Summary: On 25 April, the revised National Standard of Polylactic Acid (GB/T29284–2024) was released, taking effect as of 1 Nov., 2024, to replace the 2012 version (GB/T29284-2012).
Over
the recent years of gradual implementation of the "plastic ban" policy, China has been pushing industrialisation in the biodegradable materials
industry. Higher levels of regulation and standardisation on the
technical requirements of related products is one of the key moves, and
polylactic acid (PLA) is one of the key focuses in the industry
development.
On 25 April, the National Standard of Polylactic Acid (GB/T29284–2024) was
issued, which is the first revision since the release of the 2012
version (GB/T29284-2012) by the State Administration for Market Regulation (SAMR) and Standardization Administration of the People's
Republic of China (SAC). The new national standard comes into effect as
of 1 Nov., 2024, replacing the GB/T29284-2012.
The
2024 version was drafted by Zhejiang Hisun Biomaterials Co., Ltd.,
Anhui BBCA Biochemical Co., Ltd., Pliith Biotechnology Co., Ltd., Zhuhai
Kingfa Biomaterial Co., Ltd., Henan Jindan Lactic Acid Technology Co.,
Ltd., Yangzhou Huitong Technology Co., Ltd., Henan Longdu Torise
Biomaterials Co., Ltd., Shenzhen Esun Industrial Co., Ltd., Ma'anshan
Tong-Jie-Liang Biomaterials Co., Ltd., Beijing Technology and Business
University, Chinese Academy of Sciences, etc. It provides definitions of
PLA resin, stipulates categorisation, requirements, inspection rules,
labelling, packaging, transport and storage, and lists out the
applicable test methods.
The
standard applies to PLA resins processed from lactic acid or lactide
through polymerisation, grades PLA resins into: special grade, extrusion
grade, injection moulding grade and fibre grade, along with the
performance requirements.
Table Performance requirements on PLA resins
|
No
|
Inspection item
|
Requirement
|
|
Special gradea
|
Extrusion grade
|
Injection moulding grade
|
Fibre grade
|
|
1
|
Sensory requirement
|
Generally transparent or semi-transparent particles, no strange smell, no foreign matter
|
|
2
|
Water, %
|
≤0.05
|
|
3
|
Density, g/cm3
|
1.25±0.05
|
|
4
|
Melt mass flow rate (MFR) deviation, (190℃, 2.16kg)/(g/10 min)b
|
MFR<5
|
±1.0
|
±1.0
|
-
|
±1.0
|
|
5≤MFR<10
|
±2.0
|
±2.0
|
-
|
±2.0
|
|
10≤MFR<20
|
±5.0
|
±2.0
|
±2.0
|
±2.0
|
|
MFR≥20
|
±10.0
|
-
|
±10.0
|
±10.0
|
|
5
|
Melting point, ℃
|
-
|
≥160 for biaxially oriented film
|
≥125
|
≥145 for staple fibres
|
|
≥145 for sheets
|
|
≥140 for extrusion and film blowing
|
≥160 for long staple
|
|
≥140 for blow moulding
|
≥125 for core-structure skin
|
|
6
|
glass transition temperature, ℃
|
-
|
≥55
|
|
7
|
Tensile breaking stress, MPa
|
-
|
≥45.0
|
|
8
|
Charpy notched impact strength, kJ/m2
|
-
|
≥1.0
|
|
9
|
Relative biodegradation rate, %
|
≥90
|
|
10
|
Ash content, %
|
≤0.1
|
|
11
|
Lactide content, %
|
-
|
≤0.50
|
|
12
|
Molecular Weight Distribution Index (MWDI)
|
-
|
≤2.00
|
≤2.20
|
≤1.80
|
|
13
|
Chromaticity colourc
|
-
|
-
|
-
|
-
|
Note:
a: Performance indicators and the related test methods for special
grade that are not given in the table may be determined by the agreement
between the parties. b: Temperature at MFR test can be altered to 210℃
if consensus is reached.c: Indicator of Colour can be determined by the
parties.
Source: National Standard of Polylactic Acid (GB/T29284–2024)
Source:CCM
More information can be found at CCM Bio-based Materials China Quarterly Report.
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