IS 8085 (Part 29): 2024, aligned with ISO 20866: 2018, provides a standard method for testing the delamination resistance of insoles, which is an important factor in ensuring the durability and performance of footwear. Delamination refers to the separation or peeling of layers of composite materials, such as soles, which can cause discomfort, reduced performance, and even shoe breakage.

Insoles, which offer the required support, cushioning and comfort, are made from a range of materials including rubber, foam, leather and composites. Irrespective of the material, insoles and extensions, maintaining the integrity of the shoe is a major concern. Under these standardized tests, the sole meets the firmest quality standards, ensuring that the shoe is durable and comfortable.

What is IS 8085 (Part 29): 2024?

IS 8085 (Part 29): 2024 is the Indian Standard that aligns with ISO 20866: 2018, titled Footwear - Test methods for insoles - Delamination resistance. It outlines the procedures for testing the delamination resistance of insoles used in footwear, ensuring that insoles do not separate under the stresses encountered during daily use. This standard was established by the Bureau of Indian Standards (BIS), based on the commendations of the Footwear Sectional Committee and approved by the Chemical Division Council.

The primary objective of this standard is to offer a uniform method for assessing the durability of insoles in footwear, irrespective of the materials used in their manufacturing. Whether the insole is made of foam, rubber, leather, or any complex material, this standard helps determine how well the layers of the insole hold together, an important aspect for both comfort and longevity.

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Why is Delamination Resistance Important?

Delamination resistance is essential because an insole’s performance is directly connected to its physical integrity. In general, wearing shoes, walking on the sunbed, running, and many other activities are constantly helps check the comfort level. Other key importance includes:

• Ensures Durability and Longevity: The durability of the shoe and the delamination resistance are important. As the layers of the insole begin to distinct (delaminate), the cushioning and support capacity of the insole reduces. Insoles with high delamination resistance will maintain their structure over time, confirming that shoes last longer and perform efficiently.
• Prevents Loss of Comfort: The insole is intended to offer comfort through cushioning and shock absorption. If delamination happens, the layers of the sole can separate, which can cause uneven support and discomfort during wear. High abrasion resistance helps maintain consistent comfort levels throughout the shoe's lifetime.
• Maintains Performance Under Stress: Footwear is exposed to constant mechanical stress, especially in areas like the heel and arch. Insoles with poor delamination resistance are more likely to fail when subjected to these stresses, resulting in reduced functionality. Delamination resistant insoles are more proficient of enduring pressure and upholding their performance even during heavy use.
• Ensures Adhesive Reliability: Insoles are often made of several layers joined together using adhesives. Delamination resistance is used to effectively test the adhesive strength and bonding ability of materials under different conditions. A high delamination resistance specifies that the adhesive and material used are reliable, reducing the likelihood of product failure due to bonding issues.
• Improves Safety: In certain categories of footwear, such as work boots or athletic shoes, the insole plays a vital role in guarding the foot from peripheral effects or severe environments. Delamination can compromise the cushioning or safety ability of the insole, increasing the risk of injury. In fact, ensuring high delamination resistance increases the safety of wearable equipment, especially in physically demanding or hazardous situations.
• Boosts Consumer Satisfaction and Brand Trust: A shoe that performs well over time and deprived of delamination increases customer satisfaction. Customers are more likely to trust and recommend a brand that produces long-lasting and high-quality products. For manufacturers, confirming puncture resistance not only meets standards but also enhances brand reputation and consumer loyalty.

Scope of IS 8085 (Part 29): 2024

The scope of IS 8085 (Part 29) specifies the method for determining the delamination resistance of insoles, irrespective of the material. The standard applies to all types of insole materials, regardless of the composition, as long as the insole undergoes a composite or layered construction. This means that no matter what material is used rubber, foam, leather, or any other it is necessary to test the ability of the insole to resist delamination.

Delamination resistance testing confirms that the insole material performs well in both dry and wet conditions, simulating real-world use. Wet conditions, in actual, require closer testing, as moisture can weaken the material, which can lead to delamination. By producing a standardized approach, this test benefits producers produce products that are durable and reliable under varying conditions.

