ASTM D Specification for Polytetrafluorethylene (PTFE) Molding and Extrusion Materials (Withdrawn ). replaced. Buy Now. Find the most up-to-date version of ASTM D at Engineering 1 Jan Buy ASTM D Specification for Polytetrafluorethylene (PTFE) Molding and Extrusion Materials from SAI Global.
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Much of this specification is taken up with test methods for the materials as delivered by the polymer manufacturer and how the sintered material is to be tested by the end astm d1457.
This material has exceptionally good cold forming properties. It has been mandatory throughout the EU since Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. It is generally a compilation of the astj liner astm d1457 standards and includes all the common lining materials plus several more unusual types.
This specification is widely used in the Grade B form as the standard pipe material for Lined Pipe astm d1457 Fittings manufacture. The standards are published by ISO, the International Organization for Standardization, and available through National standards bodies while meeting statutory astm d1457 regulatory requirements.
Standard: ASTM D1457
Accreditation to such a standard is accomplished by a third party certifying authority astm d1457 conducts routine audits of any site wishing to hold and astm d1457 such accreditation. Quality Standards ISO These are generally US specifications.
Astm d1457 would not recommend the specification of such materials for use as pipe or fittings liners for chemical service. The specification also contains details of test methods to be used for PFA polymers. It follows the basic format of F Schedule This is a term for the internationally recognised range of x1457 wall thicknesses for carbon steel and stainless steel pipes.
Corrosion resistance especially resistance to stress corrosion cracking at elevated temperatures is determined by the molecular weight and structure of the PFA.
It does theoretically supersede all the astm d1457 liner type specifications but in practice it operates alongside the older specifications. They are called granular because of the large form of the polymer agglomerates produced astm d1457 the raw polymer finishing processes.
Testing & Certification
This raw material specification is still astm d1457 common use and is frequently referred to although it was superseded by PTFE type specifications in The term grade B determines the chemical composition and mechanical performance of the steel used to make the pipe. These are obviously relevant for this specification, but the more generic data about lining materials is much less definitive than the Qstm specifications.
Astm d1457 types of PTFE are almost always mixed with a volatile processing aid and are used to make high quality extrusions.
ISO deals with the requirements that organizations dd1457 astm d1457 meet the standard have to fulfil.
Many other user specifications use this document as a base text or astm d1457 point. It also sets the administrative procedures astm d1457 for the “conformity assessment” of pressure equipment, for the free placing on the European market without local legislative barriers. These materials which are often called fine powders are characterised by their consistent high performance, superior permeation resistance and excellent surface finish.
Grade This reference defines astm d1457 chemical composition and mechanical performance of the most ductile form of the two irons detailed in ASTM A Site Map D11457 Page. It gives details of the physical and mechanical attributes of all the common qstm of PTFE materials both before and after astm d1457. There are some differences between astm d1457 modern specification and the older series, these are mostly in the text and are astm d1457 little significance in terms of performance.
A type reference determines the mechanical and thermal properties of Page 3 astm d1457 5 a particular grade or type. These materials are astk for compression and Isostatic moulding and for Ram asrm. This specification was originally written over 30 years ago and was made up from the best parts of the manufacturing methods of the major US manufactures of that time.
Whilst the mechanical properties are important it is the thermal properties which have the most significance when PFA is used as a corrosion resistant lining material. Astm d1457 asmt is used in the fabrication of atsm pressure vessels and boilers and is used where plate materials are required astm d1457 the manufacture of pipe spool stub ends and fittings components. The standard covers physical and mechanical properties of the various grades of these polymers both astj and after sintering.
A type of PTFE is determined by its method of preparation, processing attributes, mechanical properties and the end use for which the PTFE material is required. Used as the cast housing material for many lined item such as valves, tees and elbows. The best lining materials have high molecular weights and are renowned for their extraordinarily high viscosity even when they are fully melted.
It was written r1457 for two reasons, firstly to provide a specification for the many types of lined system within a common document and secondly to regularise the various differing techniques used by the major US manufacturers. We would therefore recommend that any astm d1457 looking to write a general lined piping specification bases it upon the ASME standards.
ISO deals astm d1457 the fundamentals of quality management systems, including the eight management principles on which the family of standards is based. This is the most common standard for steel pipe and is readily recognised aetm the Petrochemical industry. Astm d1457 lower the melt flow index the greater the melt viscosity and performance in highly aggressive situations.
It has over the years been used as the bench mark quality standard for the manufacture of PTFE Lined pipe and fitting astm d1457 most of the world with only central Europe preferring the DIN equivalent.