Dimethyldiphenyl siloxanes and silicones
[CAS# 68083-14-7]

Identification

• Classification: Chemical reagent >> Organic reagent >> Siloxane
• Name: Dimethyldiphenyl siloxanes and silicones
• Synonyms: KF 54; KF 54-400CS; KF 54HV; MED 10-6600; Mirasil DPDM; Nikkol KM 1; OV 35; OV 5
• CAS Registry Number: 68083-14-7
• EC Number: 614-272-9

Properties

• Density: 1.04 g/mL (20 ºC)
• Boiling point: >250 ºC
• Flash point: 315 ºC

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	4	H332
Eye irritation	Eye Irrit.	2	H319

Discovory and Applicatios

Dimethyldiphenyl siloxanes and silicones are integral classes of organosilicon compounds that play a crucial role in numerous industrial and commercial applications. These compounds are characterized by their silicon-oxygen backbone, where silicon atoms are bonded to organic groups, specifically methyl (CH3) and phenyl (C6H5) groups. Their unique chemical structure imparts a wide range of properties, such as thermal stability, chemical resistance, low surface tension, and electrical insulating capabilities, which make them highly versatile and valuable in various industries.

The discovery of dimethyldiphenyl siloxanes and silicones dates back to the early 20th century, when chemists began to explore the chemistry of silicon and its potential applications. In 1901, chemist Frederic Kipping first synthesized the first siloxane compound, leading to the development of silicones. The unique structure of these compounds, with alternating silicon and oxygen atoms, allowed for the creation of highly flexible, stable, and heat-resistant materials, which spurred further interest in their commercial potential. Over time, scientists and engineers developed several types of silicones, including dimethyldiphenyl siloxanes, which are characterized by the substitution of two methyl groups and one phenyl group on the silicon atom.

Dimethyldiphenyl siloxanes and silicones have broad applications in industries such as electronics, automotive, construction, cosmetics, and pharmaceuticals. In the electronics industry, these materials are used in the production of adhesives, sealants, and coatings, where their electrical insulating properties and thermal stability are of critical importance. For instance, they are commonly used as encapsulants for electronic components, where they protect against moisture, dust, and extreme temperatures. Additionally, they are used in thermal management applications to dissipate heat and enhance the performance and longevity of electronic devices.

In the automotive industry, dimethyldiphenyl siloxanes and silicones are utilized in sealants and gaskets due to their ability to form durable, waterproof, and chemically resistant bonds. These materials help in creating long-lasting seals for windows, doors, and engines, contributing to the overall performance and safety of vehicles. Furthermore, silicones are commonly used as lubricants and additives in engine oils, improving efficiency and reducing wear and tear in mechanical parts.

The construction industry also relies on dimethyldiphenyl siloxanes and silicones for applications such as waterproofing, sealing, and coating materials. Their resistance to moisture, UV radiation, and harsh environmental conditions makes them ideal for exterior coatings and roof sealants. Silicone-based sealants are particularly popular for their ability to form flexible, strong bonds that can withstand temperature fluctuations and movement in building materials.

In cosmetics and personal care products, dimethyldiphenyl siloxanes and silicones are widely used for their smooth, non-greasy texture and their ability to enhance the spreadability and feel of products. These compounds are commonly found in hair care products, skin creams, deodorants, and makeup. They help improve the sensory experience of products by providing a silky smooth finish and promoting long-lasting moisture retention.

Dimethyldiphenyl siloxanes and silicones are also important in the pharmaceutical industry. They are used as excipients in drug formulations, where their ability to improve the solubility and stability of certain drugs is beneficial. Silicones are also used in the production of medical devices, such as catheters and implants, due to their biocompatibility and inert nature.

Despite their numerous advantages, there is ongoing research into the environmental impact and biodegradability of dimethyldiphenyl siloxanes and silicones. Efforts are being made to develop more eco-friendly versions of these materials, ensuring that their widespread use does not contribute to environmental harm.