SAE J361 pdf download
SAE J361 pdf download.(R) Procedure for Visual Evaluation of Interior and Exterior Automotive Trim.
1. This SAE Recommended Practice applies to paris and materials used In vehicle manufacture which are intended to be acceptable color matches to a specified standard. This document is intended for use with parts or materials which are opaque or nearly so. Materials covered by this document include topcoat paint finishes, interior sort trim, interior and exterior hard trim, and exterior film and flexible trim.
1.1 Purpose—The intent of this document is to precisely specify procedures for the visual evaluation of appearance of colored materials or parts incoqxxated in the manufacture of vehicles. The document provides a consistent engineering practice for the determination of visual color difference between materials or parts of the same or like materials. A suitable fixture providing daylight, fluorescent, and horizon lighting conditions is necessary for this evaluation.
2. References
2.1 Applicable Publications—The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest Issue of SAE publications shall apply.
2.1.1 ASTM PuBUcA’rloNs—Available from ASTM. 100 Barr Harbor Drive. West Conshohocken. PA 19428-2959.
ASTM E 284—Terminology of Appearance
ASTM E 308—Practice for Computing the Colors of Objects by using the CIE System
ASTM E 1499-97—-Standard Guide to the Selection, Evaluation and Training of Observers
2.1.2 CIE PUBucATI0Ns—Available from USNC-CIE Publications Office, TLA Lighting Consultants. 7 Pond St., Salem, Massachusetts. 01970. www.cie-usnc.org.
CIE Publication 51—Method for Assessing the Quality of Daylight Simulators for Colorimetry
2.2 Related Publications—The following publications are provided for information purposes only and are not a required part of this document.
2.2.1 ASTM PusucATloNs—Available from ASTM. 100 Barr Harbor Drive. West Conshohocken, PA 19428-2959.
ASTU D 1729—Standard Practice for Visual Evaluation of Color and Color Differences 01 Diffusely Illuminated Opaque Materials
4.1 Ughting Unit(s)—Each color evaluation area shall be provided with an overhead lighting unit (along with an accompanying material examination perch/stand) capable of broadcasting the following lighting conditions:
4.1.1 Daylight capable of providing a color temperature of 6500 K ± 200 K at an illuminance of 1080 to 1730 lux (100 to 160 ft’candles). This source is typically provided by filtered Tungsten Halogen Lamps. The resulting spectral power distribution 01 the incident light must be maintained to conform to ASTM E 308 and CIE Publication 51, Category A.
4.1.2 Cool White Fluorescent (CWF) capable of providing a color temperature of 4150 K i 200 K at a minimum illuminance of 860 lux (80 ft-candles). This source is typically provided by Cool White Fluorescent tubes.
4.1.3 Simulated horizon sunlight source providing a color temperature of 2300 K ± 200 K at a minimum illuniinance of 860 lux (80 ft-candles). This source is typically provided by Tungsten Halogen Lamps to simulate early morning sunrise or late afternoon sunset conditions.
4.1.4 As an option, an ultraviolet lighting source (no Kelvin value assodated) can be used alone or in combination with any of the previous light sources to exaggerate the effects of optical brighteners, whitening agents, fluorescent pigments, dyes, or resins. DO NOT USE ULTRAVIOLET LIGHT FOR A COLOR MATCH DECISION. DO NOT LOOK DIRECTLY INTO A ULTRAVIOLET LIGHT SOURCE BECAUSE EYE DAMAGE CAN OCCUR FROM PROLONGED EXPOSURE TO UV LIGHT.
4.1.5 lwur VOLTAGE—FOllOW manufacturer’s installation instructions for proper input voltage requirements.
4.2 LightIng Booths—As a minimal condition, a light booth can be utilized for color evaluation purposes only if agreed upon by the customer and supplier. The booth should be placed so that it is at least 1070 mm (42 in) above floor level and should be set-up so that direct viewing into Ihe booth is possible.
4.3 LIght Meter—A calibrated light meter is required for checking the intensity levels of the lighting sources.
4.4 Color Temperature Measuring Instrument—A spectro-radiometer or colorimeter must be used to check color temperature of the light sources, These units must be calibrated using a NIST traceable 6500 K source
£ Viewing Environment—To perform accurate visual color matching, the viewing environment must be set up and maintained to be consistent with other locations in the industry. (Refer to Appendix B. Environmental Evaluation Checklist.)
5.1 Perch and Surround—Color of Perch and surround shall be neutral gray, defined as Munsell N6-N7 (L61 71) with a maximum Ctiroma C= 1.0, visually appearing neutral.
5.2 Ambient Light—The light units and examination perch shall be placed in an area that WILL NOT ADMIT ambient light into the viewing environment.
5.2.1 ENCLOSED Roou—An enclosed room is the preferred location for the installation of the light units. The walls shall be painted with Munsell N6-N7 (161 .71) flat paint. (This paint is available from any major supplier.) Adequate ventilation of the room must be provided to prevent overheating of the lamps.
5.2.2 ENCLosIio JRTAlN—tf a room is not available, an enclosing curtain will be suitable. The curtain must be dull in finish and the color must be as close as possible to Munsell N6-N7 (L61 .71). Curtain must also be dense enough to prevent ambient light penetration and must surround the viewing area. A minimum distance of 914 mm (3 it) must be maintained between the enclosure or curtain and the front of the perch to allow proper viewing from all directions.
