Karstedt Catalyst PT-5000 – Universal Platinum Catalyst for Liquid Silicone Rubber & Silicone Ink

Product Overview for Karstedt Catalyst
PT-5000 is a highly efficient Karstedt-type platinum catalyst designed for hydrosilylation reactions. It enables rapid, low-temperature curing without chloride residues, ensuring high transparency and stability. Ideal for a wide range of silicone formulations, including liquid silicone rubber, pressure-sensitive adhesives, flame-retardant compounds, and silicone inks.

Product Features for Karstedt Catalyst

Zero oxidation state platinum, chloride-free

Promotes fast crosslinking between Si-Vi and Si-H groups

High activity at ambient temperatures

Excellent transparency and color stability

Minimizes side reactions and prevents blackening/yellowing

Product Parameters for Karstedt Catalyst

Platinum content: 3000–5000 ppm

Appearance: Clear to pale yellow liquid

Solubility: Compatible with most silicone oils and polymers

Storage stability: >12 months at room temperature in sealed container

Applications for Karstedt Catalyst

Liquid silicone rubber (LSR)

Pressure-sensitive silicone rubber

Flame-retardant silicone compounds

Silicone inks for printing and coating

Two-part RTV silicone systems

Operating Guidelines for Karstedt Catalyst

Recommended dosage: 0.1–1.0% of total silicone weight

Mix thoroughly with Part A before adding Part B (Si-H component)

Cure temperature: 25–120°C, adjustable based on system requirements

Avoid contact with sulfur, amines, and tin compounds

Precautions for Karstedt Catalyst

Use in well-ventilated areas

Wear gloves and protective eyewear

Avoid exposure to moisture before curing

Store away from heat and direct sunlight

Packaging & Storage for Karstedt Catalyst

Available in 1 kg, 5 kg, 25 kg sealed aluminum bottles or customized packaging

Store in cool, dry place (15–25°C)

Keep container tightly closed

FAQ for Karstedt Catalyst

What is the typical curing time with PT-5000?

At room temperature, full cure is achieved within 2–4 hours depending on formulation.

Can PT-5000 be used for food-contact applications?

Yes, it complies with relevant FDA and EU regulations for indirect food contact.

Does it require an inhibitor?

No, PT-5000 is inhibitor-free and offers stable curing behavior.

Is it compatible with other platinum catalysts?

We recommend consulting our technical team before blending with other catalyst systems.

What is the shelf life?

12 months when stored properly in original unopened packaging.