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.ALLIED RESEARCH BULLETIN NUMBER RC-59
LEITE LEAD COMPARATIVE DURABILITY OF LEADING BRANDS
Adams
May 27, 1940
ALLIED - RESEARCH LABORATORIES CHICAGO, ILLINOIS
N12S22
0007-SWP-000006829
White Lead - Comparative Durability of Leading Brands
feral Statement
^ The purpose of this series of exposures was to establish any bif-
r^'ferences in durability of the leading White Loads, and the effect, if any, of vuri-
' etions in the Carbonate to hydrate ratio within the Units of commercial product!;
v.
'
-'Test Procedure
The various "Jhite Leads were ground in Linseed Oil and applied according to the standard "YThite Lead in Oil" practice, three coats on White Pine, f. vertical exposure, Chicago paint test farm. National'White Lead iu Oil whs used as the guide on each panel.
Exposure Results
The exposure period of the nain series as S-l/2 years, sufficient 'to evaluate the inportent durability features. The MacGregor Lead constitutes an exception, the exposure periods being 2-1/4 end l-l/ years.
No. Brand
Colei**-
Chalkin'--
Fissure Pat "i
Cracking
Fl.'Ain.-
1. National 0. D. High Carbonate
Etd.
Considerable Her'... _
Slight
Absent
2. National H.T.S. Low Carbonate
Slightly Blight to
Snail
whiter
considerable
Slight
Absent
3. National Carter High Carbonate
'-i. Cotic.'.:r
'Normal
Slight
Very align
"4."'' Eagle Picher 0. D. Equal Medium Carbonate
Eli/ho to Cun siderf.bi
iLxre 1
Slight
Very sllgh
5, S-n 0 D e High Cerb&nato
Equal
Considerable ilorncl
Slight to Slight considerable
6.
a.`
>-
7.
S-W 0. D. Lo t / Carbonate
S--7 Q. P . High Carbonate
e. S-W Q. P. Low Carbonate
Equal
Considerable Large
Equal
Considerable Muracl
Very
Slight
slightly
v.-hiter
Slight Slight Slight
Absent Absent Absent
Co.nt. on next page.
0007-SWP-000006830
sure Results - Cent.
8^ Brand,
MacGregor -1/4 Irs,,
S-B MacGregor 1-1/2 Yrs.
9-C MacGregor
1-1/2 Yrs.
Colors
CV:r.lSr.in.;
Fissure pattern
Cracking
Slightly Considerable Irregular Slight whiter
Flaking Absent
Slightly Considerable Linear whiter
Slight
Very slig.
Slightly Slight whiter
Large
Slight to Very sligh
rectangular considerable
E-Comparison against National Old Dutch
Mscussion of Results
No narked superiority of one Load ror another-has been found.
Different lots of-MacGregor Load .a irregularity of performance.
r]-- National E.I.S. Lead thd ilia S-7i similar - type of Lean, No. 8, have given some evidence of superiority druring the oi^ccur.' period, out the difference
pat 3-1/2 years is not narked.
CEA; AR
0007-SWP-00000S831