ASTM D3274 PDF

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.

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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.

Coated test panels and non-coated substrates are introduced randomly to the sporolating chamber by vertical hanging. Panels are rated once a week for 4 weeks by estimating the level of fungal defacement on a scale of 0 to 10 10 is no visual defacement. The method provides stringent testing conditions to mimic an extreme environment. The test can easily be adapted to include several species of fungus for custom projects. The test offers a straigtforward methodology to control for extraneous variation.

The test uses easily accessible, low-tech tools and standard microbiology supplies. Several samples can be tested in one chamber. ASTM D compares growth under static temperature and humidity parameters, whereas real product usage may be better represented by a range of temperature and humidities in some instances. If you are interested in testing an antifungal substrate rather than an antifungal coating, please note that this method can be used as a basis for customized antifungal testing.

Such custom tests can produce a relative measure of fungal resistance can still be established. Microchem can help speed your project to completion. Quick Contact.

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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.

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ASTM D3273 Fungal Resistance Test for Coated Surfaces

Full Description 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.

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