What is the platinum content and addition ratio for platinum curing agents in liquid silicone rubber?
The platinum content and addition ratio of platinum curing agents in liquid silicone rubber vary depending on the specific product and application.
The platinum content in platinum curing agents typically ranges from 1,000 ppm to 20,000 ppm. For example, when tetramethyldivinyldisiloxane chloroplatinate complex is used as a platinum catalyst, the platinum content is generally 3,000-5,000 ppm.
In terms of addition ratio, when formulating premixed compounds such as liquid silicone rubber and electronic potting compounds, platinum curing agents are generally added at a rate of 2.0-8.0 ppm based on the total weight. For materials such as silicone release agents and pressure-sensitive adhesives, the addition level is typically 100-150 ppm. For two-component addition-type liquid silicone rubber, the typical curing ratio is 1:1 (by weight), with some grades using a 10:1 ratio. In some cases, the platinum curing agent is added at a ratio of about 1.2% relative to 100% solid content of silicone.
