Description of Silicone Rubber Gaskets for Glass Jars
Key advantages
Silicone rubber gaskets for glass jars offer several unique advantages compared to other types of gaskets:
- Heat Resistance: Silicone rubber has high heat resistance and is suitable for sealing glass jars used for canning or storing hot liquids. It can withstand temperatures from -40°C to 230°C (-40°F to 446°F) without losing sealing properties or deforming.
- Flexibility and Elasticity: Silicone rubber gaskets are known for their excellent flexibility and elasticity. This allows them to create a tight seal between the lid and jar, preventing air or liquid from entering or escaping. The gasket stretches and compresses easily to ensure a tight fit.
- Chemical Resistance: Silicone rubber has excellent resistance to a wide range of chemicals, including acids, bases, and solvents. This makes it suitable for sealing glass jars containing a variety of liquids, such as oils, sauces, and pickled foods. The gasket will not react with the contents of the jar, ensuring the integrity and safety of stored items.
- Durability: Silicone rubber gaskets are extremely durable and long-lasting. They are resistant to degradation caused by exposure to UV rays, moisture, and extreme temperatures, meaning they maintain their sealing properties over a longer period. This durability makes them ideal for repeated use in canning and food storage applications.
- Nontoxic and food-grade: Silicone rubber is considered safe for food contact and is approved by regulatory agencies such as the U.S. Food and Drug Administration (FDA). It does not release harmful substances into stored food or chemically react with it. Therefore, silicone gaskets are a popular choice for sealing glass jars used for food preservation.
- Easy to clean: Silicone rubber gaskets are nonporous and stain-resistant, making them easy to clean. They can be washed with soap and water or placed in the dishwasher without losing their integrity. This is especially beneficial for maintaining hygiene when using glass jars to store perishable or sensitive items.
Overall, silicone gaskets provide a reliable seal, heat resistance, chemical resistance, and durability, making them the first choice for sealing glass jars in a variety of applications, including food storage, canning, and preservation.
Applicable working conditions
Silicone rubber gaskets are suitable for the sealing needs of various glass jars, especially in the following working conditions:
■ High-temperature environments: Silicone rubber gaskets can withstand high temperatures, making them ideal for canning or storing hot liquids. They maintain sealing performance over a temperature range of -40°C to 230°C (-40°F to 446°F) without losing elasticity or deformation.
■ Acid and alkali environment: Silicone rubber gaskets for glass jars have excellent acid and alkali resistance and can resist the erosion of various chemical substances, including acids, alkalis, and solvents. Therefore, they are ideal for sealing glass jars containing a variety of liquids, such as oils, sauces, and pickled foods. The gasket will not react with the contents of the tank, ensuring the integrity and safety of stored items.
■ Flexibility and elasticity: Silicone rubber gaskets have excellent flexibility and elasticity, creating a tight seal between the jar mouth and lid. They can be stretched and compressed easily to ensure a snug fit. This is important to keep air and liquid out of the tank.
■ Food contact safety: Silicone rubber is considered food contact safe and meets the approval of regulatory agencies such as the U.S. Food and Drug Administration (FDA). It does not release harmful substances into stored food or chemically react with food. Therefore, silicone rubber gaskets are the preferred choice in food storage and canning applications.
■ Durability: Silicone rubber gaskets offer excellent durability and long life. They are resistant to degradation caused by UV rays, moisture, and extreme temperatures, so they maintain their sealing properties over a longer period. This durability makes them ideal for repeated use in canning and food storage applications.
Physical property information
| Physical Properties | Rating (Metric) | Rating (Imperial) | Test Method |
| Density | 0.980 - 1.00 g/cc | 0.0354 - 0.0361 lb/in³ | ASTM D297 |
| Saturated water absorption | <= 0.30 % | <= 0.30 % | By Thermogravimetry |
| Mechanical Properties | Rating (Metric) | Rating (Imperial) | Test Methods |
| Hardness (Shore A) | 45 - 60 | 45 - 60 | DIN 53505 |
| Tensile strength (breaking) | 4.50 - 6.00 MPa | 653 - 870 psi | DIN 53504 S2 |
| Tensile Strength (Yield) | 4.14 MPa | 600 psi | @50% Elongation; ASTM D1414 |
| Elongation (break) | >= 400 % | >= 400 % | DIN 53504 S2 |
| 50% Modulus | 0.000800 - 0.00150 GPa | 0.116 - 0.218 ksi | DIN 53504 S2 |
| 100% Modulus | 0.00120 - 0.00200 GPa | 0.174 - 0.290 ksi | DIN 53504 S2 |
| Tear strength | 25.0 - 30.0 kN/m | 143 - 171 pli | Die B; ASTM 624 |
| Permanent compression | 75% | 75% | 23°C; ISO 815 |
| Thermal Performance | Rating (Metric) | Rating (Imperial) | Test Method |
| Specific Heat Capacity | 1.50 - 1.60 J/g-°C | 0.359 - 0.382 BTU/lb-°F | DSC |
| Machinability | Rating (Metric) | Rating (Imperial) | Test Method |
| Processing temperature | 185 - 230 °C | 365 - 446 °F | Metering Zone |
| Feed temperature | 30.0 °C | 86.0 °F | |
| Mold temperature | 20.0 - 40.0 °C | 68.0 - 104 °F |
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