ASTM D6954 approval

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ASTM D6954-04

The scope of the project is to assess the degree of physical property losses of polymers by a thermal oxidation process and determine the rate of aerobic biodegradation of the submitted test product as well as its ecological impact in the defined applications and disposal environments after degradation. This method is divided into three tiers, whose goals and objectives are outlined in the
following headings.

3.1 Tier 1-Heat Aging of Oxidatively Degradable Plastics
The goal of Tier 1 is to evaluate the extent of molecular weight loss resulting from thermal oxidation of test material using ASTM D5510-94（2001）. The test material is incubated in a Forced-Ventilation or Gravity-Convection Oven at a temperature not exceeding 20℃ from the end use and maintained at a relative humidity level for a defined period of time (depending on rate of fragmentation). Before and after exposure, the following analyses are performed on the test material: molecular weight, polydispersity index, mass of volatiles, and % gel. Weight loss will also be determined upon termination of the oxidation process.
All observations and conditions (time, temperature, and humidity) will be recorded on a daily basis.

UV light exposure can be an alternative route for oxidation testing in Tier 1.
Inquire for more details regarding pricing for UV exposure.
3.2 Tier 2-Biodegradability Testing
The goal of Tier 2 is to determine the degree and rate of aerobic biodegradation of a test material from Tier 1 using ASTM D5338-98(2003). In this method, the test material is incubated with a compost inoculum and the percentage of biodegradability is obtained by determining the percent of conversion of carbon in the test material to carbon in the form of CO2 in the gas phase. The inoculum can be derived from several sources ranging from commercially operated compost facilities to yard/plant matter compost. The aerobic decomposition occurs under high-solids conditions with weekly mixing of the contents to provide optimum