Tag Archives: Quality Control

How Do You Test Rubber Components for Quality and Durability?

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Many industries rely on rubber components, from automotive and aerospace to construction, medical devices, and industrial manufacturing. Products such as specialty seals, gaskets, O-rings, bushings, hoses, and vibration dampeners must withstand demanding environments while maintaining their performance over time. Even just a minor defect can result in leaks, equipment failure, or costly downtime. This is why rigorous quality and durability testing should be implemented as an essential part of rubber products manufacturing.

How do you test rubber components for quality and durability? This is a very important question since testing ensures that they meet strict quality standards before reaching the customers.

How Do You Test Rubber Components for Quality and Durability?

Rubber components must be tested for quality and durability because they are exposed to a wide range of conditions such as extreme temperatures, chemicals, moisture, UV radiation, repeated compression, or continuous movement throughout their service life. The only guarantee that they will perform reliably in real-world applications is passing proper testing.

Quality Testing Helps Manufacturers:

  • Verify material consistency
  • Meet industry regulations and customer specifications
  • Detect manufacturing defects early
  • Improve product lifespan
  • Reduce warranty claims and equipment failures

Manufacturers rely on laboratory testing and real-world simulations to confidently deliver components that meet performance expectations.

Visual Inspection

Quality control usually starts with a thorough visual inspection. It may seem like a simple process, but it helps identify obvious defects before more advanced testing begins.

Things inspectors check:

  • Surface cracks or tears
  • Air bubbles or voids
  • Flash or excess material
  • Color inconsistencies
  • Dimensional accuracy
  • Improper molding

Precision measuring tools such as calipers, optical scanners, or coordinate measuring machines are often used to confirm that components meet design specifications.

Hardness Testing

This tests the rubber material’s resistance to indentation. This property directly affects sealing performance, flexibility, and wear resistance.

Manufacturers typically use a Shore durometer, with Shore A being the most common scale for flexible materials.

Hardness testing ensures:

  • Material consistency between production batches
  • Compliance with customer specifications
  • Proper balance between flexibility and durability

Tensile Strength and Elongation Testing

Rubber components usually experience stretching during installation and operation. Through tensile testing, manufacturers can evaluate how much force a material can withstand before breaking.

During this test, technicians measure:

  • Tensile strength
  • Elongation at break
  • Modulus (stiffness under strength)

This helps the manufacturer determine if the rubber can safely perform under mechanical loads without tearing or breaking.

Compression Set Testing

O-rings and seals, and other rubber components remain compressed for long periods. Through compression set testing, one can determine how well rubber returns to its original shape after being compressed under controlled conditions.

A low compression set indicates excellent elastic recovery, which means it can maintain a reliable seal over time. On the contrary, a high compression set may result in leaks or reduced sealing effectiveness.

Tear Resistance Testing

Rubber usually has small imperfections that can grow into larger cracks during use. Tear resistance testing measures how well the material resists the spread of these tears.

If the material is exposed to repeated movement or abrasion, it can benefit from high tear resistance. Examples are:

  • Conveyor belts
  • Rubber boots
  • Protective covers
  • Flexible couplings

Better tear resistance usually means longer service life.

Abrasion Resistance Testing

Some materials operate with continuous friction. Abrasion testing determines how much material is lost under standardized rubbing or grinding.

This test is especially important for:

  • Tires 
  • Rollers
  • Industrial belts
  • Flooring materials

When rubber components are resistant to abrasion, the need for maintenance is reduced.

Environmental Aging Test

Rubber components are expected to change over time when they are exposed to environmental conditions. Accelerated aging tests simulate years of service in a controlled laboratory setting.

Common environmental tests include:

  • Heat aging
  • Cold temperature testing
  • UV exposure
  • Ozone resistance
  • Humidity testing

These tests can tell whether the rubber will harden, crack, discolor, or lose elasticity over time.

Chemical Resistance Testing

It is usual for rubber components to come into contact with oils, fuels, cleaning agents, acids, or solvents. To tell whether the material can withstand prolonged exposure without swelling, shrinking, softening, or deteriorating, 

Fatigue and Dynamic Testing

Rubber components may undergo millions of loading cycles during their service life. Fatigue testing simulates repeated compression, stretching, bending, or vibration to evaluate long-term durability. Fatigue testing may answer questions like:

  • How long will this part last?
  • How many cycles can it withstand before failure?
  • Where will cracks begin to form?

Dynamic testing can measure:

  • Vibration isolation
  • Damping performance
  • Stiffness under motion
  • Energy absorption
  • Heat buildup during repeated movement
  • General performance under cyclic loading

The materials and components of manufacturing seal systems play an essential role in product performance, durability, and long-term reliability. Learn more about our high-quality sealing solutions and get the expert help you need to meet your application’s unique requirements. Contact us today.

Automated vs. Manual Machinery Maintenance

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Taking care of the machinery utilized in various industries can be a time-consuming and occasionally hazardous task. To help alleviate these issues, many companies have opted for automated maintenance systems, be it in the form of automatic greasing systems or by ensuring they use the right type of seals to keep applications running efficiently without the need of much oversight or repeat maintenance.

