(1) Mildew-proof grades are divided into 0, 1, 2, and 3 grades, with 0 being the highest grade, and grades 3 and below being low-grade mildew-resistant grades.
0: The spores on the surface are not long, that is, no growth is observed under the microscope (magnification 50 times) (there is a strong antifungal effect);
Grade 1: Trace production, that is, growth visible to the naked eye, but the growth coverage area is less than 10% (with antifungal effect);
Grade 2: The growth area of mold must not be less than 10% and not more than 25%;
Grade 3: The production area of spore mold exceeds 25%.
(2) The general anti-mildew level of the general TPU is at level 1 (long mold level meets level 0 has strong anti-mildew effect, long mold level meets level 1 has anti-mold effect), but there are no exceptions, if you need to achieve Grade 0, can use food grade and medical grade TPU. The spores commonly used for testing anti-mildew grades are Aspergillus terreus, Aspergillus niger, Paecilomyces brevis, Penicillium tenuiscens, Penicillium striiformis, Trichoderma viride, Penicillium versicolor, Pleurotus spp. (Test cycle is 28 days)
←Previous: Performance of the TPU