GB/T 41876-2022 English PDF (GBT41876-2022)

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GB/T 41876-2022: Technical specification of cured-on solid tyres
GB/T 41876-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.99
CCS G 41
Technical specification of cured-on solid tyres
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Technical requirements ... 5
5 Test methods ... 5
6 Marking ... 6
Appendix A (Normative) Measurement method of peripheral dimensions of tyres
... 7
Appendix B (Normative) Test methods for physical-mechanical properties of
tyres ... 9
Technical specification of cured-on solid tyres
1 Scope
This document specifies the technical requirements, test methods, and marking for
cured-on solid tyres.
This document applies to new cured-on solid tyres used on counterbalanced forklift
trucks and other industrial vehicles.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-
strain properties
GB/T 531.1 Rubber, vulcanized or thermoplastic - Determination of indentation
hardness - Part 1: Durometer method (Shore hardness)
GB/T 1689 Rubber vulcanized - Determination of abrasion resistance (Akron
machine)
GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces
for physical test methods
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests - Air-oven method
GB/T 6326 Tyre terms and definitions
GB/T 7760 Rubber, vulcanized or thermoplastic - Determination of adhesion to a
rigid substrate - 90 degrees peel method
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 22391 Test method of endurance for solid tyres - Drum method
HG/T 2177 Appearance quality of tyres
Appendix A
(Normative)
Measurement method of peripheral dimensions of tyres
A.1 Measurement items
The outer circumference and section width of the tyre.
A.2 Measurement conditions
A.2.1 After the tyre is vulcanized, it shall be parked at room temperature for more than
48 h. Before testing, the tyre and rim assembly shall be parked at a temperature of
18 °C~36 °C for at least 24 h.
A.2.2 Measurement tools and their accuracy requirements are as follows:
a) Steel ruler and metal tape measure (without arc): 1 mm;
b) Vernier caliper: 0.1 mm;
c) Calipers.
A.3 Measurement methods
A.3.1 Outer circumference of tyre
Use a metal tape measure to wrap around the tyre along the centerline of the crown or
near the highest point of the centerline, to measure the outer circumference. The unit of
the measured values is millimeter and round up to an integer. And according to formula
(A.1), obtain the outer diameter.
A.3.2 Section width of tyre
Select the widest part of the sidewall without a mark; use a vernier caliper or calipers
and a steel ruler to measure the section width at four points at approximately quarters
of the tyre circumference. Take the arithmetic mean. The unit of the measured values is
millimeter and round up to an integer.
A.4 Calculation method
The outer diameter of the tyre is calculated according to formula (A.1).
Appendix B
(Normative)
Test methods for physical-mechanical properties of tyres
B.1 General requirements
B.1.1 After the tyre is vulcanized, it shall be parked at room temperature for more than
48 h. Before testing, it shall be conditioned for at least 24 h in the standard laboratory
environment specified in GB/T 2941.
B.1.2 When the surface of the sample or test piece taken from the tyre is uneven OR
the thickness is greater than the corresponding standard, it shall be cut and polished
according to GB/T 2941. When the thickness of the sample is less than the
corresponding standard, according to the actual thickness of the sample, it can be cut
into test pieces for testing.
B.2 Tests for physical-mechanical properties of tread rubber
B.2.1 Tensile properties before and after ageing
B.2.1.1 When sampling, for the tread part, take the centerline of the crown as the
reference. Take samples along the longitudinal direction. If the thickness of the tread
rubber is 6 mm~10 mm, cut a layer of middle-layer test piece. If the thickness of the
tread rubber is more than 10 mm, cut the middle and lower two layers of test pieces.
(Special cuts for crown patterns are not limited to this).
B.2.1.2 Cut and polish the sample into a type 2 test piece conforming to GB/T 528.
Mark the position and layer of the test piece.
B.2.1.3 When the tread pattern is special AND it is impossible to cut the standard-size
test piece, according to the actual situation, the clamping part of the test piece can be
cut.
B.2.1.4 Carry out the tensile properties test according to GB/T 528. Carry out the tensile
properties test after ageing according to GB/T 3512.
B.2.2 Hardness
B.2.2.1 Cut a sample - with a length of not less than 40 mm, a width of not less than 15
mm, and a thickness of not less than 6 mm - from the tread. Or stack up to 3 samples of
the same layer to form a test piece.
B.2.2.2 According to GB/T 531.1, measure the hardness of each layer of samples. The