ICS 59.060.20
W 51
People’s Republic of China National Standard
GB/T 14189-2015 （Replaces GB/T 14189-2008）
Published on September 11, 2015 Implemented on April 1, 2016
General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China
Standardization Administration of the People’s Republic of China – Released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009. It replaces GB/T 17932-1999 “Polyester Chips for Film.”
Compared with GB/T 17932-1999, the main changes in this standard are as follows:
The terminology and definition section added the term “foreign matter.”
Product classification was added.
Changes were made to the requirements section, including the addition of the “premium grade” and the classification into three grades: premium, first-grade, and qualified.
Enhanced assessment requirements for premium grade characteristic viscosity.
Changed from unilateral control to bilateral control for assessment values of glycol content, carboxyl content, and melting point in premium grade; increased requirements for these values.
Changed the unit of measurement for ash content assessment from percentage (%) to milligrams per kilogram (mg/kg).
Added quality indicators and corresponding test methods for aggregation particles, iron content, and powder in film-grade polyester chips; added quality indicators and corresponding test methods for iron content and powder in film-grade mother material polyester chips.
Changes in the test methods section include:
Adoption of GB/T 14190 for the characteristic viscosity test method.
Changes in the packaging section include:
The addition of content such as “The packaging of film-grade polyester chip products can be divided into bagged and tank truck forms” and “The tank truck transporting products should be clean and dry”; added requirements for the product storage period.
This standard was proposed by the China Textile Industry Federation.
This standard is under the jurisdiction of the Shanghai Textile Industry Technical Supervision Institute.
The drafting unit of this standard is Sinopec Yizheng Chemical Fiber Co., Ltd., and Shanghai Textile Industry Technical Supervision Institute.
The main drafters are Lihua Ye, Meiying Xu, Lili Wang, Liuliu Gong, and Xinsheng Hu.
The previous versions of the standard replaced by this one include GB/T 17932-1999.
1 Scope
This standard specifies the product classification, requirements, test methods, inspection rules, marking and packaging, transportation, and storage requirements for film-grade polyester chips (PET) for film.
It is applicable to film-grade base material polyester chips produced primarily from terephthalic acid and ethylene glycol, and film-forming masterbatch polyester chips with the addition of additives such as silicon dioxide or other inorganic salts. Film-forming masterbatch polyester chips with other additives can be referred to as needed. （I have written an article introducing different classification methods for polyester chips. Details can be found here.）
This standard does not apply to polyester chips for sheet materials.
2 Normative References
The following documents are essential to the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 4146.3 Textiles – Chemical fibers – Part 3: Terms
GB/T 6678-2003 General rules for sampling chemical products
GB/T 6679-2003 General rules for sampling solid chemical products
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 14190 Fiber-grade polyester chip (PET) test methods
3 Definitions and Terms
Terms and definitions defined in GB/T 4146.3 and GB/T 14190, as well as the following terms, apply to this document:
3.1 Foreign Matter
Non-polyester substances.
4 Product Classification
Film-grade polyester chips are classified into film-grade base material and film-forming masterbatch categories based on the addition of silicon dioxide or other inorganic salts.
5 Requirements
5.1 Appearance
5.1.1 Film-grade base material polyester chips: Uniform, transparent particles without foreign matter or visible dark spots.
5.1.2 Film-forming masterbatch polyester chips: Uniform, transparent, or semi-transparent particles without foreign matter or visible dark spots.
5.2 Product Grading
Quality indicators for film-grade polyester chip products are classified into three grades: Excellent, First Class, and Qualified, with anything below Qualified considered as Ungraded.
5.3 Performance Indicators
Performance items and indicators for film-grade base material polyester chips are listed in Table 1.
（I have written an article introducing the specific meanings of various indicators. Details can be found here.）
5.3.2 Film-forming Masterbatch Polyester Chip Performance Items and Indicators
See Table 2 for the performance items and indicators of film-forming masterbatch polyester chips.
（I have written an article introducing the specific meanings of various indicators. Details can be found here.）
6 Test Methods
6.1 Inherent Viscosity Test
Conduct the inherent viscosity test according to the capillary viscometer method specified in GB/T 14190. The unit for inherent viscosity is dL/g, with a phenol/1,2-dichlorobenzene mass ratio of 50:50 or 60:40. The result should be accurate to three decimal places.
6.2 Melting Point Test
Conduct the melting point test according to the microscopic method or differential scanning calorimetry (DSC) method specified in GB/T 14190. The result should be accurate to the digit.
6.3 Carboxyl End Group Content Test
Conduct the carboxyl end group content test according to the volumetric titration method or photometric titration method specified in GB/T 14190. The result should be accurate to the digit.
6.4 Color b Value Test
Conduct the color b value test according to the drying method specified in GB/T 14190.
6.5 Moisture Content Test
Conduct the moisture content test according to the weight method specified in GB/T 14190. The result should be accurate to one decimal place.
6.6 Agglomerate Particle Test
Conduct the agglomerate particle test according to the specifications in GB/T 14190.
