Place of Origin:
China
Brand Name:
CHENGUANG FSP
Certification:
ISO / SGS
Model Number:
R-629
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Vacuum Interrupter Potting Silicone Rubber
20% Dielectric Strength Low Viscosity R627 Vacuum Interrupter Potting Silicone Rubber
DESCRIPTION
Characteristics:
This material boasts exceptional moisture-proof and aging-resistant properties, making it an excellent insulator. Additionally, it has a low viscosity and excellent fluidity, allowing for easy application. It also provides strong adhesion to substrates when used with a matched primer.
Typical Properties
Properties | Test Method | Unit | R-629 | ||
Uncured | Appearance | Visual | A | Translucent | |
B | Transparent | ||||
Viscosity, after stirred at 23°C | GB/T 2794-1995 | Pa.s | 50 | ||
Mixing ratio | A:B | 10:1 | |||
Pot life, 25°C | h | 8 | |||
Cured | Tensile strength | GB/T 528-2009 | MPa | 6.0 | |
Elongation at break | GB/T 528-2009 | % | 400 | ||
Tear strength | GB/T 529-2008 | kN/m | 15 | ||
Hardness, Shore A | GB/T 531-1999 | 35±5 | |||
Dielectric strength | GB/T 1408.1-2006 | MV/m | 20 | ||
Volume resistivity | GB/T 1410-2006 | Ω.cm |
1.0×1013
|
These figures are only intended as a guide and should not be used in preparing specifications.
How to Use
The weight mixing ratio for this material is 10:1. Both Group A and Group B components are supplied from the machine's attached storage section and are mixed through a static mixer before being injected into the mold. The pot life of the material is 8 hours at 25℃ after being mixed, but higher temperatures may reduce it.
When using manual or semi-mechanical methods, it is recommended to use specialized equipment such as a small planetary mixer for complete mixing. Be careful when stirring manually and avoid scratching the bottom and walls of the container. To ensure that there are no air bubbles in the cured rubber, place the mixture in a vacuum degassing tank along with its container. The mixture will automatically break bubbles to collapse and rise to 3-4 times higher than the original location. Keep the vacuum status for at least 4-6 minutes before releasing.
If the injection molding equipment will not be used for an extended period, clean any remaining rubber promptly or store them in sealed packaging at low temperatures (-10℃ at least).
Curing Conditions
Heat acceleration can be used for vulcanization. The curing time is dependent on the size of the mold.
For larger molds, it's important to take into account the necessary time for thermal conduction. Additionally, the cooling and demolding time will vary based on the size of the article as well as the curing temperature.
Packing, Storage & Shipping
The rubber base is packaged in a 20kg plastic drum with a net weight. The curing agent is provided separately in a plastic bottle or drum.
If stored in the original sealed container between 0℃ and 30℃, the product has a shelf life of at least 6 months.
Exceeding the specified storage time does not necessarily mean that the product is no longer usable. In such cases, it's important to check the required properties for the intended use for quality assurance purposes.
There are no restrictions on shipping.
Compatibility
The cure of the product may be restrained by specific materials, chemicals, curing agents, and plasticizers. The most significant of these are:
- Organotin and other organometallic compounds.
- Organotin catalyst present in silicone rubber.
- Sulfur, polysulfides, polysulfones, or other materials containing sulfur.
- Amines, urethanes, or materials containing amines.
- Plasticizers having unsaturated hydrocarbon.
- Certain solder flux residues.
To determine if a substrate or material has the potential to inhibit cure, it is advisable to perform a small-scale compatibility test to assess its suitability for a specific application. If there is liquid or uncured product at the interface between the cured gel and the questionable substrate, it indicates that there is incompatibility and inhibition of cure.
Over the years, it has been confirmed that components belonging to both group A and group B do not contain any toxic or aggressive substances. Therefore, there is no requirement for special preventive measures, and the general industrial health standards should be followed.
To prevent inactivation, it is advisable to avoid contact with nitrogen, phosphorus, sulfur compounds, organic tin, or other heavy metal compounds. Additionally, it is important to keep the containers clean.
The pot life of mixed rubber is affected by temperature, with higher temperatures resulting in shorter pot life.
The information presented in this leaflet represents our current knowledge. However, it is essential for the user to thoroughly inspect all supplies upon receipt. We reserve the right to modify product specifications based on technical advancements or new developments. Since we have no control over processing conditions, especially when utilizing raw materials from other companies, it is recommended to conduct preliminary trials to validate the suggestions provided in this leaflet. These recommendations do not absolve the user of the responsibility of investigating any potential infringement of third-party rights or clarifying their position when required. The recommendations offered do not imply any warranty, whether expressed or implied, regarding the fitness or suitability of the products for a specific purpose.
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