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Specification

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ASTM D4956
ASTM D4956,
Standard Specification for Retroreflective Sheeting for Traffic Control
This specification covers flexible, non-exposed glass bead lens and microprismatic, retroreflective sheeting designed for use on traffic control signs, delineators, barricades, and other devices. This specification does not address inks, overlays, or other imaging methods that may be applied to retroreflective sheeting material to create traffic signs or other devices.

Although this specification provides photometric requirements for retroreflective sheeting under evaluation, minimum performance requirements of in-service signs or other devices are outside the scope of this document.

The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Retroreflective sheeting shall be classified as follows.


ASTM D4956 ASTM D4956,Standard Specification for Retroreflective Sheeting for Traffic ControlThis specification covers flexible, non-exposed glass bead lens and microprismatic, retroreflective sheeting designed for use on traffic control signs, delineators, barricades, and other devices. This specification does not address inks, overlays, or other imaging methods that may be applied to retroreflective sheeting material to create traffic signs or other devices. Although this specification provides photometric requirements for retroreflective sheeting under evaluation, minimum performance requirements of in-service signs or other devices are outside the scope of this document. The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Retroreflective sheeting shall be classified as follows. Type Ⅰ : A retroreflective sheeting referred to as “Engineering Grade” that is typically an enclosed lens glass-bead sheeting. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅱ : A retroreflective sheeting referred to as “Super Engineer Grade” that is typically an enclosed lens glass-bead sheeting. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅲ : A retroreflective sheeting referred to as “High-Intensity” that is typically manufactured as an encapsulated glass-bead retroreflective material or as an unmetallized microprismatic retroreflective element material. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅳ : A retroflective sheeting referred to as “High-Intensity” that is typically an unmetallized microprismatic retroreflective element material. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅴ : A retroreflective sheeting referred to as “Super High-Intensity” that is typically a metalized microprismatic retroreflective element material. This sheeting is typically used for delineators. Type Ⅶ : Retroreflective sheeting materials previously classified as Type VII have been reclassified as Type VIII. The use of a designation as Type VII has been discontinued. Type Ⅷ : A retroreflective sheeting typically manufactured as an unmetalized cube corner microprismatic retroreflective element material. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅸ : Aretroreflective sheeting typically manufactured as an unmetalized cube corner microprismatic retroreflective element material. Applications for this material include permanent highway signing, construction zone devices, and delineators. Type Ⅹ : Retroreflective sheeting materials previously classified as Type X have been reclassified as Type VIII. The use of a designation as Type X has been discontinued. Type XI : A retreflective sheeting typically manufactured as an unmetalized cube corner microprismatic retroreflective element material. Applications for this material include permanent highway signing, construction zone devices, and delineators.