6.7 Diethylene Glycol Content Test
Conduct the diethylene glycol content test according to the methanol ester degradation method specified in GB/T 14190. The result should be accurate to one decimal place.
6.8 Iron Content Test
Conduct the iron content test according to the specifications in GB/T 14190. The result should be accurate to the digit.
6.9 Powder and Irregular Chips Test
Conduct the powder and irregular chips test according to the specifications in GB/T 14190. The test result for powder should be accurate to the digit, and for irregular chips, it should be accurate to one decimal place.
6.10 Ash Content Test
Conduct the ash content test according to the specifications in GB/T 14190. The unit is milligrams per kilogram (mg/kg), and the result should be accurate to the digit.
6.11 Appearance Test
After uniformly mixing the sample, take approximately 50g and evenly distribute it on a white dish or filter paper for visual inspection. Observe for the presence of foreign matter and visible black particles.
7 Inspection Rules
7.1 Inspection Types
Inspection types include type testing and factory testing. Type testing is required under the following circumstances:
a) Periodic inspections as specified;
b) When there are changes in production design, technology, or raw materials that may affect product quality;
c) When there is a significant difference between the results of factory testing and the last type test;
d) When the national inspection agency requires type testing.
7.2 Inspection Items
7.2.1 All performance items in Tables 1 and 2 are type testing items.
7.2.2 The six performance indicators in Table 1, including inherent viscosity, carboxyl end group content, color, moisture, diethylene glycol content, and irregular chips; and the seven performance indicators in Table 2, including inherent viscosity, carboxyl end group content, color, moisture, diethylene glycol content, irregular chips, and ash content, are factory testing items. The rest are periodic testing items.
7.3 Batch Rules
Within a certain range, periodic sampling is used to form batch numbers for inspection. A production batch can consist of one or several inspection batches.
7.4 Sampling Rules
7.4.1 For factory testing, samples are automatically extracted by an online sampler or manually extracted at certain time intervals on the production line.
7.4.2 Sampling of packaged products shall be conducted in accordance with GB/T 6679-2003. The number of sampling packages shall be in accordance with GB/T 6678-2003.
7.4.3 The sample quantity for testing shall not be less than 500g, and for arbitration, the sample quantity shall not be less than 1000g.
7.5 Judgment Rules
7.5.1 The measured or calculated values of performance indicators are compared with the limit values in Tables 1 and 2 using the rounding method specified in GB/T 8170 to determine the grade.
7.5.2 Grade determination is done item by item, and the lowest grade among all performance indicators determines the grade of the batch.
7.6 Reinspection Rules
7.6.1 General
Upon delivery to the receiving party, promptly inspect the outer packaging, quantity, and quality of the packaging. If quality is affected due to transportation or storage, the responsible party should be identified.
If, within three months of delivery, the receiving party discovers that the product quality does not comply with the quality report or the quantity is incorrect, a request for reinspection can be submitted. If more than one-third of the batch has been used, reinspection should not be requested.
If the receiving party can provide relevant evidence proving that the batch of products does indeed affect the quality of subsequently processed products and causes severe losses, the reasons should be analyzed, responsibilities clarified, and a negotiation process initiated. If necessary, arbitration can be applied for.
7.6.2 Inspection Items
Same as 7.2. During arbitration, if there are items involving more than two test methods, the A method specified in GB/T 14190 is generally used; if both parties agree, the B method can be adopted.
7.6.3 Batch Formation Rules
Group batches according to the original production batch number.
7.6.4 Sampling Rules
Same as 7.4.
7.6.5 Reinspection Evaluation
7.6.5.1 The measured or calculated values of quality index items are compared with the limit values in Tables 1 and 2 using the rounding method specified in GB/T 8170 to determine the grade.
7.6.5.2 Evaluation of the overall product grade is based on 7.5.2. If it is higher than or equal to the original grade, it is deemed compliant; if lower, it is deemed non-compliant.
8 Marking
The packaging should indicate relevant information such as product name, specifications, grade, batch number, net weight, production date, product standard number, trademark, producer’s name, address, and warning signs for protection and handling.
9 Packaging, Transportation, and Storage
9.1 Packaging
9.1.1 Products are packaged in bags or shipped in bulk using tank trucks. Packaging bags should be woven bags with liners. If necessary, they can be covered with polyethylene dustproof film. The tank trucks used for transportation should be clean and dry.
9.1.2 Each batch of products should be accompanied by a product certificate.
9.2 Transportation
The product is not classified as a dangerous item. During transportation and loading/unloading processes, follow the specified product warning signs and take precautions to prevent moisture, exposure, pollution, and packaging damage. Dumping during transportation is prohibited.
9.3 Storage
9.3.1 Products should be stacked by batch and placed in a warehouse that is cool, dry, well-ventilated, and equipped with firefighting facilities. Keep them away from heat sources and avoid direct sunlight. Outdoor stacking is strictly prohibited.
9.3.2 The storage period for products generally begins from the production date and should not exceed 18 months.
