Standard Test Method for Evaluating Degree of Surface Disfigurement of Paint Films by Fungal or Algal Growth, or Soil and Dirt Accumulation

Importancia y uso:

4.1 The growth of fungi in and on the surface of paint films represents a major cause of discoloration or disfigurement of painted surfaces. Because of their dark pigmentation, it is frequently difficult to distinguish fungi from dirt or soil particles.

4.2 Use of Pictorial Standards:  

4.2.1 The pictorial references that are part of this test method are for illustration purposes and may be used for visual comparisons.

4.2.2 The diagrams represent an idealized schematic of various growth levels on paint films. They are intended as a representation only, but will serve as a useful guideline to establish amount and type of growth.

4.2.3 The diagrams represented in Fig. 1 are not derived from a linear scale. The scale is intended to provide for more discrimination at the earlier stages of fungal or algal growth. It is at these levels that greater discernment is necessary.

4.2.4 Comparisons made on dark colored substrates will be much more difficult, and will therefore require much more care and attention. It must be noted that because it is difficult to distinguish mild fungal or algal growth on the very dark substrates, there may be a tendency to under-rate those specimens.

Subcomité:

D01.28

Referida por:

D3456-24, E1797-12R17E01, E3369-24, E1428-24, E1795-20A, C1841-23, C1483_C1483M-17R22, E3364-22, D6763-16R22, D4610-98R21, C0647-19

Volúmen:

06.01

Número ICS:

87.040 (Paints and varnishes)

Palabras clave:

disfigurement; fungus; mildew; pictorial standards;