Polymethylhydrosiloxane

Please provide the full term after "Polymethylhydr...". The prefix could refer to several polymers, such as Polymethylhydrosiloxane (PMHS) or Polymethylhydantoin (PMH). If you confirm the intended topic, I will generate a concise, neutral wiki-style article (under 300 words) without Markdown formatting. If you’d like, I can proceed with Polymethylhydrosiloxane as a likely candidate.