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Chemical Name: Hydroxyl-Terminated Polydimethylsiloxane
CAS Number: 70131-67-8
EINECS Number: 615-070-3
Keywords: IOTA 1203, hydroxyl-terminated silicone oil, silanol-terminated polydimethylsiloxane, hydroxyl silicone fluid, silicone rubber structure control agent, textile softening agent, release agent, leather surface treatment, paper release treatment.
Hydroxyl-terminated silicone oil is a functional silicone material characterized by reactive hydroxyl groups at the ends of its molecular chains. It combines the characteristic properties of a polysiloxane backbone with the chemical reactivity of terminal silanol groups, making it suitable for silicone rubber formulation and various surface treatment applications.
IOTA 1203 is a general-purpose hydroxyl-terminated polymethyl silicone oil developed for applications requiring a reactive silicone material with low viscosity and a relatively high hydroxyl content. It is primarily used as a structure control agent in silicone rubber and as a softening or release treatment agent for textiles, paper, and leather materials.
With its colorless, transparent liquid appearance, IOTA 1203 offers a convenient starting material for formulators seeking hydroxyl-functional silicone fluids for industrial applications.
The main technical specifications of IOTA 1203 are summarized below.
| Parameter | Specification |
|---|---|
| Product grade | IOTA 1203 |
| Chemical name | Hydroxyl-terminated polydimethylsiloxane |
| CAS number | 70131-67-8 |
| EINECS number | 615-070-3 |
| Appearance | Colorless, transparent liquid |
| Viscosity at 25°C | ≤ 30 mm²/s |
| Hydroxyl content | ≥ 8.5% |
These specifications make IOTA 1203 a candidate for formulations requiring a low-viscosity hydroxyl-functional silicone fluid. Actual suitability depends on the formulation, processing conditions, and the performance requirements of the final product.
One of the principal applications of IOTA 1203 is its use as a structure control agent in silicone rubber formulations.
In silicone rubber systems, silica fillers can interact with polymer chains and contribute to changes in compound viscosity, processability, and storage behavior. Hydroxyl-functional silicone materials can participate in interactions with silica surface silanol groups, helping formulators manage filler–polymer interactions.
Depending on the silicone rubber formulation and processing conditions, IOTA 1203 may help improve compound processability and control structural changes during storage.
The appropriate addition level should be established through laboratory testing, taking into account the silicone rubber type, filler characteristics, curing system, and required mechanical properties.
Hydroxyl-terminated silicone oil can be considered for textile finishing formulations designed to improve fabric hand feel and surface characteristics.
Silicone-based finishing agents are widely used to provide a smoother, softer tactile sensation and improve the handling properties of treated fabrics. IOTA 1203 can serve as a functional silicone component in suitable textile treatment systems.
Its performance depends on the emulsification method, formulation compatibility, application concentration, and finishing process.
In paper processing, silicone materials are used in selected release applications where controlled surface adhesion is important.
IOTA 1203 may be evaluated as a hydroxyl-functional silicone component in compatible paper treatment formulations. Its terminal hydroxyl groups can provide opportunities for chemical interaction or further modification, depending on the coating chemistry.
For applications requiring a cured silicone release coating, formulators should verify whether IOTA 1203 is compatible with the selected crosslinking system and whether the resulting coating achieves the required release force, adhesion, and durability.
Silicone-based materials are used in leather treatment formulations to adjust surface feel, smoothness, and handling characteristics.
IOTA 1203 may be incorporated into suitable formulations for leather surface treatment, subject to compatibility and performance testing. The resulting finish depends on the leather substrate, other formulation ingredients, application method, and drying or curing conditions.
Because IOTA 1203 contains terminal hydroxyl groups, it may also be considered as a starting material for selected silicone modification or condensation reactions.
Potential uses depend on the intended reaction chemistry, molecular structure requirements, and product specifications. Reaction conditions and compatibility should be confirmed experimentally before commercial implementation.
Compared with silicone fluids that do not have reactive terminal hydroxyl groups, hydroxyl-terminated silicone oils offer additional opportunities for chemical interaction and formulation design.
Key considerations include:
Reactive terminal groups: Silanol groups can participate in suitable condensation and modification reactions.
Low viscosity: IOTA 1203 has a specified viscosity of no more than 30 mm²/s at 25°C, supporting evaluation in formulations where a relatively low-viscosity silicone fluid is required.
Multiple application possibilities: The product can be evaluated for silicone rubber structure control and selected textile, paper, and leather treatment systems.
Formulation flexibility: Its suitability can be assessed in different systems by adjusting the addition level, processing conditions, and compatible formulation components.
The final performance of hydroxyl-terminated silicone oil depends on its molecular characteristics and the complete formulation. Application testing remains essential.
When selecting a hydroxyl-terminated silicone oil, buyers and formulators should consider the following factors:
1. Target application: Determine whether the primary objective is silicone rubber structure control, fabric softening, paper release, leather treatment, or chemical modification.
2. Viscosity requirements: Match the silicone fluid viscosity to the mixing, coating, impregnation, or other processing requirements.
3. Hydroxyl content: Evaluate the hydroxyl content required for the intended reaction, surface interaction, or formulation behavior.
4. Compatibility: Check compatibility with the base polymer, silica filler, emulsifiers, crosslinking agents, and other formulation components.
5. Final performance: Test relevant properties such as processability, storage stability, softness, release performance, adhesion, and durability.
For applications with specific technical requirements, customers should consult the supplier to confirm the appropriate grade and obtain the relevant technical documentation.
IOTA 1203 is a general-purpose hydroxyl-terminated polymethyl silicone oil, also described as silanol-terminated polydimethylsiloxane. It is a colorless, transparent liquid with a viscosity of ≤ 30 mm²/s at 25°C and a hydroxyl content of ≥ 8.5%.
Typical applications include silicone rubber structure control and selected textile, paper, and leather treatments. Depending on its specifications and formulation compatibility, it can also be evaluated as a functional raw material for silicone modification.
IOTA 1203 is intended for use as a structure control agent in silicone rubber formulations. Its effectiveness depends on the rubber system, silica filler, processing conditions, and target compound properties.
It can be evaluated as a component in suitable silicone-based textile finishing formulations. Emulsification, formulation compatibility, and fabric performance should be confirmed before large-scale use.
The main specifications are a colorless, transparent liquid appearance, viscosity at 25°C of ≤ 30 mm²/s, and hydroxyl content of ≥ 8.5%. Its CAS number is 70131-67-8.
IOTA provides silicone materials for industrial applications, including silicone fluids and functional silicone products for rubber, coatings, surface treatment, and other formulation needs.
If you are looking for a hydroxyl-terminated silicone oil for silicone rubber structure control, textile softening, paper release, or leather treatment, contact IOTA to discuss your application requirements.
Please provide your target application, desired viscosity, hydroxyl content requirements, and processing conditions so that the appropriate product grade and technical information can be evaluated.
Product: IOTA 1203 Hydroxyl-Terminated Silicone Oil
CAS: 70131-67-8
Website: https://www.ethylsilicone.com/
Contact: IOTA Silicone Oil technical and sales team
Note: Product suitability and final performance should be confirmed through application-specific testing. The information in this article is intended for technical reference and does not replace the product's official technical data sheet.
