Hey there! As a supplier of EPDM sealing strips, I often get asked about how the hardness of these strips changes over time. So, I thought I’d dive into this topic and share some insights with you all. EPDM Sealing Strips
First things first, let’s quickly go over what EPDM is. EPDM stands for Ethylene Propylene Diene Monomer, which is a type of synthetic rubber. It’s super popular for sealing strips because it’s got some amazing properties. It’s resistant to weathering, ozone, and UV rays. It can also handle a wide range of temperatures, from really cold to pretty hot. These features make it a go – to choice for all sorts of applications, like in doors, windows, automobiles, and even industrial equipment.
Now, the hardness of EPDM sealing strips is usually measured on the Shore A scale. This scale goes from very soft (around 20 Shore A) to quite hard (around 90 Shore A). Most of the EPDM sealing strips we supply fall in the range of 40 – 70 Shore A. The initial hardness is carefully chosen based on the specific application. For example, if it’s for a window seal where a bit of flexibility is needed to fit snugly, we might go for a lower hardness value. On the other hand, for an industrial application where more rigidity is required, a higher hardness might be the way to go.
But what about how the hardness changes over time? Well, there are a few factors at play here.
One of the major factors is heat. EPDM is generally good at handling heat, but over long periods of exposure to high temperatures, it can start to change. When EPDM is exposed to heat, the polymer chains in the rubber start to break down. This breakdown can cause the rubber to become stiffer, which means an increase in hardness. For instance, if you have an EPDM seal in an engine compartment of a car, where the temperature can get quite high, you might notice that over a few years, the seal becomes harder. In some cases, if the temperature is extremely high and the exposure is prolonged, the seal can become so hard that it loses its ability to seal properly, leading to leaks.
Another factor is exposure to chemicals. EPDM is resistant to a lot of chemicals, but some aggressive chemicals can still have an impact on it. For example, certain solvents or acids can react with the EPDM material. When this happens, the chemical reaction can alter the structure of the rubber. This can either cause the rubber to swell or shrink, and in both cases, it can lead to a change in hardness. If the rubber swells, it might become softer as the molecules are more spaced out. But if it shrinks due to a chemical reaction, it can become harder because the molecules are more tightly packed together.
Ozone exposure is also a big deal. Ozone is a highly reactive gas that’s present in the atmosphere, especially in areas with high levels of pollution or near electrical equipment that generates ozone. When EPDM is exposed to ozone, it can cause the rubber to crack on the surface. As these cracks form and expand, the rubber becomes less flexible and harder. This is a common problem for outdoor EPDM seals, like those on the exterior of buildings. Over time, the ozone in the air can take its toll on the seals, making them less effective.
UV radiation is yet another factor. The sun’s UV rays can break down the chemical bonds in EPDM. This is similar to the effect of heat, but it’s more of a surface – level degradation. The outer layer of the EPDM seal can become brittle and harder due to UV exposure. This can lead to the surface cracking and peeling, which not only affects the appearance of the seal but also its performance.
Moisture can also play a role. While EPDM is water – resistant, long – term exposure to water or high humidity levels can cause some changes. In some cases, water can seep into the rubber and cause it to swell slightly. This initial swelling might make the seal a bit softer. But if the water contains certain minerals or salts, over time, these can react with the EPDM and lead to hardening.
So, how can we try to predict or control these hardness changes? Well, first of all, we do a lot of testing in our lab. We expose samples of our EPDM sealing strips to different environmental conditions, like high heat, chemicals, ozone, and UV radiation. We measure the hardness at regular intervals to see how it changes over time. This helps us to develop seals that are more resistant to these factors.
For example, we can add certain additives to the EPDM during the manufacturing process. These additives can help to protect the rubber from heat, ozone, and UV radiation. They act as stabilizers and antioxidants, preventing the polymer chains from breaking down as quickly.
We also provide guidelines to our customers on how to install and maintain the EPDM sealing strips. Proper installation is crucial. If the seal is installed too tightly or too loosely, it can be more prone to damage and hardness changes. And regular maintenance, like cleaning the seals with mild soaps and checking for any signs of wear, can help to extend their lifespan.
Now, let’s talk about why all this matters. The hardness change of EPDM sealing strips can have a huge impact on their performance. If a seal becomes too hard, it might not be able to conform to the surfaces it’s supposed to seal. This can lead to leaks, which can be a big problem in applications like buildings (where it can cause water damage) or automobiles (where it can lead to engine problems). On the other hand, if a seal becomes too soft, it might not provide enough resistance and can be easily damaged.
So, if you’re in the market for EPDM sealing strips, it’s important to choose a supplier who understands these issues and can provide high – quality products. That’s where we come in! We’ve been in the business for a long time, and we’ve got the knowledge and experience to supply you with EPDM sealing strips that are designed to last. We can work with you to figure out the right hardness for your specific application and make sure that the seals are as resistant as possible to the environmental factors that can cause hardness changes.
If you have any questions about our EPDM sealing strips or want to discuss a potential purchase, don’t hesitate to reach out. We’re always happy to have a chat and see how we can help you with your sealing needs. Whether it’s for a small DIY project or a large industrial application, we’ve got the products and the expertise to meet your requirements. So, let’s get the ball rolling and start a conversation about how we can provide you with the best EPDM sealing strips in the market.
Pile Weather Strip References:
- "Handbook of Elastomers" by I. I. Rubin
- "Rubber Technology: Compounding, Testing, and Applications" by Michael B. Rodgers
- Various industry research papers on EPDM rubber and its properties.
Hangzhou Zoinen Sealing Technology Limited
As one of the leading epdm sealing strips manufacturers and suppliers in China, we warmly welcome you to wholesale cheap epdm sealing strips made in China here from our factory. All customized products are with high quality and competitive price.
Address: Room 707, Eastern Building No.1, Zichuang Business Center, Xihu District, Hangzhou, Zhejiang, China.
E-mail: talia@zoinen.com
WebSite: https://www.zoinen.com/
