What is the fine-grained topic of the following text: Munksjö and a leading suppliers of release papers for the Pressure Sensitive Adhesive (PSA) industry, has announced today the completion of an earlier laboratory study, revealing that the typical carrier of PSA labels - silicone coated glassine paper - meets compostability, in addition to biodegradability requirements. Only return the topic.
Compostability and biodegradability of silicone coated glassine paper for PSA labels.