In the vast world of chemical materials, methylphenyl cyclosiloxane (CAS No. 68037 - 54 - 7, including 546 - 45 - 2, 77 - 63 - 4, 34239 - 75 - 3), IOTA R21 stands out with its remarkable properties, becoming a highly sought - after material in numerous fields.

Impressive Purity for Reliable Quality

The active substance content of this product is quite remarkable, available in two specifications: greater than 99.0% and 99.85% (polymer - grade). High purity is a key feature that minimizes the impact of impurities on product performance during application. This provides a stable and reliable foundation for subsequent processing and use. Whether in fine chemical production or high - end fields with stringent material purity requirements, it can well meet the needs.

Outstanding Physical Characteristics

In terms of morphology, it appears as a colorless liquid at 25℃. This pure appearance not only facilitates observation and operation but also to some extent reflects its high quality. Its boiling point ranges from 160 - 260℃ under a pressure of 0.13kPa. This characteristic allows it to function stably under specific temperature and pressure conditions, making it suitable for a variety of process requirements. With a density of 1.125g/cm³ at 25℃, the reasonable density provides an accurate reference for material proportioning during mixing and compounding processes.

Excellent Safety and Optical Properties

The flash point is greater than 160℃ (closed - cup), indicating a high level of safety during storage and use, reducing the risk of fire and other potential hazards. The refractive index is 1.545 at 25℃. Its excellent optical properties offer broad application prospects in the field of optical materials, meeting specific requirements for light propagation and refraction.