GB/T 18881-2017 English PDF (GBT18881-2017)

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GB/T 18881-2017: Catalyst for light-duty petrol vehicle exhaust purification
GB/T 18881-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
G 75
Replacing GB/T 18881-2009
Catalyst for light-duty petrol vehicle exhaust purification
ISSUED ON. OCTOBER 14, 2017
IMPLEMENTED ON. MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Product classification ... 7 
5 Requirements ... 7 
6 Test methods ... 9 
7 Inspection rules ... 10 
8 Marks, packaging, transport, storage and quality certificate ... 12 
Annex A (normative) Determination method for back pressure (air flow
resistance) evaluation ... 14 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 18881-2009 "Catalyst for petrol vehicle exhaust
purification".
Compared with GB/T 18881-2009, in addition to the editorial modifications, the
main technical changes are as follows.
- added the pollutant emission limit and measurement method of light-duty
petrol vehicle (China V-stage) (see Clause 2);
- modified the hole density value in product classification table 1 (see
Clause 4);
- modified the engine bench performance conversion rate requirements of
fresh catalyst (see 5.6);
- added the terms and definitions of space velocity, precious metal content,
coating weight loss ratio, back pressure, nominal back pressure,
percentage of plugged hole of catalyst (see 3.5~3.10);
- added the requirements and test methods of precious metal content and
proportion (see 5.3, 6.3);
- added the requirements and test methods of coating weight loss ratio (see
5.4, 6.4);
- added the product requirements and test methods of back pressure (see
5.5, 6.5).
This Standard shall be under the jurisdiction of National Technical Committee
on Rare Earth of Standardization Administration of China (SAC/TC 229).
The drafting organizations of this Standard. Kunming Guiyan Catalyst Co., Ltd.,
Nonferrous Metals Technology and Economic Research Institute, Wuxi Weifu
Environmental Protection Catalyst Co., Ltd., Youyan Rare Earth New Material
Co., Ltd.
Main drafters of this Standard. Zheng Tingting, Xia Wenzheng, Zheng Yi, He
Xiaokun, Yang Dongxia, Song Guanyu, Cui Meisheng, Jia Liwei, Zhang Yongqi.
The historical version substituted by this Standard is.
- GB/T 18881-2009.
Catalyst for light-duty petrol vehicle exhaust purification
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marks,
packaging, transport, storage and quality certificate of catalyst for light-duty
petrol vehicle exhaust purification.
This Standard is applicable to the catalyst for light-duty petrol vehicle exhaust
purification which uses cordierite honeycomb ceramic carrier as matrix and
loads with rare earth, precious metal or other metal and other active
components.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 2828.1, Sampling procedures for inspection by attribute - Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 5181, Automotive emission - Terms and definitions
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 17803, Designation system for rare earth products
GB 18352.3, Limits and measurement methods for emissions from light-duty
vehicles
GB 18352.5, Limits and measurement methods for emissions from light-duty
vehicles (CHINA 5)
GB/T 18377, Requirements and measurement methods of catalytic
converters for petrol vehicles
GB/T 23277, Chemical analysis methods of catalysts containing precious
metals - Determination of platinum palladium and rhodium in automobile
exhaust-purifying catalysts - Spectrophotometry
6.5 Back pressure
Test air flow rate setting at 328 kg/h, 656 kg/h, two working conditions. Test
method is according to the provisions in Annex A.
6.6 Catalytic performance
Test method of catalyst engine stand is according to the provisions of GB/T
18377.
6.7 Overall vehicle performance and durability
Test methods of overall vehicle performance and durability are in accordance
with the provisions of GB 18352.5.
6.8 Physical properties
Test method for physical properties of the catalyst is according to the provisions
of XB/T 505.
6.9 Numerical rounding
Numerical rounding is in accordance with the provisions of GB/T 8170.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The product shall be inspected by the supplier's quality and technical
supervision department to ensure that the product quality meets the
requirements of this Standard. And fill in the quality certificate.
7.1.2 The purchaser shall test the received product according to the
provisions of this Standard. If the test result does not comply with the provisions
of this Standard, it shall be submitted to the supplier within 3 months from the
date of receipt of the product, and shall be settled by the supplier and the
purchaser. If arbitration is required, the sampling shall be conducted by both
parties, at the purchaser's site.
7.2 Batching
Products shall be submitted in batches. Each batch shall consist of the products
of the same designation, the same production process, the same specification,
the same batch number.
7.3 Inspection item
7.3.1 Before leaving factory, each batch of products shall be subject to the
unqualified items, the product shall be determined as unqualified.
7.5.3 When the inspection results of precious metal content and proportion,
coating weight loss ratio, back pressure and catalytic performance engine
bench are unqualified, take double samples for re-inspection of failed items. If
there are still unqualified items, the product shall be determined as unqualified.
7.5.4 When the inspection results of overall vehicle performance and
durability are unqualified, it shall be settled by the supplier and the purchaser
via negotiation.
8 Marks, packaging, transport, storage and quality
certificate
8.1 Marks, packaging
8.1.1 The following information shall be printed on the product packaging box.
a) supplier name;
c) supplier address;
c) product name;
d) product specifications;
e) batch number;
f) quantity;
g) exit-factory date;
h) waterproof, anti-acid, anti-pressure, anti-drop and other signs.
8.1.2 The packaging box design shall consider the product waterproof, anti-
collision, to ensure that the product is not damaged during transport.
8.2 Transport
Do not vibrate strongly during transport to prevent the infiltration of water or
other liquids.
8.3 Storage
The product shall be stored in a ventilated, dry, non-corrosive warehouse.
8.4 Quality certificate