Resistance of Synthetic Polymeric Materials to Fungi ASTM G21
Resistance of plastics and synthetic polymeric materials toward fungal growth is determined by ASTM G21 test method. Synthetic polymers are usually fungus-proof, however, additives like stabilizers and colorants may cause fungal growth in polymeric materials.
Scope:
Fungal resistance of plastics and synthetic polymeric materials is determined by ASTM G21. The test polymeric materials can be in the form of fabricated and molded articles, sheets, tubes, rods, and film materials. The changes in mechanical, optical, and electrical properties are also determined. Usually, the synthetic polymeric materials are resistant to fungi but there might be additives used in the polymer such as stabilizers, colorants, and plasticizers that may not be resistant to fungi and may contribute to fungal growth. ASTM G21 is typically used to test the products that are made from plastics and foam but it can also incorporate a wide range of other products and materials.
Test Procedure:
For Fungus Testing by ASTM G21, the fungi are grown on solid apparatus. A pooled spore suspension is made from Chaetomium, Aspergillus, Penicillium, Aureobasidium, and Trichoderma spores. The spore suspensions are cleaned thoroughly, eluted in a solution having minimum salt, and then standardised. The test samples are placed in triplicate in a petri dish or other suitable containers with minimum salt agar before pooled spore is sprinkled on the test samples. This process is repeated for the negative control i.e., agar only and positive control i.e,. fungal growth control. These preparations are incubated for about 28 days in suitable humidity conditions. A performance score is given for the samples on the basis of fungal growth after 28 days and pictures of each test sample are taken at uniform intervals.
Sample size:
The simplest sample can be of 5050 mm (22 inches) piece, a diameter piece of 50 mm ( 2 inches), or a rod or tubing piece of 76 mm (3 inches) long for the ASTM G21 practice. The film-forming materials like coatings can be tested in the form of films having at least 5025 mm (21 inch) in size.
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
Send us a request
Process for testing
STEP 01
You share material and testing requirements with us
STEP 02
We ensure your sample pick-up in an ensured manner
STEP 03
We deliver test report to your inbox
Just share your testing requirements and leave the rest on us!