The ICH document for Stability Testing of New Drug Substance and Products is mainly geared towards stability testing of active ingredients that will be used in a medicine and the stability testing of the actual medicinal product ..
be midfuil that the purpose of stability testing is to provide evidence on how the quality of a drug substance or drug product varies with time under the influence of a variety of environmental factors such as temperature, humidity, and light, and to establish a re-test period for the drug substance or a shelf life for the drug product and recommended storage conditions.
The choice of test conditions defined in this guideline is based on an analysis of the effects of climatic conditions in the three regions of the EC, Japan and the United States. The main ICH guideline addresses climatic zones I and II.
The principle has been established that stability information generated in any one of the three regions of the EC, Japan and the United States would be mutually acceptable to the other two regions,
This guide refers to other zones http://www.emea.europa.eu/pdfs/human/ich/042102en.pdf
I have a template but it is geared towards medicines and I do not think it would be of much use for you as a resin as you would possibly need a different stability protocol/test design
As a start I would use the temperature and humidity levels oultined in the ICH guidance -- I am not sure if there is an ISO or international standard for testing of stability of plastics or resins