Paint Technology and Tests

by Henry A. Gardner

“In [Table No. 2] there is shown the rating obtained by those panels which were considered by the committee as meriting from 8 to 10, and having given the best all-round service.

Table No. 2.—Analysis of Averages. Grade of Excellence from
8 to 10

Plate	Pigment	Average
34	American vermilion (basic chromate of lead)	10.0
41	Chrome green	9.8
49	Lead and zinc chromate	9.7
39	Zinc chromate	9.5
40	Zinc and barium chromate	9.5
51	Black oxide of iron	9.5
4	Sublimed white lead	9.0
44	Prussian blue	9.0
5	Sublimed blue lead	8.8
20	Willow charcoal	8.8
222	Composite paint	8.8
45	Prussian blue	8.5
111	Composite formula	8.5
9	Orange mineral	8.3
10	Red lead	8.3
555	Composite paint	8.2
12	Bright red oxide of iron	8.1
2000	1 coat zinc chromate; 1 coat iron oxide	8.1
14	Venetian red	8.0
888	Composite paint	8.0

Comparison of Results. It is of interest to compare with [Table 2 of the above report], [Table 2 of the 1910 report] of Committee U of the American Society for Testing Materials. Both charts show the highly inhibitive pigments to be in the lead.

COMMITTEE U REPORT 1910

Table II.—Analysis of Averages. Grade of
Excellence from 8 to 10

(Only resistance to corrosion was considered, and only
pigments which were common to both tests are included)

No.	Pigment	Average
34	American vermilion (chrome scarlet)	9.8
41	Chrome green (blue tone)	9.7
40	Zinc and barium chromate	9.7
5	Sublimed blue lead	9.6
4	Sublimed white lead	9.5
49	Zinc and lead chromate	9.5
39	Zinc chromate	9.4
12	Bright red oxide	9.3
44	Prussian blue (water stimulative)	9.2
16	Natural graphite	9.1
9	Orange mineral (American)	9.0
36	Medium chrome yellow	9.0
2	White lead (quick process)	8.9
20	Willow charcoal	8.8
45	Prussian blue (water inhibitive)	8.8
1	White lead (Dutch process)	8.7
10	Red lead	8.7
7	Zinc lead white	8.0