The mapped aspects vary depending upon the type of color space. Colors are mapped along axes that represent different aspects of color such as hue or saturation. Defining color begins with a color space - a three-dimensional model describing a set of colors mathematically in relationship to each other. When managing color, there are a variety of systems that mathematically describe colors. In order to do this, one first needs to understand how color is described and defined. In order to fully understand the shortcomings of a particular color tolerancing formula, it is essential to understand how it compares with other tolerancing schemes and what its relationship is to visual assessment. Although a change of this magnitude would be challenging, the transition would alleviate many of the shortcomings inherent to older color space calculations for Delta E, while also increasing efficiencies, saving time, and reducing waste. In order to keep up with the times and rectify these color shortcomings, the plastics industry would be wise to standardize the use of the CMC or CIE2000 DE* formulas. This greatly impacts color development and matching capabilities, leading to production inefficiencies and other challenges. That is because the plastics industry relies upon antiquated color space calculations and tolerancing schemes for determination of color quality, such as CIE 1976 DE* (spherical tolerancing), which does not agree with visual assessment. Despite this widespread integration, the plastics industry lags alarmingly behind textiles when it comes to one important factor - color tolerancing. If the manufacturing process can’t reach the grade, you should consider another method.There is increasing crossover between plastics and textiles, particularly in the apparel and footwear sectors where these two materials intersect in new and ever-ubiquitous ways. The calculation formula can help engineers to know what IT Grade is necessary for producing a part with certain specifications. The tolerance for a particular IT grade can be calculated through the formula as below. In designing, the engineer will determine a key dimension and relative tolerance for a particular feature. The IT Grade is used to indicate how precise an industrial process is.

There are totally 18 grades of tolerance, the smaller the International Tolerance Grade number, the smaller the allowable tolerance zone, the higher the precision level.

It establishes the magnitude of the tolerance zone or allowed amount of part size variation for internal and external dimensions. International Tolerance Grade, also known as IT Grade, identifies what tolerances a specific process can produce for a given dimension defined in ISO 286.

Tolerance de tolerie