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IOTA 8152-8154 is a series of long-lasting delayed platinum catalysts designed for addition-cure silicone rubber and one-component silicone systems. Based on a platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex, also known as the Karstedt catalyst, this catalyst series provides controlled curing behavior, extended storage stability under suitable formulation conditions, and rapid curing at elevated temperatures.
With CAS No. 68478-92-2 and EINECS No. 270-844-4, IOTA 8152-8154 is developed for silicone formulations that require a longer processing or storage window without sacrificing high-temperature curing efficiency.
Unlike conventional platinum catalysts that may trigger premature crosslinking in certain formulations, IOTA 8152-8154 helps manufacturers achieve a balance between delayed curing and efficient thermal activation.
1. Extended Delayed Curing Performance
One of the main advantages of IOTA 8152-8154 is its long-lasting delayed curing performance. In suitable addition-cure silicone formulations without additional inhibitors, the system can remain uncured for approximately 3–6 months at room temperature (20–25°C).
This feature provides greater flexibility for the preparation, storage, and handling of one-component silicone formulations.
2. Excellent High-Temperature Activation
IOTA 8152-8154 is designed to maintain delayed curing behavior under moderate-temperature conditions while enabling rapid curing at elevated temperatures.
Typical performance described for suitable formulations includes:
20–25°C: Approximately 3–6 months without curing.
90–100°C: Several hours of delayed curing.
140–180°C and above: Rapid and complete curing can be achieved.
Actual curing behavior depends on the silicone formulation, catalyst concentration, Si-H/vinyl ratio, and processing conditions.
3. Suitable for One-Component Addition-Cure Silicone Systems
The catalyst is particularly suitable for applications where manufacturers need a longer working window and heat-triggered curing. It can help simplify processing and improve production flexibility in specially designed one-component addition-cure silicone formulations.
4. Alternative to Conventional Peroxide Curing Systems
For selected silicone rubber applications, platinum-catalyzed addition curing can provide an alternative to conventional peroxide vulcanization systems, such as DCP and DBPH.
Addition curing proceeds through hydrosilylation between Si-H and vinyl functional groups, without relying on peroxide decomposition. This makes it attractive for manufacturers seeking alternative curing technologies.
| Item | Description |
|---|---|
| Product Name | IOTA 8152-8154 |
| Product Type | Long-Lasting Delayed Platinum Catalyst |
| Chemical Name | Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex |
| Common Name | Karstedt Catalyst |
| CAS Number | 68478-92-2 |
| EINECS Number | 270-844-4 |
| Molecular Formula | C8H18OPtSi2 |
| Molecular Weight | 381.48 |
| Appearance | Colorless transparent liquid, sometimes slightly cloudy |
| Viscosity | 300–500 cP |
IOTA 8152-8154 provides different catalyst grades to meet varying requirements for delayed curing and thermal activation.
The GZ grade is a high-delayed-curing type designed to provide stronger latency and a higher curing temperature, making it suitable for formulations requiring a longer processing window before thermal activation.
Customers can select the appropriate grade according to their silicone formulation, processing temperature, and curing requirements.
IOTA 8152-8154 can be evaluated in various addition-cure silicone systems, including:
One-component addition-cure silicone rubber
Heat-curable silicone rubber formulations
Silicone molding and encapsulation materials
Industrial silicone elastomers
Special silicone compounds requiring delayed curing
Silicone systems requiring controlled thermal activation
For manufacturers developing one-component silicone products, this catalyst offers a potential solution to the challenge of balancing storage stability and fast production curing.
Platinum catalysts promote the hydrosilylation reaction between vinyl-functional polysiloxanes and hydrogen-containing silicone compounds.
During this reaction, Si-H groups react with vinyl groups to form Si-C bonds, creating a crosslinked silicone network.
IOTA 8152-8154 is designed to delay the onset of curing under suitable conditions and accelerate the crosslinking reaction at higher temperatures.
This temperature-dependent curing behavior allows manufacturers to optimize processing time, storage conditions, and production efficiency.
IOTA Silicone Oil (Anhui) Co., Ltd. specializes in silicone materials and functional silicone additives, providing solutions for silicone rubber, coatings, electronics, cosmetics, and other industrial applications.
Our product portfolio includes:
Platinum catalysts and silicone curing additives
Silicone oils and functional silicone fluids
Fumed silica and hydrophobic silica
Silicone resins and polysilazanes
We provide technical product information and application-oriented support to help customers select suitable silicone materials for their formulations.
Q1: What is IOTA 8152-8154?
IOTA 8152-8154 is a long-lasting delayed platinum catalyst based on a Karstedt-type platinum complex, developed for addition-cure silicone systems.
Q2: How long can IOTA 8152-8154 delay silicone curing?
Under suitable formulation conditions without additional inhibitors, the silicone system can remain uncured for approximately 3–6 months at 20–25°C. Actual results depend on the complete formulation and storage conditions.
Q3: At what temperature does IOTA 8152-8154 activate?
The catalyst is designed for delayed curing at moderate temperatures and rapid curing at approximately 140–180°C or above, depending on the formulation.
Q4: Can IOTA 8152-8154 replace peroxide curing agents?
It can be evaluated as an alternative to peroxide curing systems in selected silicone rubber applications. However, the formulation and curing process need to be redesigned for platinum-catalyzed addition curing.
Q5: What is the difference between the standard grade and GZ grade?
The GZ grade is designed for stronger delayed curing performance and a higher curing temperature, making it suitable for applications requiring greater thermal latency.
Looking for a reliable delayed platinum catalyst for one-component addition-cure silicone rubber?
IOTA Silicone Oil provides IOTA 8152-8154 and other functional silicone additives for industrial formulation development.
Contact our technical sales team for product specifications, TDS, samples, and customized application recommendations.
Website: https://ethylsilicone.com
Email: sales15@siliconeoil.net
Company: IOTA Silicone Oil (Anhui) Co., Ltd.
Contact us today to discuss your delayed platinum catalyst requirements.