But what are the pros and cons of automated machine maintenance versus manual machine maintenance. That’s what we’re going to answer today.

Health Factors

When it comes to health and safety, it’s hard to deny that automated systems can be incredibly beneficial. By removing the need for an individual to go in and clean or adjust different components, it reduces the risk of them potentially hurting themselves.

This point is particularly applicable when it comes to larger machinery that can have a wide range of potentially deadly parts that could cause serious harm if something was to go wrong. Imagine a crushingly heavy peripheral suddenly collapsing while an employee is performing maintenance. While such occurrences are rare, they’re still possible.

But when an automated or semi-automated system is used, it can ensure that employees are out of harm’s way should the unforeseen occur. In this event, the worst case scenario is the automated system being damaged or destroyed – a far smaller price to pay.

Efficiency

While some automated systems can be a little hit and miss, a large majority are very effective at their job. By having your machinery maintained by automated systems or products, it means less time is spent by individuals on keeping machinery in top condition. By extension, this means the machinery will experience less downtime and employees can better focus their time on other tasks, increasing overall operational efficiency.

By having the right seals on different applications and machinery, it means there will be less spills and potential malfunctions. Seals may not be an automated system, but they permit applications to run with greater autonomy without issues arising.

Longer Operational Life and Less Costs

With the right systems in place, machinery and applications will ultimately have longer operational lives. As a result, there will be less downtime and a decreased need to repair or replace machinery, thus resulting in less overall costs. As with anything, automated systems are an investment, but choosing the right ones will save you money in the long run.

When it comes to seals, it’s imperative to choose the right material. If your applications are dynamic (e.g. they move around), then you’ll need a dynamic-friendly sealing comprising the right materials. What material you opt for depends on, for example, factors such as the operating temperatures of the application and the types of chemicals the seals may come in contact with. By knowing these factors and having the seal designed to exact specifications, you’ll find they will last far longer than other seals.

To ensure you have the o-rings and seals for your machinery or application, contact Real Seal today.

Advantages of Polyurethane O-Rings

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What are the Practical Benefits of Polyurethane O-Rings?

If your application requires a material with outstanding physical durability, polyurethane o-rings are the way to go. Polyurethanes, also known as urethanes, derive their unique benefits and advantages through their unique structural bonds. These bonds are unique because of their combinations of soft polyol segments and tough isocyanate segments, creating a flexible but still durable material. There are a variety of types of polyurethane for all kinds of applications.

Types of Polyurethane

Just like all types of materials, polyurethane comes in different types, each with their own benefits and applications. The most common of these varieties is polyester with most urethane seals being based on polyester. Polyester based o-rings are resistant to hydrocarbon oils and hydraulic oils.

Two additional types of polyurethane are polyether based and polycaprolactone based rings. Polyether based o-rings have the advantages of being better for hydrolytic stability and being functional at lower temperatures. Polycaprolactone based o-rings are a subgroup of polyesters with a portion of the low temperature capabilities and oil resistances of the aforementioned polyether rings.

Curatives

Another customizable advantage of polyurethanes is the cure which is used on the o-ring, giving additional properties to the urethane. Similar to other elastomers, millable gum urethanes use the more standard peroxide and sulfur cure systems. Higher performing thermoplastics and thermosetting materials use isocyanate curing systems.

MDI is one of the most common curatives and most often used in thermoplastic materials, as well as millable gum urethanes. MDI is safer for the environment than other diisocyanates.

TODI increases heat resistance and mechanical properties. PPDI has the highest of heat resistances and is best used in applications with hot temperatures.

Properties

Polyurethanes have a wide range of properties with many different advantages and benefits. Hardness can be controlled for whatever the application requires. For applications requiring a high load bearing capacity, polyurethanes are able to return to their normal shape and form after being compressed with minimal damage. Flexibility is also a key benefit of polyurethanes with a wide range of motion and the strength to resist breakage. Durability is a key advantage of polyurethanes, being resistant to tearing and abrasion.

When insulation against various elements is a concern, polyurethanes perform. Electricity, wetness, and various temperature ranges can all be managed with different types of polyurethanes and cures. If your application requires the polyurethane ring to be bonded, that is also something this material can be designed to do, being able to adhere to wood, plastic, or metal.

If contamination of food or other sensitive material is a concern, polyurethanes are sterile against various fungi including mold and mildew.

Generally, polyurethane o-rings have cheaper tooling than plastic, making it a more cost effective option. Polyurethane o-rings are also better at resisting radiation than plastic.

When it comes to advantages of polyurethane over metal, durability is key. Rigid materials wear down faster and can’t conform as easily. Polyurethane o-ring are also quieter and don’t create sparks like metal does. Plus, they don’t rust.

Finding the Right Polyurethane O-Ring

When considering the various types of polyurethane o-rings, it’s best to consult an expert in the field. No matter the design challenges, Real Seal is up to the task. Contact Real Seal today for any questions you have regarding polyurethane o-rings.