Volvo STD 1026-8202 Grey Scale for Evaluating Paintwork

The “Volvo STD 1026-8202 Grey Scale for Evaluating Dyeing” standard, developed by Volvo, describes the grey scale and its use in determining staining in adjacent fabrics in colorfastness tests. A precise colorimetric characteristic of the scale is provided as a permanent record against which newly prepared working standards, which may have changed, can be compared.

The basic or 5-step scale consists of five pairs of non-glossy gray color chips (or pieces of gray fabric) showing perceived color differences corresponding to fastness grades 5, 4, 3, 2, and 1.

This basic scale can be extended by providing similar chips or samples showing perceived color differences corresponding to half-step fastness grades 4-5, 3-4, 2-3, and 1-2; these scales are called 9-step scales. The first member of each pair is a neutral gray color, and the second member of the pair, showing fastness grade 5, is identical to the first member.

The second members of the remaining pairs gradually darken, so that each pair shows increasing contrasts or perceived color differences, which are defined colorimetrically. The full colorimetric characteristics are given below.

Chips or samples should be white or neutral gray in color and measured with a spectrophotometer containing a reflective component. Colorimetric data should be calculated using the CIE 1964 supplementary standard colorimetric system (10-degree observer data) for the D65 illuminator.

The Y tristimulus value of the first member (white) of each pair should be less than 85.

The color difference between the second member of each pair and the first member next to them should be as shown in the standard table:

In the automotive manufacturing world, where durability, aesthetics, and safety intersect and risks are high, rigorous testing standards form the foundation of quality assurance. Volvo, recognized for its commitment to innovation and safety, has developed a comprehensive suite of corporate standards to ensure every component, from engines to exterior parts, meets rigorous criteria. Among these, the Volvo STD 1026-8202 standard stands out as a critical tool for evaluating the visual integrity of painted surfaces. Closely aligned with international standards, this standard plays a vital role in maintaining the flawless appearance and longevity of vehicles in real-world conditions.

As Volvo continues its leadership in the production of sustainable and electric vehicles, standards like Volvo STD 1026-8202 remain important. These standards not only guide suppliers but also reflect the company's holistic approach to engineering excellence.

The Volvo STD 1026-8202 standard is a specific test protocol focusing on the grey toning assessment of paint. This standard provides a systematic method for measuring changes in color, contrast, and overall appearance after exposure to environmental stressors. It is part of Volvo’s broader STD 1026 standard series, which covers various color fastness and light resistance tests designed for interior and exterior vehicle components.

Essentially, the Volvo STD 1026-8202 standard is compliant with the “ISO 105-A03 Textiles – Colour fastness tests – Part 03: Grey toning for assessing staining” standard published by the International Organization for Standardization. This compliance guarantees global harmonization, ensuring that Volvo’s suppliers worldwide adhere to a common benchmark. Grey toning refers to a visual assessment tool, consisting of a series of paired grey samples ranging from identical tones (fifth degree, no perceptible difference) to sharp contrasts (first degree, highly noticeable difference). Evaluators can objectively assess the degree of change in a dyed surface by comparing a test sample to this scale.

This standard applies particularly to automotive paints, coatings, and topcoats, where even minor deteriorations can affect customer satisfaction, resale value, and brand reputation. Unlike more mechanical tests (e.g., impact resistance), this standard focuses on aesthetic durability, ensuring that Volvo vehicles maintain their distinctive sleek design integrity over time.

The implementation of the Volvo STD 1026-8202 standard involves a controlled and repeatable process that combines human observation with standardized lighting and reference materials. This process essentially includes the following steps:

• Sample preparation: Test samples, such as painted metal panels, plastic coatings, or fabric pieces, are prepared to mimic real vehicle parts. These are then subjected to stress factors such as UV light, moisture, abrasion, or thermal cycling, depending on the complementary tests in the STD 1026 family of standards.
• Reference setup: A grayscale reference consisting of five pairs of gray cards (from virtually identical to maximally different) is placed under controlled illumination. Standard D65 daylight is typically used to simulate natural viewing conditions while minimizing aberration caused by artificial lighting.
• Visual assessment: Trained evaluators compare the stressed sample side-by-side using grayscale. A score is assigned based on the closest match to the perceived difference.
• Rating 5: No visible change, excellent performance.
• Grade 4-5: A slight difference, almost imperceptible.
• 3rd-4th degree: A clear but acceptable difference.
• Grade 2-3: A significant difference, potentially problematic.
• Grade 1-2: A significant change, unacceptable for production.
• First degree: Complete incompatibility, failure.
• Indicators and thresholds: Results are recorded with photographic evidence and numerical scores. Volvo typically requires a minimum rating of 3-4 for exterior paints to withstand years of sun and weather exposure.

This method, developed over decades to account for variations in human visual perception, has become indispensable in quality control laboratories.

The Volvo STD 1026-8202 standard is essential for the supply chain. Key applications include: exterior cladding, interior trim, supplier compliance, and material innovation.

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 in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "Volvo STD 1026-8202 Grey scale for paint evaluation" standard.