Why Does Silicone Sheet Become Hard After Prolonged High-Temperature Use?

Why Does Silicone Sheet Become Hard After Prolonged High-Temperature Use?

Silicone sheet is known for its good high-temperature resistance and is widely used in various industrial applications. However, after prolonged exposure to high temperatures, some silicone sheets may gradually become harder, less elastic, and less flexible.

Why can silicone sheet still become hard after long-term high-temperature use even though silicone is known for its heat resistance?

The heat resistance of silicone sheet does not mean that the material will never age under high-temperature conditions.

 

What Conditions Can Accelerate Hardening?

One of the most common causes is long-term use above the suitable operating temperature.

When silicone sheet is continuously exposed to excessive heat, material aging can accelerate. The change may not be obvious at first, but after repeated use over a long period, the sheet may gradually lose elasticity and become harder.

In addition to temperature itself, long continuous operation and frequent temperature cycles can also affect long-term performance.

For example, silicone sheet may repeatedly go through heating, holding, and cooling cycles during operation. This repeated thermal cycling places continuous stress on the material. If the sheet is also subjected to compression, stretching, or bending, the accumulated effects may further contribute to material fatigue.

Therefore, when analyzing why a silicone sheet becomes hard, it is important to consider not only the equipment's set temperature, but also the actual working temperature, continuous operating time, and frequency of use.

Does Hardening Always Mean a Quality Problem?

Not necessarily.

If silicone sheet has been operating at elevated temperatures for a long period, some change in material properties over time does not automatically mean that the product has a quality problem.

The long-term performance of silicone sheet is influenced by several factors, including raw materials, formulation, curing process, hardness, and actual operating conditions.

If the working temperature, operating time, and product specifications are not properly matched, even a heat-resistant silicone sheet may experience accelerated aging.

For this reason, silicone sheet should not be selected based only on a single maximum temperature rating. The product should be matched to the actual working conditions.

How Can High-Temperature Hardening Be Reduced?

First, select silicone sheet according to the actual working temperature and avoid long-term operation beyond its suitable temperature range.

Second, consider the daily operating time. For applications involving continuous high-temperature operation, long-term heat resistance is more important than simply looking at a short-term maximum temperature rating.

It is also important to consider whether the silicone sheet is continuously subjected to compression, stretching, or bending during operation. When heat and mechanical stress occur at the same time, material aging and fatigue may become more significant.

Therefore, when purchasing silicone sheet, it is recommended to provide the supplier with key information such as working temperature, operating time, hardness, thickness, and actual working conditions. This allows the appropriate silicone sheet to be selected more accurately.

How Does DIAO Focus on Long-Term Silicone Sheet Performance?

Hebei Diao Rubber Products Co., Ltd. controls raw materials, hardness, thickness, and manufacturing processes according to the requirements of different silicone sheet applications.

Silicone sheets used for different applications are not necessarily the same product. Therefore, DIAO matches the silicone sheet according to the customer's working temperature, equipment conditions, dimensions, and performance requirements, rather than using one type of silicone sheet for every application.

For silicone sheets used under prolonged high-temperature conditions, appropriate material selection and consistent manufacturing processes are important for maintaining flexibility, resilience, and long-term performance.