Key Features of IS 8085 (Part 29): 2024

Following are some key features of IS 8085 (Part 29): 2024:

• Test Method: The test method specified in IS 8085 (Part 29) follows a systematic approach to determine the force required to separate the internal structure of the insole material. The procedure involves several key steps:

1. Preparation of test pieces: Using a circular knife, samples with a specific diameter (38.0 mm ± 1.0 mm) are cut from the insole.
2. Assembly of test equipment: The test piece is bonded to a pair of cylinders using an adhesive and then placed into a press that applies force on the test assembly.
3. Testing: The assembly is placed into a tensile-testing machine, which separates the cylinders at a specific speed (25 mm/min ± 5 mm/min). The maximum force applied before the insole delaminates is recorded.

The procedure is repeated for three test pieces to ensure accuracy, and the average force required for delamination is calculated.

• Dry and Wet Testing: The standard specifies two types of testing conditions:

1. Dry Test: The insole is tested in its natural state, with no moisture exposure. This test measures the insole’s performance under regular conditions.
2. Wet Test: The insole samples are soaked in distilled water for a specified period (6 hours ± 0.5 hours) before testing. This simulates the impact of moisture on the delamination resistance, providing insight into how the insole will perform under wet conditions.

Apparatus and Materials: The standard provides specific requirements for the apparatus and materials used in the test. These specific requirements ensure that the test is repeatable and reliable, providing consistent results:

1. A tensile-testing machine (dynamometer) with a constant rate of traverse of 25 mm/min ± 5 mm/min.
2. Solid cylinders for mounting the insole samples during testing, with precise dimensions to ensure accurate results.
3. Collars to maintain the alignment of the cylinders and test pieces.
4. Vernier callipers to measure the diameter of test pieces.
5. Polymer adhesive (typically a chloroprene rubber type) to bond the insole material to the cylinders.
6. Distilled water for wet testing.

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Importance of Standardization in Footwear Testing

IS 8085 (Part 29): 2024 standard is very important for the footwear industry to maintain stability and reliability. In addition to global trade and competition, manufacturers need to meet international standards to ensure that their products are of high quality. Implementation of ISO 20866: 2018 as an Indian standard means that the testing methods are globally documented, which is valuable for producers who are exporting their products.

• Consistency and Reliability: Standardization confirms uniform test procedures, which yield reliable results that can be compared between manufacturers and regions.
• Global Compatibility: Footwear products that follow international standards can be recognized and accepted all over the world, which facilitates trade.
• Improved Product Quality: Consistent testing helps manufacturers identify weaknesses early, which can lead to better quality, durable and high performance products.
• Consumer Confidence: Inspection of footwear established standards comforts consumers that the product is safe, reliable and meets quality expectations. 
• Obedience with Regulations: Standardized methods ensure obedience with local and international regulations, which helps manufacturers address legal matters and product returns.
• Facilitates Innovation: In addition to clear testing procedures, manufacturers can innovate with confidence, knowing that other products will be tested fairly against industry standards.
• Cost-Effectiveness: Standardization minimizes unnecessary testing, saves time and money, and helps reduce the risk of costly product failures.

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Impact on the Footwear Industry

For the footwear industry, delamination is a main concern, particularly for shoes that undergo heavy use, such as athletic shoes or work shoes.

For the footwear industry, delamination is a major concern, especially for shoes that undergo heavy use, such as athletic footwear or work boots. By obeying to IS 8085 (Part 29), a manufacturer can reduce the chances of product failures related to delamination, which in turn can improve the overall quality of the products.

For consumers, the advantage are clear. A good pair of sock shoes will provide comfort, long-lasting performance, and support your performance. In addition, they can be sure that the insoles are designed to resist separation even under demanding conditions, such as moisture or high stress.

Conclusion

IS 8085 (Part 29): 2024 is a significant Indian Standard that guarantees the durability and performance of insoles used in footwear by providing a standardized method for testing delamination resistance. It outlines the procedures for testing the delamination resistance of insoles used in footwear, ensuring that insoles do not separate under the stresses encountered during daily use. By following this testing procedure, manufacturers can assess the strength and longevity of insole materials, ensuring their products meet the expectations of consumers.

This standard not only guarantees the quality and reliability of footwear but also passes stability, fairness and innovation to the global footwear market. The implementation of Indian standard ISO 20866: 2018 is a step towards alignment with international best practices, which will ensure that the Indian footwear industry thrives in a competitive global market. For consumers, the result is a better quality shoe, more comfortable and longer lasting product that meets the industry's highest standards.