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Chemical Name: α,ω-Dihydroxy-Terminated Polydimethylsiloxane
CAS Number: 70131-67-8 (as provided; please verify before publication)
Keywords: Linear Hydroxyl Silicone Oil, Hydroxy-Terminated Polydimethylsiloxane, Silanol-Terminated Silicone Fluid, Silicone Rubber Additive, Silicone Functionalization, IOTA 1203M
Linear hydroxyl silicone oil, represented by IOTA 1203M, is a hydroxyl-terminated polydimethylsiloxane designed for silicone functionalization, organic material modification, and silicone rubber formulations.
Featuring a linear polysiloxane backbone with hydroxyl groups at both molecular ends, this material provides reactive sites for further chemical modification. It can be used as a starting material in the preparation of other silicone-functional silanes and as a component in selected organic modification systems.
IOTA 1203M is supplied as a colorless, transparent oily liquid. Two viscosity grades are available to accommodate different formulation and processing requirements.
For manufacturers seeking a reactive silicone intermediate rather than a conventional non-reactive silicone fluid, hydroxyl-terminated polydimethylsiloxane offers a useful platform for developing customized silicone-based materials.
The performance of hydroxyl silicone oil depends on its viscosity, hydroxyl content, molecular structure, and compatibility with the intended formulation.
The key characteristics of IOTA 1203M include:
Hydroxyl-terminated molecular structure: Provides reactive terminal hydroxyl groups for appropriate chemical modification reactions.
Linear polydimethylsiloxane backbone: Provides the characteristic structure of a linear silicone polymer.
Two viscosity grades: Allows users to select a grade according to processing and formulation needs.
Transparent liquid appearance: Suitable for applications where a clear liquid raw material is required.
Versatile modification potential: Can serve as a silicone intermediate or a component in selected silicone rubber formulations.
The actual performance of the finished material depends on the reaction system, formulation, curing conditions, and compatibility with other ingredients.
The following table summarizes the supplied technical specifications.
| Parameter | Grade A | Grade B |
|---|---|---|
| Appearance | Colorless, transparent oily liquid | Colorless, transparent oily liquid |
| Viscosity at 25°C (mm²/s) | 60–70 | 95–105 |
| Hydroxyl content | 1.1–2.0% | 0.8–0.9% |
| Water content | ≤ 0.5% | ≤ 0.5% |
Note: The hydroxyl content and viscosity ranges are based on the supplied product specifications. Please consult the current technical data sheet for the applicable test methods, specification limits, and grade confirmation.
Grade A has a lower viscosity range and a higher specified hydroxyl content than Grade B. These differences may influence processing behavior and the availability of reactive hydroxyl groups in a formulation.
Grade B has a higher viscosity range and a narrower, lower hydroxyl-content specification. It may be worth evaluating when a formulation requires a different balance between viscosity and reactive functionality.
The appropriate grade should be selected according to the intended reaction, target material properties, and processing requirements. Laboratory testing is recommended before commercial-scale production.
IOTA 1203M can serve as a starting material in selected chemical synthesis routes for producing silicone-functional intermediates. The hydroxyl end groups provide potential reaction sites for further functionalization.
The suitability of the material depends on the target compound, reaction pathway, catalyst system, and process conditions.
Hydroxyl-terminated silicone fluids can be considered for the modification of selected organic materials when the formulation or synthesis route supports the required chemistry.
Introducing silicone segments into a compatible material may help formulators investigate changes in surface characteristics, flexibility, lubricity, or other application-specific properties. The final results depend on the chemistry and structure of the modified material and should be confirmed through testing.
IOTA 1203M can be evaluated as an additive or reactive component in suitable silicone rubber systems.
Its potential role depends on the rubber formulation, crosslinking mechanism, compatibility with other components, and processing conditions. Users should assess its effects on curing behavior and the mechanical properties of the finished rubber through application-specific trials.
When selecting a linear hydroxyl silicone oil, formulators should consider four key factors:
Viscosity requirements: Determine the viscosity suitable for the intended mixing, dosing, or processing procedure.
Hydroxyl content: Evaluate the required reactive functionality based on the target reaction and formulation.
Water content: Confirm that the specified moisture level is compatible with the intended synthesis or application process.
End-use performance: Test the selected grade in the actual formulation to verify compatibility, processability, and final product performance.
For customers developing customized silicone materials, sharing the intended application and target properties with the supplier can help narrow down the appropriate grade.
IOTA 1203M provides two specified viscosity grades of linear hydroxyl silicone oil for customers working on silicone intermediates, organic material modification, and silicone rubber formulations.
Its defined viscosity and hydroxyl-content ranges offer a practical starting point for grade selection and formulation evaluation.
For industrial buyers, research and development teams, and silicone material manufacturers, the next step is to verify the technical data, conduct compatibility testing, and confirm performance under the intended production conditions.
Q1: What is linear hydroxyl silicone oil?
Linear hydroxyl silicone oil is a silicone polymer with hydroxyl groups at its terminal ends. It is commonly described as hydroxy-terminated polydimethylsiloxane or silanol-terminated polydimethylsiloxane.
Q2: What is IOTA 1203M used for?
According to its supplied product information, IOTA 1203M is intended for preparing other silicone-functional silanes, modifying selected organic materials, and use as an additive in suitable silicone rubber formulations.
Q3: What is the difference between Grade A and Grade B?
Grade A has a specified viscosity of 60–70 mm²/s and a hydroxyl content of 1.1–2.0%. Grade B has a specified viscosity of 95–105 mm²/s and a hydroxyl content of 0.8–0.9%. The choice depends on the requirements of the intended formulation or synthesis process.
Q4: How should hydroxyl silicone oil be selected for industrial use?
Selection should be based on viscosity, hydroxyl content, moisture requirements, reaction compatibility, and the performance targets of the final product. Testing in the intended formulation is recommended.
Q5: Can IOTA 1203M be used directly in any silicone rubber formulation?
Not necessarily. Its suitability depends on the specific silicone rubber system and curing mechanism. Formulation compatibility and curing performance should be verified before use.
Looking for a suitable linear hydroxyl silicone oil for silicone functionalization, organic material modification, or silicone rubber development?
Contact IOTA Silicone Oil to discuss your application requirements, compare the available viscosity grades, and request product documentation.
Please provide your intended application, target viscosity, hydroxyl-content requirements, and estimated quantity so that the appropriate grade can be evaluated for your project.
IOTA Silicone Oil — Silicone Materials and Application Solutions.
