lead ver another has been found.
Different lots of-KauGregcr Lead .u irregularity of performance.
National K.T.S. Lead t:id `die 2-ft cirAIar type of Loac, No. 8, have given some evidence of superiovity wiring tiie oppe .rare period, out the difference rat 3-1/2 years is not marked.
CHA;AR
0007-SWP-000006831