Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex

Basic Information of Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex

CAS No.	68478-92-2
EC No.	270-705-7
Chemical Formula	C₈H₂₄O₂Si₃Pt (complex); typically supplied in xylene solution
Molecular Weight	381.64 g/mol (complex); Pt content 2–3% w/w in solution
Appearance	Clear to pale yellow liquid (xylene solution)
Odor	Xylene-like (solvent)
Melting point	Not applicable (solution)
Boiling point	~138–140 °C (xylene solvent)
Density	approx. 0.88–0.92 g/mL (2–3% Pt solution at 20 °C)
Solubility	Miscible with hydrocarbons, silicone oils, toluene; insoluble in water
Nature (hazards)	Flammable liquid (xylene solvent), harmful if swallowed or inhaled, may cause long lasting harmful effects to aquatic life
RIDADR	UN 1307, Xylenes, Class 3, Packing Group III (solution)
Chemical Structure

Primary Applications of Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex

Karstedt's catalyst remains the industry gold standard for platinum-catalyzed hydrosilylation and silicone curing due to its unmatched activity and selectivity.

1. Addition-Cure Silicone Elastomers & Rubbers
   Catalyzes rapid cross-linking of vinyl-functional silicones with Si–H containing cross-linkers at room temperature, essential for LSR (liquid silicone rubber), RTV silicones, and high-performance elastomers.

2. Hydrosilylation of Alkenes & Alkynes
   Enables efficient Si–H addition to unsaturated bonds under mild conditions, providing selective routes to organosilicon compounds in fine chemicals and specialty silicones.

3. Silicone Release Coatings & Adhesives
   Used in paper release liners, pressure-sensitive adhesives, and conformal coatings where fast, tack-free curing is required.

4. Functional Silicone Fluids & Resins
   Facilitates grafting of Si–H functional fluids onto vinyl-containing molecules for modified silicone oils, resins, and copolymers.

5. Industrial & Medical-Grade Silicones
   Widely applied in medical tubing, implants, seals, and prosthetics due to its high catalytic efficiency and low platinum loading requirements.

6. Catalyst Development & Mechanistic Studies
   Serves as the benchmark Pt(0) source for ligand modification, inhibitor studies, and development of next-generation platinum catalysts in silicone R&D.

• Precise Platinum Content Control
  Accurate Pt assay and low residual impurities guarantee uniform concentration and reproducible curing performance across batches.

• Secure Precious Metal Sourcing
  Transparent, responsible platinum procurement with inventory buffering to provide supply stability and competitive pricing.

• Technical Silicone Support
  Dedicated specialists offer guidance on formulation, inhibitor selection, inhibitor delay, curing optimization, and scale-up for maximum efficiency.

• Full Regulatory Compliance
  Comprehensive COA, REACH, RoHS, and detailed SDS documentation to facilitate seamless integration into silicone manufacturing and audits.

• Sustainability & Recycling Programs
  Ethical sourcing practices and platinum recovery/recycling programs aligned with ESG objectives and sustainable silicone production.

Hazards Classification

• GHS Classification: Flammable Liquids (Category 3); Acute Toxicity, Oral (Category 4); Acute Toxicity, Inhalation (Category 4); Aquatic Chronic (Category 3)

• Hazard Statements: H226: Flammable liquid and vapor; H302 + H332: Harmful if swallowed or if inhaled; H413: May cause long lasting harmful effects to aquatic life

• UN Number: UN 1307 (xylene solution)

• Hazard Class: 3 (Flammable liquids)

• Packing Group: III