Interior Trim Components
Metrological Evaluation of Color and Gloss Level Visual Evaluation of Chrome Surfaces
Previous issues
VW 50190: 2000-11, 2006-10Changes
The following changes have been made compared with VW 50190: 2006-10:–
Standard completely revised
Group Standard
VW 50190
Issue 2011-01
Class. No.:50202
Descriptors:
colorimetrics, interior trim, color constancy, color difference, sample standard, original standard, gloss level, chrome surface
Verify that you have the latest issue of the Standard before relying on it.
This electronically generated Standard is authentic and valid without signature.
The English translation is believed to be accurate. In case of discrepancies, the German version is alone authoritative and controlling.
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This Standard is available to contracting parties solely via the B2B supplier upsupply.
© Volkswagen Aktiengesellschaft
VWNORM-2010-08e
Scope
This standard defines the requirements for color deviations and the measurement and evaluation conditions for the use of technical instruments to determine color differences on components of the vehicle interior trim. It applies to the sample and production monitoring of the following materials:Solid-colored and non-luminescent textiles –Insensitive to stroking, without structure –Insensitive to stroking, with structure –Sensitive to stroking, without structure
Plastic parts
–With grained surfaces (leather grain, fine structure, etc.)
–With painted surfaces (soft-touch paint, decorative paint, etc.)–Slush part, foam film, PU hard foam (dashboard area, sun visor)Painted metal parts (exception: parts painted in body color)Leather (genuine leather and leatherette)Definitions
Styling release sample
Color idea released by the Styling Department. The styling release sample is a colorimetric reference and provides the basis for the original standard and for the sample standards.Sample standard
Sample standard for the Volkswagen brand
Reproduction of the styling release sample with regard to color, gloss, feel, texture, and grain in the form of sample sheets, finished part sections, or entire finished parts.Sample standards are used for visual sampling purposes.Sample standard for the Audi brand
The painted sample standard serves as reference for the visual and colorimetric evaluation of all surfaces. This painted sample standard for color consists of a painted DIN A5 plastic panel. It serves as visual and colorimetric reference. The visual impression, however, predominates. Sample stan‐dards for materials such as , e.g., leather are used only as a reference for structure and feel.Original tone
Computed mean value of the absolute color coordinates of all (maximum 300) sample standards.Original standard
The original standard is the sample standard that is closest to the computed original tone. It serves as the exclusive colorimetric reference.
1  2  2.1
2.2  2.2.1
2.2.2
2.3
2.4
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Finished part sample
Complex part which may consist of different materials with different surfaces (e.g., steering wheel,overhead console, door trim panel)Solid color
Solid-color surfaces are surfaces whose overall visual impression is of a single color.Insensitive to stroking
Textiles are insensitive to stroking if they do not exhibit any visually discernable contrast differences when stroked by hand.Sensitive to stroking
Textiles are sensitive to stroking if they exhibit visually discernable contrast differences when stroked by hand (e.g., velours, tufted fabrics, Alcantara).Structures
Structures are embossments and consistent seam contours that create different pile heights in places,thus producing visually discernable contrast differences.Gloss level
Also referred to as surface gloss. Describes the reflection properties of surfaces and materials.Specified in metrological terms in gloss units (GU).Description
Color constancy according to VW 50190.
Requirements General requirements
A plausibility test of the metrologically determined limits for visual acceptance, which is defined by Volkswagen AG during advance engineering, is used as the basis for the metrological tolerances.Revisions may be made in the production phase due to technical influencing factors.The supplier is required to monitor the process using statistical process control.
Components must be measured by the supplier without exception and delivered with the corre‐sponding report. In addition, the measured values must be checked for plausibility regarding the visual impression (even when the metrological evaluation yields an OK result).
Without exception, all metrological and visual evaluations are conducted under both the D65 (day‐light) and F11 (artificial light) standard illuminants. The values must be recorded accordingly in the test reports and measurement reports.
In any case, the colorimetric evaluations are carried out in consideration of the corresponding gloss levels. These levels are to be entered in the test and measurement reports as well.
