Karstedt Platinum Complex Catalyst (Transparent High Activity)
1. Product Overview
Karstedt Platinum Catalyst is zero-valent platinum divinyltetramethyldisiloxane complex with CAS No. 68478-92-2, a high-end hydrosilylation curing agent exclusively for addition-type silicone systems. It is a crystal clear and colorless liquid with ultra-strong catalytic activity, specially developed for manufacturing high-transparency, food-grade and medical-grade silicone products.
Compared with traditional chloroplatinic acid isopropanol platinum water, our Karstedt complex platinum eliminates yellow discoloration after curing and maintains long-term permanent transparency of silicone finished goods. It features excellent anti-poisoning performance and fast low-temperature curing speed, perfectly matching premium silicone products with strict requirements on surface transparency and appearance.
2.Technical Specifications
| Test Item | Standard Index |
|---|---|
| Chemical Name | Platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex |
| CAS Number | 68478-92-2 |
| Appearance | Clear, colorless transparent liquid |
| Viscosity (25℃) | 400–900 mPa·s, customizable |
| Platinum Concentration | 1000ppm / 2000ppm / 3000ppm / 5000ppm / 10000ppm / 20000ppm (customizable) |
| Specific Gravity (25℃) | 0.90–1.10 g/cm³ |
| Solubility | Fully miscible with vinyl silicone oil; insoluble in water |
| Recommended Addition Dosage | 0.05%–0.5% of total silicone compound weight |
| Applicable Curing Temperature | 60℃–150℃, supports low-temperature fast curing |
| Unopened Shelf Life | 12 months |
3.Key Performance Features
- Ultra-high catalytic activity, enabling rapid crosslinking at low temperature to shorten production cycles and boost productivity.
- Zero yellowing reaction by-products, keeping silicone products highly transparent without yellowing or darkening permanently.
- Outstanding anti-poisoning tolerance, hardly deactivated by trace impurities including sulfur, nitrogen and phosphorus substances.
- Stable chemical property with evenly dispersed platinum components, no sediment generation and consistent curing effect across batches.
- Wide compatibility, fully miscible with all vinyl silicone rubber, liquid silicone, hydrogen-containing silicone oil and silicone resin.
- Odor-free and eco-friendly; no toxic volatile by-products released during curing, compliant with food contact and medical material standards.
Low required dosage, no negative impact on silicone’s mechanical and optical properties after addition.
4. Core Competitive Advantages
4.1 Permanent High Transparency, No Yellow Discoloration (Core Selling Point)
Conventional chloroplatinic acid isopropanol platinum water will turn silicone yellow and dim after curing and long-term storage. Our transparent Karstedt platinum complex completely solves the yellowing problem, ideal for transparent baby silicone goods, optical silicone, clear mold silicone and cosmetic silicone accessories.
4.2 Higher Activity, Lower Comprehensive Production Cost
It delivers much faster curing speed under the same temperature than old-fashioned platinum water. Less catalyst consumption and lower heating energy cost help factories cut overall formula and production expenses.
4.3 Strong Anti-Poisoning Capacity for Stable Mass Production
It resists interference from fillers, release agents and tiny foreign impurities, effectively avoiding defective products with sticky surface or incomplete curing during continuous molding, extrusion and automated production.
4.4 Acid-Free Residue, Safe for Medical & Food-Grade Applications
Different from chloroplatinic acid system with acid content, our product contains no corrosive acid residues, passing food contact safety and biocompatibility tests, safe for infant supplies and medical silicone devices.
4.5 Customizable Platinum Content & Viscosity
Platinum concentration and liquid viscosity can be tailored according to customers’ unique silicone formulas, compatible with both one-component and two-component silicone systems.
4.6 Wide Adaptability to Multiple Manufacturing Processes
Suitable for LSR liquid silicone injection molding, solid silicone compression molding, extrusion, silicone coating, silicone ink, electronic potting gel, room-temperature curing and high-speed automated production lines.
5. Wide Application Fields
- Medical Grade Silicone: Silicone catheters, breathing masks, medical sealing gaskets, auxiliary implant silicone parts
- Food Contact Silicone: Baby nipples, feeding accessories, baking mats, food molds, kitchen silicone utensils
- LSR Liquid Silicone Injection Molding: Electronic waterproof seals, watch bands, transparent consumer electronic components
- Silicone Gel & Electronic Potting Compound: LED transparent encapsulant, thermal conductive silicone gel, electronic module potting glue
- Silicone Ink & Release Coating: Screen printing silicone ink, PET protective film silicone release layer
- Transparent Mold Silicone: Craft duplicate molds, jewelry casting silicone, transparent art mold materials
- Modified Silicone Oil Synthesis: Polyether-modified silicone oil, amino silicone oil, textile softener raw materials
Addition-Type Solid Silicone: Extruded silicone tubes, silicone sheets, high-temperature transparent silicone rollers
6. Packaging Specifications
Standard In-Stock Packages
- Lab Test Samples: 100g / 250g transparent plastic bottles with double airtight caps
- Small & Medium Batch Production: 1kg / 5kg HDPE plastic jerrycans
- Large Industrial Bulk Shipment: 25L HDPE plastic drums, 200L plastic-lined iron barrels
Custom Packaging Service
- Custom private brand labels & stickers on all packages
- Standard export pallet packaging with stretch film and anti-collision corners for sea transportation
- Free small test samples available for formula verification
All containers are fully sealed to prevent activity loss during transit
7. Storage & Transportation Guidelines
- Storage Conditions: Keep tightly sealed, store in cool, dry and dark warehouses at 10–30℃; stay away from direct sunlight and heat sources.
- Forbidden Contact Materials: Separate from sulfur, phosphorus, nitrogen, tin, lead and mercury compounds, which will cause platinum catalyst poisoning and failure.
- Transport Classification: Class 3 flammable liquid; comply with IMDG sea shipping and IATA air freight regulations.
8. Operation Precautions
- Recommended operation sequence: Mix catalyst evenly into vinyl silicone base before adding hydrogen-containing silicone oil.
- Never blend with sulfur-based vulcanizing agents, tin catalysts or amine additives, otherwise curing failure will occur.
- Wear protective gloves and goggles during operation; flush skin or eyes with plenty of clean water immediately in case of splashing.
- Store separately from peroxide curing agents; mixed storage is prohibited.
Add matched curing inhibitor for long pot life if you adopt low-viscosity silicone formulas.
- Hi, Winstar Silicone company, we are interested in your product silicone color masterbatch, could you please offer some free samples to us？ Our company address: ***LA,USA
- Hello Winstar, our product is compression molding product,could you advise which peroxide curing agent to use ?
- Hi friend, we have some problem in silicone to PVC bonding, that bonding strength is not well at all, how to improve it please ?
Please Feel free to give your inquiry in the form below.We will reply you in 24 hours.
