ASTM D6779 - 23

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Designation: D6779 −23
Standard Classiﬁcation System for and Basis of Speciﬁcation for
Polyamide Molding and Extrusion Materials (PA)
1
This standard is issued under the ﬁxed designation D6779; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This classiﬁcation system covers polyamide materials
suitable for molding and extrusion. Some of these composi-
tions are also suitable for application from solution.
1.2 The properties included in this classiﬁcation system are
those required to identify the compositions covered. Other
requirements necessary to identify particular characteristics
important to specialized applications are to be speciﬁed by
using suffixes as given in Section 5.
1.3 This classiﬁcation system and subsequent line callout
(speciﬁcation) are intended to provide a means of calling out
plastic materials used in the fabrication of end items or parts.
It is not intended for the selection of materials. Material
selection can be made by those having expertise in the plastic
ﬁeld after careful consideration of the design and the perfor-
mance required of the part, the environment to which it will be
exposed, the fabrication process to be employed, the costs
involved, and the inherent properties of the material other than
those covered by this classiﬁcation system.
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
standard.
1.5 The following precautionary caveat pertains only to the
test methods portion, Section 11, of this classiﬁcation system.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety,
health, and environmental practices and determine the appli-
cability of regulatory limitations prior to use.
NOTE 1—This classiﬁcation system is similar to ISO 16396-1 ⁄-2,
although the technical content is signiﬁcantly different.
NOTE 2—The materials covered by this classiﬁcation system include a
subset of polyamides deﬁned as polyphthalamides (PPA) as in 3.2.1, some
of which are also classiﬁed in ASTM D5336. Speciﬁcally, groups 7, 10,
12, 13, 14, 15 and 17 in this standard are PPA materials. ASTM D5336
gives further details relating to groups 10, 12 and 13.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
D257 Test Methods for DC Resistance or Conductance of
Insulating Materials
D789 Test Method for Determination of Relative Viscosity
of Concentrated Polyamide (PA) Solutions
D792 Test Methods for Density and Speciﬁc Gravity (Rela-
tive Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plas-
tics
D3892 Practice for Packaging/Packing of Plastics
D4000 Classiﬁcation System for Specifying Plastic Materi-
als
D5336 Classiﬁcation System and Basis for Speciﬁcation for
Polyphthalamide (PPA) Injection Molding Materials
D5740 Guide for Writing Material Standards in the Classi-
ﬁcation Format
D6260 Test Method for Gravimetric Determination of Car-
bon Black in Nylon Materials (PA) (Withdrawn 2004)
3
D7209 Guide for Waste Reduction, Resource Recovery, and
Use of Recycled Polymeric Materials and Products (With-
drawn 2015)
3
1
This classiﬁcation system is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
Current edition approved March 15, 2023. Published March 2023. Originally
approved in 2002. Last previous edition approved in 2021 as D6779 - 21. DOI:
10.1520/D6779-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
The last approved version of this historical standard is referenced on
www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1

