The “TSH1564G Fogging Test Method for Interior Paint” standard, a Toyota engineering standard, describes a test method developed specifically for evaluating the fogging or misting properties of painted surfaces used in the automotive industry, particularly for interior trim parts (such as instrument panels, door panels, and overhead covers).
Plastic and painted parts in car interiors, exposed to high temperatures, can release volatile organic compounds over time. These substances condense on glass surfaces, forming a thin layer of mist (fog). This situation:
The TSH1564G standard is used to measure this type of unwanted fogging and determine whether materials are at an acceptable level. This standard is an important part of the interior quality standards in Toyota vehicles.
The primary purpose of this test method is to determine the fogging characteristics of interior part paints. Several procedures are defined in this standard, the most common being:
Other standards similar to the TSH1564G standard include:
Toyota generally requires low defogging values. Exact limits vary depending on the model and part.
This testing method is particularly essential for the following parts:
Many independent testing laboratories offer accredited testing services according to this standard. Automotive first and second-tier suppliers must demonstrate compliance with the TSH1564G standard to develop Toyota-approved materials.
In short, the TSH1564G standard is part of Toyota's series of standards that includes test methods for evaluating paint films used on interior and exterior vehicle components.
This standard establishes a controlled test method for measuring the fogging behavior of painted interior parts. Fogging refers to the release of volatile organic compounds (VOCs) or plasticizers from materials when exposed to high temperatures, which can then condense on cooler surfaces such as the inside of a windshield.
The aim of this standard is to ensure that interior coatings do not cause haze, oily deposits, or visibility problems in vehicles over time.
In modern automotive interiors, many components are painted or coated, including:
When these materials are exposed to heat in a vehicle cabin, volatile compounds can evaporate and condense on cooler surfaces such as windows or instrument panels.
The fogging test provides the following:
The TSH1564G standard test method simulates high-temperature conditions inside a vehicle. A painted sample is heated in a sealed test chamber, allowing volatile compounds to evaporate and condense on a cooled surface. The condensed material is then evaluated to determine the fogging level.
Typical measurement methods include:
These methods determine the level of fogging and whether the coating meets Toyota's requirements.
While specific parameters may vary depending on component requirements, this testing method generally includes the following:
The TSH1564G standard primarily applies to the following materials:
This method can be applied to both raw painted materials and finished interior components before they are approved for production.
The TSH1564G standard is typically used in conjunction with other Toyota paint evaluation methods, including:
Together, these standards ensure that automotive coatings meet Toyota's requirements for durability, appearance, and environmental performance.
The TSH1564G standard fogging test is commonly used by:
Compliance with this standard ensures that the interior trim used in Toyota vehicles provides long-term clarity, cleanliness, and safety within the cabin.
In summary, the TSH1564G standard defines a fogging test method used to evaluate volatile emissions from paints applied to automotive interior components. This method measures the condensation of evaporating substances on a cooler surface, ensuring that interior coatings do not form haze or residue that could affect visibility or cabin air quality.
For many years, our organization, with its competent and experienced team, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the TSH1564G standard to businesses.
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