Knowde Enhanced TDS
Identification & Functionality
- Additives Included
- Chemical Family
- Polymer Name
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Materials Features
- Special Features
- Addition Curing
- Food-contact
- Low compression set
- Two-component
Applications & Uses
- Cure Method
- Plastics & Elastomers Processing Methods
- Applications
- Baby Care
- Dairy & Food Applications
- Sanitary
- Profiles & Tubings
- Application Details
ELASTOSIL® R plus 4305/40 is suited for the manufacture of extruded articles. Properly cured and post-cured vulcanizates of ELASTOSIL® R plus 4305/40 can be used for food contact applications and are suitable for use under the Recommendation "XV. Silicones" of the BfR and FDA 21 CFR 177.2600 "Rubber Articles Intended for Repeated Use" considering any given limitations on extractable and volatile substances.
Processing
- ELASTOSIL® R plus 4305 series may not be cured with peroxides but only with the platinum catalyst batch ELASTOSIL® AUX Batch PT 1. ELASTOSIL® R plus 4305/40 and ELASTOSIL® AUX Batch PT 1 are mixed homogeneously on a roll mill in a ratio of 100:1.5. A higher catalyst dosage results in a faster curing but a reduced pot life. Care must be taken to keep the compound cool during mixing.
- A homogeneous incorporation is a must, but the temperature of the rubber should not exceed 30 °C, otherwise there is a risk of scorch.
- The cross linking reaction starts as soon as ELASTOSIL® AUX Batch PT 1 has been added. The rate and degree of crosslinking is dependent on storage time and temperature. At 23 °C the pot life is approximately 24 h. This can be extended by storing the catalyzed mixture at lower temperature.
Properties
- Typical Properties
- Cured Properties
- Properties
ELASTOSIL® R plus 4305/40 is a fast curing silicone rubber exhibiting good to very good mechanical properties. Thanks to addition cure, the vulcanization reaction is significantly faster compared to peroxide curing materials. No peroxide decomposition products are formed during vulcanization. At service temperatures above approx. 180 °C the addition of heat stabilizers is recommended.
- Note
Cure conditions: 1.5 parts ELASTOSIL AUX Batch PT 1, 15 min / 165 °C in press, post-cured 4 h / 200 °C for cured properties.
| Value | Units | Test Method / Conditions | |
| Pot Life (at 23°C) | 24 | Hours | — |
| Value | Units | Test Method / Conditions | |
| Compression Set (at 22 hours, 175°C) | 7 | % | DIN ISO 815-1 type B method A |
| Density | 1.12 | g/cm³ | DIN EN ISO 1183-1 A |
| Elongation (at break) | 830 | % | ISO 37 Type 1 |
| Rebound Resilience | 56 | % | ISO 4662 |
| Shore Hardness A | 40 | — | DIN ISO 48-4 |
| Tear Strength | 27 | N/mm | ASTM D 624 B |
| Tensile Strength | 9.8 | N/mm² | ISO 37 Type 1 |
Regulatory & Compliance
- Certifications & Compliance
Packaging & Availability
- Country Availability
- Regional Availability