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Regulation (EC) No 1222/2009 of the European Parliament and of the CouncilShow full title
Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance)
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[F13. GENERAL TEST CONDITIONS U.K.
3.1 Track characteristics U.K.
The test track shall have the following characteristics:
(1)
The surface shall have a dense asphalt surface with a uniform gradient of not more than 2 % and shall not deviate more than 6 mm when tested with a 3 m straight edge.
(2)
The surface shall have a pavement of uniform age, composition, and wear. The test surface shall be free of loose material and foreign deposits.
(3)
The maximum chipping size shall be 10 mm (tolerances permitted from 8 mm to 13 mm).
(4)
The texture depth as measured by a sand patch shall be 0,7 ± 0,3 mm. It shall be measured in accordance with ASTM E 965-96 (Reapproved 2006).
(5)
The wetted frictional properties of the surface shall be measured with either method (a) or (b) in section 3.2.
3.2 Methods to measure the wetted frictional properties of the surface U.K.
(a) British Pendulum Number (BPN) method U.K.
The British Pendulum Number method shall be as defined in ASTM E 303-93 (Reapproved in 2008).
Pad rubber component formulation and physical properties shall be as specified in ASTM E 501-08.
The averaged British Pendulum Number (BPN) shall be between 42 and 60 BPN after temperature correction as follows.
BPN shall be corrected by the wetted road surface temperature. Unless temperature correction recommendations are indicated by the British pendulum manufacturer, the following formula is used:
BPN = BPN (measured value) + temperature correction
temperature correction = – 0,0018 t 2 + 0,34 t – 6,1
where t is the wetted road surface temperature in degrees Celsius.
Effects of slider pad wear: The pad shall be removed for maximum wear when the wear on the striking edge of the slider reaches 3,2 mm in the plane of the slider or 1,6 mm vertical to it in accordance with section 5.2.2 and Figure 3 of ASTM E 303-93 (Reapproved 2008).
For the purpose of checking track surface BPN consistency for the measurement of wet grip on an instrumented passenger car: the BPN values of the test track should not vary over the entire stopping distance so as to decrease the dispersion of test results. The wetted frictional properties of the surface shall be measured five times at each point of the BPN measurement every 10 meters and the coefficient of variation of the averaged BPN shall not exceed 10 %.
(b) ASTM E 1136 Standard Reference Test Tyre (SRTT14″) method U.K.
By derogation with point (4) of section 2, this method uses the reference tyre that has the characteristics indicated in ASTM E 1136-93 (Reapproved 2003) and referred to as SRTT14″ (1) .
The average peak braking force coefficient ( μ peak,ave ) of the SRTT14″ shall be 0,7 ± 0,1 at 65 km/h.
The average peak braking force coefficient ( μ peak,ave ) of the SRTT14″ shall be corrected by the wetted road surface temperature as follows:
peak braking force coefficient ( μ peak,ave ) = peak braking force coefficient (measured) + temperature correction
temperature correction = 0,0035 × ( t – 20)
where t is the wetted road surface temperature in degrees Celsius.
3.3 Atmospheric conditions U.K.
The wind conditions shall not interfere with wetting of the surface (wind-shields are allowed).
Both the wetted surface temperature and the ambient temperature shall be between 2 °C and 20 °C for snow tyres and 5 °C and 35 °C for normal tyres.
The wetted surface temperature shall not vary during the test by more than 10 °C.
The ambient temperature must remain close to the wetted surface temperature; the difference between the ambient and the wetted surface temperatures must be less than 10 °C.]
Textual Amendments
(1)
[F1The size of the ASTM E 1136 SRTT is P195/75R14.]
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