ASTM D6901 is a standard specification outlining the physical and performance requirements for artists' colored pencils. The standard covers a wide range of parameters including colour, lightfastness, breaking strength, sharpenability and erasability.
Color is an important parameter for artists' colored pencils, and standards specify the requirements for color matching and color stability. Pencils need to match specific color standards under standard lighting conditions and also need to retain their color when exposed to light for a specified period of time.
Lightfastness is another important parameter, as artists need to be confident that their work will not fade over time. This standard specifies minimum lightfastness levels based on exposure to a xenon arc for a specified period of time.
Breaking strength is an important mechanical property because artists need pencils that are strong enough to withstand the rigors of use without breaking. The standard specifies the minimum breaking strength, and the maximum variation in strength between pencils.
Sharpenability and erasability are also important parameters, as artists need pencils that can be easily sharpened to fine points and that can be erased cleanly without damaging the paper. The standard specifies requirements for both properties, including maximum diameter change after sharpening and minimum erasability under specified conditions.
ASTM D6901 is a standard specification that sets requirements for artists' colored pencils, including specifications for pencil pigment content, color range, and physical properties such as lead diameter, hardness, and breaking strength. The standard also specifies test methods to determine these properties. The purpose of the standards is to ensure that artists' colored pencils meet certain quality standards and performance requirements.
In summary, ASTM D6901 is an important standard for artists' colored pencils, providing guidance on physical and performance requirements that can help ensure product quality and reliability. By adhering to this standard, manufacturers can provide artists with pencils that meet their needs for color, lightfastness, strength, sharpness, and erasability.