E29 Practice for Using Signiﬁcant Digits in Test Data to
Determine Conformance with Speciﬁcations
2.2 IEC/ISO Standards:
4
IEC 60243-1 Electrical Strength of Insulating Materials—
Test Methods—Part 1: Tests at Power Frequencies
IEC 60250 Recommended Methods for the Determination of
the Permittivity and Dielectric Dissipation Factor of
Electrical Insulating Materials at Power, Audio and Radio
Frequencies Including Metre Wavelengths
ISO 75-1 Plastics—Determination of Temperature of De-
ﬂection Under Load—Part 1: General Test Methods
ISO 75-2 Plastics—Determination of Temperature of De-
ﬂection Under Load—Part 2: Plastic and Ebonite
ISO 179-1 Plastics—Determination of Charpy Impact
Strength—Part 1: Non-instrumented Impact Test
ISO 294-1 Plastics—Injection Moulding of Test Specimens
of Thermoplastic Materials—Part 1: General Principles,
Multipurpose-Test Specimens and Bars
ISO 307 Determination of Viscosity Number of Polyamides
In Dilute Solutions
ISO 527-1 Plastics—Determination of Tensile Properties—
Part 1: General Principles
ISO 527-2 Plastics—Determination of Tensile Properties—
Part 2: Testing Conditions
ISO 1183 Plastics—Methods for Determining the Density
and Relative Density of Non-Cellular Plastics
ISO 3451-4 Plastics—Determination of Ash—Part 4: Poly-
amides
ISO 11357-1 Plastics—Differential Scanning Calorimetry—
Part 1: General Principles
ISO 11357-3 Plastics—Differential Scanning Calorimetry—
Part 3: Determination of Temperature and Enthalpy of
Melting and Crystallization
ISO 15512 Plastics—Determination of Water Content
ISO 16396-1 Plastics—Polyamide (PA) moulding and extru-
sion materials—Part 1: Designation system, marking of
products and basis for speciﬁcations
ISO 16396-2 Plastics—Polyamide (PA) moulding and extru-
sion materials—Part 2: Preparation of test specimens and
determination of properties
ISO 20753 Plastics—Test Specimens
3. Terminology
3.1 The terminology used in this classiﬁcation system is in
accordance with Terminologies D883 and D1600.
3.2 Deﬁnitions of Terms Speciﬁc to This Standard:
3.2.1 polyphthalamide, PPA, n—a polyamide in which resi-
dues of terephthalic acid or isophthalic acid or a combination
of the two comprise at least 55 molar percentage of the
dicarboxylic acid portion of the repeating structural units in the
polymer chain.
4. Classiﬁcation
4.1 Polyamide materials are classiﬁed into groups in accor-
dance with their composition. These groups are subdivided into
classes and grades as shown in the Basic Property Table (Table
PA).
NOTE 3—An example of this classiﬁcation system for unreinforced
polyamide is given as follows: The designation PA0123 indicates the
following:
PA = polyamide as found in Terminology D1600,
01 (group) = polyamide 66,
2 (class) = heat stabilized, and
3 (grade) = with a minimum viscosity number of 210 and the
requirements given in Table PA.
4.1.1 Grades of reinforced or ﬁlled versions, or both, of the
basic materials are identiﬁed by a single letter that indicates the
reinforcement or ﬁller used and two digits, in multiples of 5,
that indicate the nominal quantity in percent by weight. Thus,
a letter designation G for glass reinforced and 35 for percent or
reinforcement, G35, speciﬁes a material with a nominal glass
level of 35 %. The reinforcement letter designations and
associated tolerance levels are shown as follows:
Symbol Material
Tolerance
(Based on the Total
Mass)
C carbon- and graphite-ﬁber-
reinforced
±2 %
G glass-reinforced ±2 %
L lubricants (such as PTFE,
graphite,
silicone, and molybdenum
disulﬁde)
Depends upon material
and
process—to be speciﬁed.
M mineral-reinforced ±2 %
R combinations of reinforcements or
ﬁllers, or both
±3 %
NOTE 4—An example of this classiﬁcation system for reinforced
polyamide is given as follows: The designation PA012G35 indicates the
following:
PA = polyamide as found in Terminology D1600,
01 (group) = polyamide 66,
2 (class) = heat stabilized, and
G35 (grade) = nominal 35 % glass with the requirements given in
Table PA.
NOTE 5—This part of the classiﬁcation system uses percent of rein-
forcements or additives, or both, in the callout of the modiﬁed basic
material. The types and percentages of reinforcements and additives are
sometimes shown on the supplier’s technical data sheet. If necessary,
additional control of these reinforcements and additives can be accom-
plished by use of the suffix part of the system (see Section 5).
NOTE 6—Materials containing reinforcements or ﬁllers, or both, at
nominal levels not in multiples of 5 are included in the nearest PA grade
designation. For example, a material with a nominal glass ﬁber level of
33 % is included with Grade G35 as shown in Note 5.
NOTE 7—Ash content of ﬁlled or reinforced materials is determined
using Test Method ISO 3451-4.
4.2 Variations of polyamide materials that are not in Table
PA are classiﬁed in accordance with Tables PA and A or B.
Table PA is used to specify the group of polyamide and Table
A or B is used to specify property requirements.
4.2.1 Speciﬁc requirements for variations of polyamide
materials shall be shown by a six-character designator. The
designation will consist of the letter “A” or “B” and the ﬁve
digits comprising the cell numbers for the property require-
ments in the order as they appear in Tables A and B.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org.
D6779 − 23
2

4.2.1.1 Although the values listed are necessary to include

the range of properties available in existing materials, not

every possible combination of the properties exists or can be

obtained.

4.2.2 When the grade of the basic material is not known, is

not important or does not meet the Table PA requirements, the

use of “0” grade classiﬁcation shall be used for reinforced

materials in this classiﬁcation system.

NOTE 8—An example of this classiﬁcation system for a reinforced

polyamide material is given as follows. The designation

PA0110G30A42270 would indicate the following material requirements:

PA0110 = Polyamide 66, from Table PA,

G30 = Glass reinforced at 30 % nominal,

A = Table A property requirements,

4 = Tensile strength, 140 MPa, min,

2 = Tensile modulus, 4500 MPa, min,

2 = Charpy impact, 5.0 kJ/m

, min,

7 = Deﬂection temperature at 1.8 MPa, 200°C, min, and

0 = Unspeciﬁed.

If no properties are speciﬁed, the designation would be

PA0110G30A00000.

NOTE 9—When a grade of polyamide is not fully identiﬁed by a

standard callout, it is possible to specify all table properties by the use of

an addition of Classiﬁcation D4000 suffixes. Suffix values will override

the PA table values. An example of an unreinforced polyamide material is

given as follows: PA0212KN023. This example is a general purpose, low

viscosity PA6 material where K denotes tensile properties, N denotes

tensile modulus with ISO 527 as the test method, and 023 denotes a value

of 2300 MPa. This value for tensile modulus overrides the normal table

value. This example can be applied to replace all table values, that is,

tensile stress, notched Charpy impact, and heat deﬂection temperature.

