ASTM D3274 PDF

The ASTM D test specifically aims to establish the relative resistance of paint films to the propagation of mold and mildew under optimum fungal growth conditions. Incubation occurs in a highly regulated environmental chamber of standardized dimensions over a 4-week period. For this test, the product is suspended above a bed of spore-inoculated soil within a chamber kept at high humidity. A coating which does not protect against fungal growth should exhibit surface defacement evidenced by fungal hyphae filaments visible on the surface after 4 weeks of incubation. This test emulates realistic conditions for coatings designed for use in interior environments.

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More D Because of their dark pigmentation, it is frequently difficult to distinguish fungi from dirt or soil particles. 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. 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. Scope 1. The visual rating of paint surface disfigurement due to fungal or algal attack is required in order to compare the performance of different coatings.

This method may be used to rate interior fungal or algal growth, but it should be noted that the growth patterns on interior surfaces are different than exterior due to the lack of weathering influences. It is primarily intended for test specimens, but can also be sued for rating mildew growth on larger structures such as entire houses. If this is used for large areas, the project should be broken down into smaller sections.

The visual scales are meant to be used by the unaided eye to rate algal, fungal, or dirt disfigurement on larger surface areas such as test panels, siding boards, or entire buildings. Techniques are included for the differentiation of soil and dirt. Test procedures such as Practices D, D, and G7 are available describing natural exposure tests that can be used to expose paint films, in order to create fungal or algal growth. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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ASTM D3274 Fungal Defacement Rating Method

The visual rating of paint surface disfigurement due to fungal or algal attack is required in order to compare the performance of different coatings. This method may be used to rate interior fungal or algal growth, but it should be noted that the growth patterns on interior surfaces are different than exterior due to the lack of weathering influences. It is primarily intended for test specimens, but can also be sued for rating mildew growth on larger structures such as entire houses. If this is used for large areas, the project should be broken down into smaller sections. The visual scales are meant to be used by the unaided eye to rate algal, fungal, or dirt disfigurement on larger surface areas such as test panels, siding boards, or entire buildings. Techniques are included for the differentiation of soil and dirt.

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ASTM D3273 Fungal Resistance Test for Coated Surfaces

More D Because of their dark pigmentation, it is frequently difficult to distinguish fungi from dirt or soil particles. 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. 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. Scope 1. The visual rating of paint surface disfigurement due to fungal or algal attack is required in order to compare the performance of different coatings.

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