Knowde Enhanced TDS
Identification & Functionality
- Catalyst Active Site
- CASE Ingredients Functions
- Industrial Additives Functions
Features & Benefits
- Labeling Claims
- CASE Ingredients Features
- Industrial Additives Features
- Specific Features
- Catalyst
- Solvent-free
Applications & Uses
- Applications
- Compatible Polymers & Resins
- Compatible Substrates & Surfaces
- Cure Method
- Applications
Release Coatings
- Application Details
WACKER® CATALYST PT 5 is dissolved in a reactive silicone polymer, which is incorporated into the cured rubber during the curing process. Combined with DEHESIVE® silicone polymers, it is excellently suited for providing various substrates, such as paper and films, with a silicone coating that exhibits release properties towards tacky products used in technical, health, hygiene and food sectors.
Processing
- WACKER® CATALYST PT 5 must be added to the mixture of DEHESIVE® , CRA® modifier and crosslinker. During addition, stirring should be as rapid as possible to avoid local over-concentrations of the platinum catalyst, which cause premature curing indicated by the formation of gel particles ranging in color from brown to black.
- It is also important that the platinum catalyst is always added as the last component to the homogeneous mixture of polymer and crosslinker. Suitable materials for mixing vessels, stirrers, pumps, tubes, filters, etc. are stainless steel, polyethylene, polypropylene, Teflon and other fluorine polymers, as well as products coated or lined with these materials.
- If good catalyst activity is to be maintained, it is essential to avoid deactivation of the platinum catalyst. This may occur as a result of contact with the above mentioned equipment, with the ambient air, with unsuitable rolls in the coating equipment, with the customer's additives, or even with the substrate to be coated.
- If heavy metals (e.g. lead, copper, zinc, iron, chromium or tin) or sulfurous, nitrogenous or phosphorous organic compounds are present in any of the above materials, curing may be impaired or even prevented.
Properties
- Physical Form
- Appearance
- Clear to slightly turbid oily liquid
- Typical Properties
- Properties
- Very high and constant catalyst activity
- Medium platinum concentration
- Rapid curing of addition-crosslinking silicone systems
- Miscible with silicones in all proportions
| Value | Units | Test Method / Conditions | |
| Density (at 20°C) | 0.97 | g/cm³ | DIN 51757 |
| Dynamic Viscosity (at 25°C) | approx. 550 | mPa·s | — |
| Platinum Content | 5000 | ppm | — |
Safety & Health
- Safety Notes
Platinum catalysts react vigorously with proton donors. Undiluted catalysts should therefore not come into direct contact with siloxane crosslinkers, since this may cause a spontaneous, uncontrolled liberation of hydrogen. Especially in the presence of reactive organic solvents (e.g. esters and ketones) and flammable materials with a large surface area (e.g. paper), spontaneous ignition may then occur.
Packaging & Availability
- Country Availability
- Regional Availability
Storage & Handling
- Storage Information
Prolonged exposure to air and light, especially UV light, may result in an increased brown discoloration, or development of turbidity. Since the colloidal platinum formed is also catalytically active, it is safe to assume that a brown discoloration and slight turbidity will not have a detrimental effect on the performance of the product.