HG/T 2177-2011 English PDF (HGT2177-2011)

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HG/T 2177-2011: Appearance quality of tyres
HG/T 2177-2011
ICS 83.160.01
G 41
Record No.. 34510-2012
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HG/T 2177-1998
Appearance quality of tyres
ISSUED ON. DECEMBER 20, 2011
IMPLEMENTED ON. JULY 01, 2012
Issued by. Ministry of Industry and Information Technology of the
People’s Republic of China
HG
Table of Contents
Foreword ... 3 
1  Scope ... 5 
2  Normative references ... 5 
3  Terms and definitions ... 5 
4  Requirements ... 5 
Foreword
This Standard is drafted in accordance with rules given by GB/T1.1-2009.
This Standard replaces HG/T2177-1992.
The main technical differences between this Standard and HG/T 2177-1998 are as
follows.
— Modified the adopted standard (Chapter 2 in version-1998; chapter 2 in this
version);
— Modified the thickness of rubber edge of radial tyre bead circumference (the table
1.1 in version-1998; table 1.1 in this version);
— Modified the groove depth of rubber edge of radial tyre bead circumference (the
table 1.2 in version-1998; table 1.2 in this version);
— Modified the dislocation height of crown die (the table 1.3 in version-1998; table 1.3
in this version);
— Modified the base thickness of radial tyre mold seam plastic edge (table 1.5 in
version-1998; table 1.5 and table 6 in this version);
— Modified the dislocation width of radial tyre mold seam (table 1.6 in version-1998;
table 1.7 in this version);
— Modified the gel lack depth of radial tyre pattern rounded edges and corners (table
1.7 in version-1998; table 1.8 in this version);
— Modified the uneven depth and height inside the ring (table 1.12 in version-1998;
table 1.18 in this version);
— Modified the height and depth of the outside bead-exposed cords, wrapped pleated,
tilt, damage, heavy leather and split (table 1.13 in version-1998; table 1.14 in this
version);
— Modified the edge thickness of bead toe of radial tyre(table 1.15 in version-1998;
table 1.16 in this version);
— Modified the number of cracks in the cord in radical tyre (table1.17 in version-1998;
table 1.18 in this version);
— Modified and added the uneven depth and height in tyre (table 1.20 in version-1998;
table 1.20 in this version);
— Listed the crack and impurity prints of lining in a separate column and modified the
defect depth (table 1.20 in version-1998; table 1.21 in this version);
— Listed the exposed cords in tyre in a separate column (table 1.20 in version-1998;
table 1.22 in this version);
— Added the number of tyre bubble of motorcycle without inner tyre(table 2 in this
version);
— Added the ratio varying in width of tyre bead without inner tyre(table 2 in this
version).
This Standard was proposed by China Petroleum and chemical industry association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Tyre and Rim.
The National Technical Committee for Standardization of Tyre and Rim is entrusted to be
responsible for the interpretation of this Standard.
Drafting organizations of this Standard. Shandong Linglong Tyre Co., Ltd., Fengshen Tyre
Co., Ltd., Sailun Rubber Products limited, Hangzhou Zhongce Rubber Co., Ltd., Xuzhou
Xu Lun Rubber Co., Ltd., Beijing Research and Design Institute of Rubber Industry, Double
Star Group Co., Ltd., and Cooper Chengshan (Shandong) Tyre Co., Ltd.
Main drafters of this Standard. Dong Maohua, Chen Shaomei, Su Pingzhi, Liu Wenming,
Pan Wenlian, Chen Guohua, Pei Xiaohui, Xia Xiangxiu, Xu Lihong, Zhao Huanzhang, Xu
Guangcheng, Zhang Weiwei, and He Xiaomei.
Historical version replaced by this Standard is as follows.
- HG/T 2177-1998.
Appearance quality of tyres
1 Scope
This Standard specifies the requirements for the appearance quality of tyres.
This Standard applies to the pneumatic tyres of trucks, cars, construction machinery,
industrial vehicles, agriculture and motorcycle, solid tyres of pneumatic tire rims, cove tyre
and the flap of pressed-on solid tyres.
2 Normative references
The articles contained in the following documents have become part of this document
when they are quoted herein. For the dated documents so quoted, all the modifications
(Including all corrections) or revisions made thereafter shall be applicable to this
document.
GB/T 6326 Tyre terms and definitions
3 Terms and definitions
The terms and definitions defined in GB/T 6326 apply to this Standard.
4 Requirements
4.1 The appearance quality of tyre shall comply with provisions in table 1 to table 3; the
flap shall comply with provisions in table 4.
4.2 The appearance quality of tyre is allowed to be re-evaluated after its defects have
been rectified and repaired.
Unclear marks
on the tyre
Not allowed Not allowed By visual
Note.
“Special giant” refers to the pneumatic tire with a rim with nominal diameter of 33 in and the above, and nominal section width of 24 in and the above.
“Giant” refers to the pneumatic tire with nominal section width of 18 in and the above that does not meet the conditions referred in the “special giant”.
“Big” refers to the pneumatic tire with nominal section width below 18 in and above 10 in.
“Medium” refers to the non-limousine tyre with nominal section width below 10 in, excluding the pneumatic tire with rim diameter of 12 in and the below.
“Small” refers to limousine tires and the car tires with nominal rim diameter of 12 in and the below.
Table 2 Tyre of motorcycles
No. Defects name Allowable range
1 Crown channelling and dislocation of plastic edge and die orifice
Depth or thickness ≤1.0 mm and the plastic edge height
≤3.0 mm
2 Patten glue starvation or rounded pattern
Depth ≤2.0 mm and the accumulative length ≤ 1/4 of the
circumstance
3 Cracks, cold-lay and glue starvation beside the tyre
Crack. not allowed
Cold-lay and glue starvation. depth ≤ 40% of the plastic
thickness beside the tyre and the length at one location
≤ 50 mm; the that at the other side shall not exceed
three locations.
4 Border break of the bread heel The thickness of that sandwiched with cord edge ≤3.0 mm
5 The thin seam of the first layer of the cord Depth ≤ 3.0 mm and the number of it ≤ 8
The impression of the impurities,
bubble impression or damage on the
thread cap and the tyre side
The depth at thread cap ≤ 20% of the depth of the
pattern ditch
The depth at beside the tyre ≤ 40% of the plastic
thickness of the tire
The diameter of bubble impression ≤ 6.0 mm
All of them shall not exceed two locations (the seal layer
of the tyre without inner tyre shall not have bubbles)
7 Uneven of the tire bead The depth or the height ≤2.0 mm and there is no hard bending in steel ring.
8 Tire bead varying in width
The ratio value between the width difference and the
wide one of tire bead ≤ 30% and the width of the narrow
tyre bead ≥ 70% of the designed width of the tyre bead.
For tyre without inner tyre. The ratio value between the
width difference and the wide one of tire bead ≤ 15%
and the width of the narrow tyre bead ≥ 85% of the
designed width of the tyre bead.
9 Rounded bead toe
The bead toe shall not exceed the ditch and become
limp; the length ≤ 1/3 of the circumstance of the tyre
bead
10 Uneven and impressions of pressed material in tyre
The depth ≤ 1.0 mm and the area ≤ 800 mm2 and the
cross-country tread pattern is allowed to have patterns.
Table 4 Flap
No. Defect name Qualified products
1 Bubbles, im...