MAN M 3150-7 Surface Quality - Evaluation of Textured Painted and Veined Surfaces

The standard “MAN M 3150-7 Surface quality - Assessment of textured painted and grained surfaces” developed by the automotive company MAN describes a procedure for assessing textured painted and grained surfaces within the scope of surface quality of vehicles.

Essentially, the MAN M 3150 series of standards was designed to allow uniform assessment of the surface quality and structure and colour harmony of coatings on MAN commercial vehicles (cabin, cabin add-on parts, chassis and bus exterior and bus interior).

This standard applies to trucks from the EURO 6 vehicle generation onwards. Special regulations may apply for military vehicles.

This series of standards applies to both in-house parts and purchased parts, regardless of the quality and type of component material (sheet metal, plastic).

The purpose of this part of the MAN M 3150 standard series is to define uniform criteria for the assessment of the surface quality of textured painted and grained surfaces of cabin interiors and exteriors in order to guarantee a uniform surface condition in terms of texture, colour and gloss on the components. The requirements are derived from customer requirements and state-of-the-art technology.

For the purposes of this standard,

• Design publication sample is the color idea published by the design team. Design publication standard is a colorimetric reference, and the original standard is the basis for the main and main-main.
• The impact angle (test angle) is the angle measured from the mirror angle of the incident light in the direction of the incident light beam (DIN 6175-2).
• Colour differences according to DIN EN ISO 11664-4 are explained in the MAN M 3150-2 standard.
• An example of a finished part is a complex component that may be composed of different materials with different surfaces (e.g. steering wheel, roof console, door trim).
• The degree of gloss (surface brightness) describes the reflective properties of surfaces and materials. The unit of measurement is gloss units.
• Semi-finished products are existing products that have not yet been processed into their final form. These products have the visual and tactile characteristics of the final product.
• The master is the sample that gives the best result according to the specifications. The master contains the binding measured values.
• A master-master is any other replicated sample that is within the tolerance range of the original sample. Master-master samples are also used as display samples and can be distributed to businesses and possibly suppliers for this purpose.
• A sample standard is a reproduction of a design release sample in terms of color, gloss, texture and grain in the form of color range samples, swatch sheets, sample plates, sections from finished parts or finished parts. Sample standards are used for visual sample inspection.
• The SMC module (related to the color care module) is a quality feature for statistical mean value calculation. Statistical measurement control makes it possible to obtain representative values ​​with high statistical significance. For this purpose, a standard error must be defined. The minimum number of measurements is defined during the test process and the maximum number is limited to 20.
• The structures are reliefs and regular stitching, which in places lead to different pile heights and therefore visually noticeable contrast differences.
• The original sample is the result of the surface development process completed by the design department in the form of a sample as input for this process (in color charts, the designation is the original color sample).
• The original standard is the sample standard that is arithmetically closest to the original color. It is the only colorimetric reference.
• The original color is the arithmetic mean value of the absolute color coordinates of all (maximum 300) sample standards.

Among the numerous tests, measurements, analyses and evaluations carried out for businesses in various sectors, our organization also provides testing services defined in the “MAN M 3150-7 Surface quality - Evaluation of textured painted and veined surfaces” standard with its trained and expert staff and advanced technological equipment.