Mingyi silicone（anhui）co,.ltd
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In advanced silicone chemistry, structure defines performance, and terminal functionality determines reactivity.
IOTA 616 is a hydride-terminated linear polydimethylsiloxane featuring reactive Si–H groups at both chain ends. This well-defined bifunctional structure makes it a critical intermediate in hydrosilylation, block copolymer synthesis, and addition-cure silicone systems.
Unlike random hydrogen-containing silicone fluids, IOTA 616 concentrates reactive sites exclusively at the chain termini, enabling predictable reaction pathways, reduced side reactions, and highly controlled polymer architecture design.
It is not merely a raw material — it is a structural foundation for engineered silicone materials.
Chemical Name: Hydride-Terminated Silicone Oil
Synonym: Hydride-Terminated Polydimethylsiloxane
CAS No.: 70900-21-9
Appearance: Colorless transparent liquid
Purity: ≥100%
| Viscosity (25°C, mPa·s) | Molecular Weight | H% | Density | Refractive Index |
|---|---|---|---|---|
| 2–3 | 500–600 | 0.5 | 0.90 | 1.395 |
| 100 | 6000 | 0.04 | 0.97 | 1.403 |
| 500 | 17200 | 0.01 | 0.97 | 1.403 |
| 1000 | 28000 | 0.007 | 0.97 | 1.403 |
| 10000 | 62700 | 0.003 | 0.97 | 1.403 |
Different viscosity grades allow precise control over crosslink density and reaction kinetics.
Reactive Si–H groups at both ends enable efficient hydrosilylation with vinyl- or allyl-functional compounds under platinum catalysis, ensuring controlled and predictable polymer growth.
By adjusting molecular weight and hydride content, users can fine-tune:
Crosslink density
Chain extension length
Hardness
Elongation at break
Elastic modulus
This flexibility supports advanced material engineering.
Compatible with various silicone systems and organic polymers, IOTA 616 acts as an effective structural bridge in hybrid silicone-organic materials.
Consistent quality and structural stability make it suitable for scalable industrial production and high-end material manufacturing.
Similar to IOTA 202 and IOTA 203, it provides excellent moisture resistance and long-term hydrophobicity.
Widely used to synthesize:
Epoxy-modified silicones
Amino-functional silicones
Polyether-modified silicones
Terminal-functional siloxanes
Its terminal structure ensures reaction precision and minimized side reactions.
Serves as a bridging unit in silicone-organic block copolymer systems, widely applied in:
Functional coatings
Sealants
Flexible elastomers
Specialty polymers
Used as a chain extender or crosslinker in LSR and HTV systems to:
Increase elongation
Improve toughness
Reduce hardness
Optimize mechanical balance
Acts as a starting material for resin modification, improving flexibility, surface slip, weather resistance, and moisture protection in plastics and coatings.
IOTA 616 is a bifunctional reactive platform enabling controlled silicone architecture design.
Its terminal Si–H structure delivers precision, reliability, and performance across hydrosilylation and addition-cure systems.
For advanced silicone engineering, IOTA 616 provides the structural control your formulations demand.
