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  • ASTM
    F870-94(2010) Standard Practice for Tread Footprints of Passenger Car Tires Groove Area Fraction and Dimensional Measurements
    Edition: 2010
    $103.58
    Unlimited Users per year

Description of ASTM-F870 2010

ASTM F870 - 94(2010)

Standard Practice for Tread Footprints of Passenger Car Tires Groove Area Fraction and Dimensional Measurements

Active Standard ASTM F870 | Developed by Subcommittee: F09.30

Book of Standards Volume: 09.02




ASTM F870

Significance and Use

The tread of a tire, the annular band that contacts the pavement, normally contains geometric tread pattern elements that are defined by grooves or voids. These are employed to confer appropriate traction properties to the tire, mainly on wet or snow-covered roads.

One characteristic feature of tire tread patterns that is important for both traction and tire wear behavior is the percent or fractional groove area. The groove-area fraction is calculated with respect to the total or gross contact area.

1. Scope

1.1 This practice covers a technique for measuring the groove or void area of a tire tread pattern. The void area is measured on the inked impression of a tire tread statically loaded against heavyweight paper on a load platen.

1.2 This procedure is intended to serve as a reference practice for measuring groove or tread pattern void areas in a tire-footprint impression. This technique is usable by any laboratory without special equipment although more sophisticated procedures are also commonly employed, such as optical or video camera processes.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

F538 Terminology Relating to the Characteristics and Performance of Tires


Keywords

footprint; groove area fraction; tire footprint impression; Automobile; Dimensions; Footprints (in tires); Groove area analysis/measurement; Tire testing; Tread surface wear patterns; Voids--passenger car tires;


ICS Code

ICS Number Code 83.160.10 (Road vehicle tyres)


DOI: 10.1520/F0870-94R10

ASTM International is a member of CrossRef.

ASTM F870

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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