4.3 To facilitate the speciﬁcation of special materials where

the basic property table does not reﬂect the properties required,

Table B has been incorporated into this classiﬁcation system.

This table will be used in a manner similar to Table A.

NOTE 10—Pigmented or colored polyamides can differ signiﬁcantly

from the natural polymers in mechanical properties depending on the

choice of colorants and concentrations. The main property affected is

ductility, as illustrated by a reduction in Charpy impact and elongation

values. In a typical white pigmented polyamide, elongation losses of up to

50 % and Charpy impact losses of up to 30 % are common. To specify

property requirements of pigmented materials, use Table B.

NOTE 11—An example of a special material using this classiﬁcation

system is as follows: The designation PA0220B54220 would indicate the

following material requirements from Table B:

PA0220 = Polyamide 6, heat stabilized, from Table PA,

B = Table B property requirements,

5 = Tensile strength, 70 MPa, min,

4 = Tensile modulus, 2400 MPa, min,

2 = Charpy impact, 4.0 kJ/m

, min,

2 = Deﬂection temperature at 1.8 MPa, 55°C, min, and

0 = unspeciﬁed.

TABLE PA Requirements for Polyamides Dry-as-Molded

A,B

Group

Description Class Description Grade Description

Viscosity

Number,

ISO 307,

min, mL/g

Density,

ISO 1183

g/cm

Tensile

Strength,

ISO 527-1

and

ISO 527-2,

MPa, min

Tensile

Modulus,

ISO 527-1

and

ISO 527-2,

MPa, min

Charpy

Impact

Resistance,

ISO 179/

1eA, kJ/m

min

Deﬂection

Temperature,

ISO 75-1

and

ISO 75-2,

at 1.8 MPa,

°C, min

01 PA66 1 General-

purpose

1 135 1.13 to 1.15 70 2300 3.3 60

2 165 1.13 to 1.15 70 2300 3.3 60

3 210 1.13 to 1.15 70 2300 3.3 60

4 270 1.13 to 1.15 70 2300 3.3 60

5 recycled 115 1.13 to 1.15 70 2300 3.3 60

6 recycled 135 1.13 to 1.15 70 2300 3.3 60

7 115 1.13 to 1.15 70 2300 3.3 60

G15 15 % glass . . . 1.20 to 1.26 100 4000 3.0 215

G20 20 % glass . . . 1.25 to 1.33 115 5000 4.0 220

G25 25 % glass . . . 1.29 to 1.37 140 6000 5.0 225

G35 35 % glass . . . 1.35 to 1.45 170 8000 7.0 235

G40 40 % glass . . . 1.42 to 1.52 175 9000 8.0 235

G45 45 % glass . . . 1.45 to 1.55 180 10 000 9.0 240

G50 50 % glass . . . 1.51 to 1.61 190 11 000 10.0 245

M40 40 % mineral . . . 1.45 to 1.55 80 5000 2.0 100

0 other

2 Heat-

stabilized

1 135 1.13 to 1.15 70 2300 3.0 60

2 165 1.13 to 1.15 70 2300 3.0 60

3 210 1.13 to 1.15 70 2300 3.0 60

4 270 1.13 to 1.15 70 2300 3.0 60

5 recycled 115 1.13 to 1.15 70 2300 3.0 60

6 recycled 135 1.13 to 1.15 70 2300 3.0 60

G15 15 % glass . . . 1.20 to 1.26 100 4000 3.0 220

G25 25 % glass . . . 1.29 to 1.37 140 6000 5.0 225

G30 30 % glass . . . 1.32 to 1.42 160 7000 6.0 230

G35 35 % glass . . . 1.35 to 1.45 170 8000 7.0 235

G40 40 % glass . . . 1.43 to 1.53 175 9000 8.0 235

G45 45 % glass . . . 1.45 to 1.55 180 10 000 9.0 240

G50 50 % glass . . . 1.51 to 1.61 190 11 000 10.0 245

M40 40 % mineral . . . 1.45 to 1.55 80 5000 2.0 100

R20 20 % ﬁller . . . 1.23 to 1.31 70 3200 1.5 . . .

R40 40 % ﬁller . . . 1.43 to 1.53 100 5500 2.5 200

0 other

3 Nucleated 1 135 1.13 to 1.15 80 2500 2.8 60

2 165 1.13 to 1.15 80 2500 2.8 60

3 210 1.13 to 1.15 80 2500 2.8 60

D6779 − 23

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摘要：

ASTM D6779 - 23 是 ASTM 国际标准组织发布的最新版本标准，全称为“Standard Classification System for Polyamide Molding and Extrusion Materials (PA)”，即聚酰胺模塑与挤出材料的标准分类体系。该标准主要针对尼龙类塑料（PA）的命名、性能等级划分以及测试要求进行规范，内容涵盖了材料的拉伸强度、弯曲模量、冲击强度、熔点、吸湿性等关键指标，并依据不同填充物（如玻璃纤维、矿物填料）和改性类型对材料进行分类。

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