GB/T 39714.1-2020Plastics - Polytetrafluoroethylene(PTFE) semi-finished products - Part 1: Requirements and designation (English PDF)

Foreword

GB/T 39714 "plastic polytetrafluoroethylene (PTFE) semi-finished products" is divided into two parts:

---Part 1: Requirements and naming;

---Part 2: Sample preparation and performance measurement:

This part is Part 1 of GB/T 39714:

This section was drafted in accordance with the rules given in GB/T 1:1-2009:

This part uses the redrafting law to amend ISO 13000-1:2005 "Plastic polytetrafluoroethylene (PTFE) semi-finished products Part 1

Points: Requirements and Naming:

Compared with ISO 13000-1:2005, this part is different in structure: The specific adjustments are as follows:

--- Deleted abbreviated terms and symbols (see 3:2 of the ISO 13000-1:2005 version):

Compared with ISO 13000-1:2005, there are technical differences in this part: The terms of these differences have been passed on the outer margins:

The vertical single line (|) is marked: The main technical differences and their reasons are as follows:

---Regarding normative reference documents, this section has made adjustments with technical differences to adapt to my country's technical conditions and adjustments:

The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows:

* Replace ISO 472 with GB/T 2035 which is equivalent to the international standard (see Chapter 3);

* Replace ISO 13000-2 with GB/T 39714:2 modified to adopt international standards (see Chapter 4);

* Deleted ISO 1043-1 (see Chapter 2 of the ISO 13000-1:2005 edition);

---Modified the grade classification of tensile properties of PTFE semi-finished products (see 4:3);

---Modified the classification of the electrical strength of PTFE semi-finished products (see 4:8:2 ~ 4:8:7);

--- Modify the thickness requirements of PTFE semi-finished products for electrical strength test samples (see 4:8:2 ~ 4:8:7);

---Modified some letter codes of semi-finished products (see 5:2:1);

---Added the expression of the code containing recycled resin [see 5:2:4b)];

---Added the reference standard content in Appendix A (see Appendix A [1]~[4]):

This part was proposed by the China Petroleum and Chemical Industry Federation:

This part is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC15):

Drafting organizations of this standard: Shanghai Institute of Materials, Shanghai Shanghua Fluorine Materials Co:, Ltd:, Zhejiang Jiari Fluoroplastic Co:, Ltd:, Shanghai

City Plastics Research Institute Co:, Ltd:, Zhonglan Chenguang Chengdu Testing Technology Co:, Ltd:, Luxi Chemical Group Co:, Ltd:, Liaocheng University:

1 Scope

This part of GB/T 39714 specifies the requirements and naming of polytetrafluoroethylene (PTFE) semi-finished products:

This section applies to the production of semi-finished PTFE containing up to 1% of comonomers: Teflon used to make semi-finished products

The olefin can be new material, it can be reprocessed or recycled resin: The maximum addition amount of pigments or colorants according to mass parts is 1:5%, which is also applicable

The processing conditions for different forms of unfilled PTFE products:

This section divides semi-finished products into four grades based on the difference in tensile strength and tensile breaking strain: Semi-finished products can be divided into processing type

(P type), dimensionally stable type (S type), can also be designated as electrical type (E type) or other types in different applications:

Note: Refer to Appendix A for other standard specifications on semi-finished PTFE products mentioned in this section for reference:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 2035 Plastic Terms and Definitions (GB/T 2035-2008, ISO 472:1999, IDT)

GB/T 39714:2 Plastic polytetrafluoroethylene (PTFE) semi-finished products Part 2: Sample preparation and performance determination

(GB/T 39714:2-2020, ISO 13000-2:2005, MOD)

ISO 20568-1 Plastics Fluoropolymer Dispersion Molding and Extrusion Materials Part 1: Nomenclature System and Basic Specification

(Plastics-Fluoropolymerdispersionsandmouldingandextrusionmaterials-Part 1:Designationsys-

temandbasisforspecifications)

3 Terms and definitions

The following terms and definitions defined in GB/T 2035 and ISO 20568-1 apply to this document:

3:1

Moulded basicshape

Direct sintering and compression molding, semi-finished PTFE without other processing:

3:2

Semi-finished product

Turned belts, plates, bars, tubes, pipes, molded profiles or other special-shaped products produced directly, instead of further

The final product processed and/or produced:

3:3

Turning tape skivedtape

Film or sheet processed by cutting, cutting or trimming:

Note: The term "sticky tape" is not recommended: