Determination of AK LV 110 Shore L Hardness

The “AK LV 110 Shore L Hardness Determination” standard, prepared by Audi, Bavarian Motor Works, Daimler Chrysler, Porsche, and Volkswagen automobile companies, describes the hardness test method (Shore L) for polyurethane (PUR) foam used in steering wheels.

Polyurethane is a plastic material available in various forms. It can be designed to be rigid or flexible and is a preferred material in the automotive industry.

The AK-LV 110 standard is a specific engineering standard used in the automotive industry, particularly by German manufacturers and suppliers. The AK-LV standard series ensures consistent quality and performance in vehicle components. Examples include:

AK LV 02 Requirements for airbag cushions.
AK LV 16 Specifications for electric igniters in pyrotechnic systems (e.g., airbags and seatbelt pretensioners).
AK LV 124 12V provides comprehensive verification testing for electrical and electronic components in vehicle systems.

In this context, the AK LV 110 standard is very important for internal component suppliers. The AK-LV 110 standard focuses on the hardness testing of polyurethane (PUR) foam used in steering wheel covers. It primarily includes:

Test method: Determination of Shore L hardness (a special scale for measuring the hardness of soft materials such as foams).
Application: Material requirements for PUR foam in steering wheel covers.
Objective: To ensure the foam meets precise stiffness specifications for safety, comfort, and durability in automotive interiors.

This test is crucial because the steering foam must balance softness for grip comfort with sufficient firmness to withstand prolonged use, temperature changes, and potential impacts.

In modern vehicles, steering wheels incorporate advanced materials for ergonomics, safety (e.g., energy absorption in collisions), and integration with controls. Consistent material properties, such as stiffness, prevent issues like premature wear, inconsistent feel, or failure under stress. Compliance with the AK LV 110 standard helps manufacturers meet regulatory safety standards and maintain high-quality interiors.

Test laboratories specializing in automotive materials perform the AK LV 110 test using standardized Shore L durometers to measure indentation resistance.

Particularly for companies in the automotive supply chain, such as those producing interior foam or steering systems, this standard ensures that products comply with the original equipment manufacturer (OEM) expectations of German car manufacturers.

In short, the AK LV 110 standard specifies the material requirements, such as hardness, physical properties, and other test criteria, that PUR foam used in steering wheel covers must meet during manufacturing and verification. This standard is similar in style to many internal automotive material specifications that define how parts should be manufactured and tested to meet quality, safety, and durability expectations for steering wheels and other internal components.

The primary objectives of the AK LV 110 standard generally include the following:

Defining material property limits: Such as hardness (Shore L), density, and performance under stress.
Ensuring component consistency: This ensures that the steering foam behaves predictably during production and use.
Harmonizing supplier outputs: Different suppliers must meet the same basic quality standards for the parts.
Testing and certification: Supplier and original equipment manufacturer laboratories can verify compliance using established test methods.

This type of standard is crucial because automotive interior components must meet expectations for fit, appearance, and safety, as well as performance, including tactile feel, durability, heat resistance, and more.

The AK LV 110 standard is important because it plays a critical role in ensuring the quality, safety, and consistency of automotive interior components throughout the supply chain. The main reasons why this standard is considered important are as follows:

Steering wheel safety and functionality ensured: Steering wheels are safety-critical components. The PUR foam used in their construction must provide the following:
Absorbing energy in small bursts.
To maintain its shape and integrity during airbag deployment.
To provide a controlled tactile response for the driver.

This standard defines material performance limits that help ensure the steering wheel behaves predictably and safely in real-world driving and crash scenarios.

It guarantees consistent material quality: Without a defined standard, foam properties, such as stiffness, density, and elastic behavior, can vary significantly between suppliers or production batches. This standard establishes uniform acceptance criteria, ensuring that each approved material meets the same basic quality standard.
It supports original equipment manufacturers and suppliers: This standard serves as a common technical language among them.
Automotive original equipment manufacturers
First and second tier suppliers
Testing and certification laboratories

This consistency reduces misunderstandings, manufacturing defects, and disputes by clearly defining what constitutes acceptable material.

It provides reliable testing and verification: This standard enables the following by specifying test methods and conditions (e.g., hardness testing):
Objective material verification
Repeatable laboratory measurements
Comparable results from different testing facilities.

This is crucial for supplier approval, production audits, and change management.

Improves durability and customer perception: Steering wheel foam directly affects the following:
Long-lasting wear resistance
Resistance to heat and aging
Perceived quality and comfort
This standard helps prevent problems such as the following by enforcing strict material requirements:
Premature softening or hardening
Surface degradation
Inconsistent feeling between vehicle models.

This protects brand image and customer satisfaction.

In conclusion, the AK LV 110 standard is extremely important in the automotive industry, especially for companies involved in steering wheel design, material testing, and internal component manufacturing.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "AK LV 110 Shore L hardness determination" standard.