Weather resistance of porcelain enamels exposed for seven years

Harrison, W. N.; Moore, Dwight G.

doi:10.6028/jres.042.004

Cited by 5 publications

(12 citation statements)

References 4 publications

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“…• Measurements made on panels cleaned with a commercial scouring powder; SD denotes the standard deviation of the individual readings about 'he The cause of the greater changes in color and gloss for acid-resistant enamels at Lakeland has not been determined, but it could be associated with (a) the higher values for annual sunshine, rainfall, and temperature, as given in table 2. or (b) the attack by organic acids produced by algae and fungi that were found to be attached on the surfaces of all panels at the Lakeland exposure site, and that were described in the earlier paper [4]. Similar growths have been found by Jones [12] to cause etching of certain optical glasses used in the tropics.…”

Section: Effect Of Variation In Weather Conditions At Four Exposure Ssupporting

confidence: 61%

“…The four most important requirements of a porcelain enamel finish that is to be used for outside exposure are (1) corrosion protection. (2) color stability, (3) ease of cleaning, and (4 absence of major changes in initial gloss. The hydrated layer usually assumes a lighter color than the original surface and gives a faded appearance to the panel.…”

Section: Discussionmentioning

confidence: 99%

“…The sulfur dioxide content of the atmosphere at the St. Louis site was found to be about 45 times as great as in Washington [3], yet table 4 shows that, on the average, the Washington panels were affected more by the 15-yr exposure than those at St. Louis. This could be caused by the heavier rainfall in Washington see table 2 .…”

Section: Effect Of Variation In Weather Conditions At Four Exposure Smentioning

confidence: 92%

“…Table 3 includes the gloss data for each enamel at the four exposure sites. 5 Comparison with the results of the 7-yr inspection [4] shows that the percentage of gloss retained in many cases was higher after 15 yr than it was after 7 yr. This effect is due to the difference in cleaning treatment, the panels at 7 yr having been washed with trisodium phosphate solution, whereas the scouring treatment was required to clean the specimens for the 15-vr measurements.…”

Section: Louis and Lakeland The Following Tabulationmentioning

confidence: 98%

“…was published in 1942 [3] and the second in 1949 [4], It was originally intended that the test would be terminated after 15 yr, but. because many of the enamels showed only a minor de-terioration after this testing period, it was decided to expose the Washington panels until a testing time of possibly 25 or 30 yr had been accumulated.…”

Section: The First Reportmentioning

confidence: 99%

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Fifteen-year exposure test of porcelain enamels

Moore¹,

Harrison²

1957

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Changes in gloss and color were taken as criteria of weather resistance. A direct relation existed between acid resistance and weather resistance, except that a few of the red enamels of good acid resistance showed a pronounced fading after exposure. A modified acid-resistance test w r as devised that separated red enamels that showed pronounced fading from those that were highly resistant to color change. The ease of cleaning was related to the weather resistance, the enamels that lost most of their initial gloss on weathering being more difficult to clean than those that showed high gloss retention. All of the enamels protected the steel from corrosion when initial coverage was complete. Except for a relatively few enamels, variations in climate at the four exposure sites had only a minor effect on their weathering behavior.

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Section: Effect Of Variation In Weather Conditions At Four Exposure Ssupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Effect Of Variation In Weather Conditions At Four Exposure Smentioning

confidence: 92%

Section: Louis and Lakeland The Following Tabulationmentioning

confidence: 98%

Section: The First Reportmentioning

confidence: 99%

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Fifteen-year exposure test of porcelain enamels

Moore¹,

Harrison²

1957

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Resistance of Porcelain Enamels to Weathering

Moore

1954

Symposium on Porcelain Enamels and Ceramic Coatings as Engineering Materials

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A study of the weather resistance of porcelain enamels has been under way at the National Bureau of Standards since 1939. A total of 768 1-ft-square panels are being exposed at four locations selected to represent temperate residential, temperate industrial, temperate salt-air, and semitropical residential. The results so far obtained show that most enamels are highly resistant to deterioration under the conditions existing at selected locations and, further, that those enamels that are not resistant can be eliminated prior to installation by simple laboratory tests. The results obtained from an inspection made after 7 years of exposure are given in the present paper.

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Building research at the National Bureau of Standards

Achenbach¹

1970

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The history of building research and technology at the National Bureau of Standards is as long as the history of the institution itself. The participation of the Bureau in the application of science and engineering to building materials and components played an early and important role in the development of steel and reinforced concrete as structural materials; in the understanding of the physics and chemistry of cement, lime and gypsum; in the evaluation of the fire properties of building components; in safe plumbing practices; in laboratory evaluation of the effects of weather on deterioration of building materials; and in measurement of the heat and sound transmission properties of building materials and constructions. The central and continuing objectives of the building research program are shown to be the development of new technical information and new measurement methods for building materials, components, and systems, and the application of this knowledge to the specifications for Federal procurement, to the national standards of the building industry, and to the building code structure of the nation. The Bureau has served as a major technical resource in three large-scale national efforts to accelerate the construction of economical and effective buildings for housing and commercial purposes. One of these efforts is currently in progress and is characterized by an emphasis on the design of buildings to meet the performance requirements of the user rather than through the specification of the properties of the materials used.

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Weather resistance of porcelain enamels exposed for seven years

Cited by 5 publications

References 4 publications

Fifteen-year exposure test of porcelain enamels

Fifteen-year exposure test of porcelain enamels

Resistance of Porcelain Enamels to Weathering

Building research at the National Bureau of Standards

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