GB/T 34691.1-2018: Plastics -- Thermoplastic polyester (TP) moulding and extrusion materials -- Part 1: Designation system and basis for specifications

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Scope

This Part of GB/T34691 specifies the naming system for thermoplastic polyester (TP)
molding and extrusion materials. This system can serve as the basis for classification.
Thermoplastic polyester (TP) materials include homopolyesters based on polyethylene
terephthalate (PET), propylene terephthalate (PTT), butyl terephthalate (PBT),
cyclohexane dimethyl terephthalate (PCT), polyethylene naphthalate (PEN), butyl
naphthalate (PBN), and other types of thermoplastic polyesters (TP) used for molding
and extrusion, as well as multi-component copolyesters.
Different types of thermoplastic polyester materials are distinguished by a classification
system based on the specified values of characteristic properties, recommended
applications and/or processing methods, important properties, additives, colorants,
fillers, and reinforcing materials:
a) Viscosity;
b) Tensile modulus of elasticity.
This Part applies to all homopolymers and copolymers of thermoplastic polyesters. It
is applicable to materials that are typically in powder, particle, or fragmented form,
modified by colorants, additives, fillers, and other materials, as well as unmodified
materials.
This Part does not apply to saturated polyester/ester and polyether/ester thermoplastic
elastomers specified in ISO 20029.
This Part does not imply that materials with the same name necessarily have the same
properties. This section does not provide engineering data, performance data, or
processing condition data required to illustrate the special uses and/or processing
methods of materials. If necessary, these additional properties can be determined
according to the test methods specified in Part 2 of GB/T 34691.
To illustrate the special use of a certain thermoplastic polyester material or to ensure
reproducibility of processing, additional requirements can be given in character group
5.
NOTE 1: The viscosity measured with other solvents can be converted into the viscosity measured
with phenol/1,2-dichlorobenzene as the solvent using the following formula:
Phenol/1,1,2,2-tetrachloroethane (50/50) as solvent: x=0.93y+1.87
Phenol/1,1,2,2-tetrachloroethane (60/40) as solvent: x=1.20y -13.34
o-Chlorophenol as solvent: x=1.22y -10.24
Dichloroacetic acid as solvent: x=1.20y -18.07
In which:
x is the viscosity measured using phenol/1,2-dichlorobenzene (50/50) as the solvent;
y is the viscosity measured with other corresponding solvents.
NOTE 2: The viscosity measured with other solvents can be converted to the viscosity measured
with m-cresol as the solvent using the following formula:
Phenol/1,1,2,2-tetrachloroethane (50/50) as solvent: x=0.70y+5.59
Phenol/1,1,2,2-tetrachloroethane (60/40) as solvent: x=0.57y+29.22
o-Chlorophenol as solvent: x=0.85y+3.14
Dichloroacetic acid as solvent: x=0.70y+7.34
Phenol/1,2-dichlorobenzene as solvent: x=0.75y+0.96
In which:
x is the viscosity measured using m-cresol as the solvent;
y is the viscosity measured with other corresponding solvents.
3.5.2.2 For PCT, phenol/1,1,2,2-tetrachloroethane (60/40) shall be used as the solvent
to determine viscosity.
3.5.2.3 For amorphous PEN, phenol/1,1,2,2-tetrachloroethane (60/40) shall be used as
the solvent to determine the viscosity. For crystalline PEN, phenol/2,4,6-
trichlorophenol (60/40) was selected as the solvent to determine the viscosity.
3.5.2.4 For PBN, phenol/1,1,2,2-tetrachloroethane (60/40) shall be used as the solvent
to determine viscosity.
3.5.2.5 For other TP homopolymers and copolymers, m-cresol is preferred as the
solvent.
3.5.2.6 Divide the viscosity into 8 ranges based on possible values. Each range is

Basic Data

Standard ID	GB/T 34691.1-2018 (GB/T34691.1-2018)
Description (Translated English)	Plastics -- Thermoplastic polyester (TP) moulding and extrusion materials -- Part 1: Designation system and basis for specifications
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.20
Word Count Estimation	13,172
Date of Issue	2018-12-28
Date of Implementation	2019-11-01
Quoted Standard	GB/T 1632.5-2008; GB/T 1844.1-2008; GB/T 1844.2-2008; B/T 34691.2-2017
Adopted Standard	ISO 20028-1-2017, MOD
Regulation (derived from)	National Standard Announcement No. 17 of 2018
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration
Summary	This standard specifies the naming system for thermoplastic polyester (TP) molding and extrusion materials, which can be used as a basis for classification. Thermoplastic polyester (TP) materials include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate for molding and extrusion. (PBT), poly(ethylene terephthalate) (PCT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN) and other types of thermoplastic polyester (TP) A homopolyester of the substrate, and a multicomponent copolyester. Different types of thermoplastic polyester materials use the values ??specified for the following characteristics and recommended uses and/or processing methods, important properties, additives, colorants, fillers and reinforcements