2.5  2.6
2.7
2.8
2.9
2.10
3
4  4.1
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For colorimetric evaluations of unpainted plastic parts, the semi-crystalline sample standard is always used as a reference, irrespective of the material.
For colorimetric evaluations of leather, the leatherette variant is always used as a reference.The fluctuation range of the color values from 10 individual measurements must not exceed ± 0,15 CIELAB units (exception: ΔL*).
On principle, the evaluation is subject to visual acceptance in as-installed position.
The standard tolerance values specified in this standard serve as a target value at the start of the sampling phase. Different values are possible depending on the material and the color variant. If there are deviating tolerance values, they will be noted in the appropriate Technical Supply Specification (TL), drawing, or sample standard, or communicated to the testing parties. If no deviating tolerance values have been agreed upon, the specifications in this standard apply.
If a color standard does not feature the relevant grain, use of the alternative grains from Table 1 is recommended for the colorimetric evaluation.
Table 1
Non-available
grain
1st Alternative
2nd Alternative
K43K31-K86K31-K30K31-K41K31-K24K31-K64K09K9A K8A K09K9A K9A K09-K08K09K9A K3A K09K9A K2G K09K9A K2K K09K9A K50K09K9A K77K85-K3D
K85
-
For the Audi brand, the color tolerances are always indicated on the back of the color sample stan‐dards (see Appendix A for examples). The gloss specifications must be obtained from the I/GQ-33representative in charge of the component ("Gloss list"). Depending on material and installation po‐sition, exceptions can be agreed upon with the I/GQ-33 representative in charge of the component if this is required for the visual acceptance. The visual impression in installed position takes precedence over the measurement in any case.
Hence, the tolerances indicated in Section 4.2 are not binding for Audi AG.
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Tolerance specifications
Three deviation ranges are specified:–"OK" = (grade 1) = release
–"Conditionally OK" = (grade 3) = Quality assurance control limit, may be used conditionally with
deviation permit (AWE)
–"Not OK" = (grade 6) = rejection
The second decimal place of delta values is rounded as follows: < 5 = round down; ≥ 5 = round up.Tolerances for sampling of textiles that are insensitive to stroking with and without structure (e.g., headliner decoration, solid-colored upholstery materials)
See Table 2.
Table 2
"OK " range (1)"Conditionally OK " range (3)
"Not OK " range (6)
|ΔL*| ≤ 0,70,8 ≤ |ΔL*| ≤ 0,9|ΔL*| ≥ 1,0|Δa*| ≤ 0,30,4 ≤ |Δa*| ≤ 0,5|Δa*| ≥ 0,6|Δb*| ≤ 0,3
0,4 ≤ |Δb*| ≤ 0,5
|Δb*| ≥ 0,6
Tolerances for sampling of textiles that are sensitive to stroking without structure (e.g.,load compartment trim, carpets)
See Table 3.
Table 3
"OK " range (1)"Conditionally OK " range (3)
"Not OK " range (6)
|ΔL*| ≤ 0,90,8 ≤ |ΔL*| ≤ 1,2|ΔL*| ≥ 1,3|Δa*| ≤ 0,30,4 ≤ |Δa*| ≤ 0,5|Δa*| ≥ 0,6|Δb*| ≤ 0,3
0,4 ≤ |Δb*| ≤ 0,5
|Δb*| ≥ 0,6
Basic tolerance for the sampling of non-textile components or components with non-textile surfaces (color grouping according to interior trim colors)
Black colors (e.g., Satin Black; Titanium Black; Anthracite) and brown colors (e.g., Natural Brown; Walnut; Tobacco; Sevilla, Buffalo)
See Table 4.
Table 4
"OK " range (1)"Conditionally OK " range (3)
"Not OK " range (6)
|ΔL*| < 0,350,35 ≤ |ΔL*| ≤ 0,45|ΔL*| > 0,45|Δa*| < 0,250,25 ≤ |Δa*| ≤ 0,35|Δa*| > 0,35|Δb*| < 0,25
0,25 ≤ |Δb*| ≤ 0,35
|Δb*| > 0,35
4.2  4.2.1
4.2.2
4.2.3
4.2.3.1
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