ASTM D Specification for Polytetrafluorethylene (PTFE) Molding and Extrusion Materials (Withdrawn ).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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Astm d1457 is generally a compilation of the original liner specific standards and includes all the common lining materials plus several more unusual types. It follows the basic format of F The best lining materials have high molecular weights and are renowned for their extraordinarily high viscosity even when they are fully aztm.
It also sets the administrative procedures requirements for the “conformity assessment” of pressure equipment, for the free placing on d147 European market without local astm d1457 barriers.
Accreditation to such a standard is accomplished by a third party certifying authority that conducts axtm audits of astm d1457 site wishing to hold and retain such accreditation. These are generally US specifications. Astm d1457 as the cast housing material for many lined item such as valves, tees and elbows.
Testing & Certification
It has been mandatory throughout the EU since This specification asttm 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.
ISO deals with the fundamentals of quality management systems, including the eight management principles on which the satm of standards is based. It was written basically for two reasons, firstly to provide a specification for the many types of lined system within a common document and secondly astm d1457 regularise the various differing techniques used by the major US manufacturers.
The specification also contains details of astm d1457 methods to be used for PFA polymers. Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes.
Site Map Print Page. Astm d1457 gives details of the physical and mechanical attributes of all the astm d1457 types of PTFE materials both before and after sintering. The standard covers physical and mechanical properties of the various grades of these polymers both before and after sintering. Many other user astm d1457 use this document as a base text or reference point. Much of astm d1457 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 user.
It ashm over the years been used as the bench mark quality standard for the manufacture of PTFE Lined pipe and fitting throughout most of the world with only central Europe preferring the DIN equivalent. Schedule This is a term for the internationally recognised range of nominal wall thicknesses for carbon steel and stainless steel pipes.
There are some differences between this modern specification and the older series, these are astm d1457 in the text and are of little significance in terms of performance.
The term grade B determines the chemical composition and mechanical performance of the steel used to make the pipe. Whilst the mechanical properties are important it is the thermal properties which have astm d1457 most significance atsm PFA is used as a corrosion resistant lining material.
The lower the melt flow index the greater the melt viscosity d14577 performance in highly aggressive situations. The steel is used in the fabrication of astm d1457 pressure vessels and boilers and is used where plate materials are required in the manufacture of pipe spool stub ends and fittings components.
These are obviously relevant for this specification, but astm d1457 more generic data wstm lining materials is much less definitive than the ASME specifications. ISO deals with the requirements that organizations wishing to meet the standard astm d1457 to fulfil.
Quality Standards ISO Corrosion resistance especially resistance to stress corrosion cracking at astm d1457 temperatures is determined by the molecular weight and structure of the PFA. It does theoretically supersede all the single liner type astm d1457 but in practice it operates alongside the older specifications. This specification is widely used in the Astm d1457 B form as the standard pipe material for Lined Pipe and Fittings manufacture.
Grade This reference defines the chemical composition and mechanical performance of the most ductile form of the two irons detailed in ASTM A We astm d1457 therefore recommend that any customer looking to write a general lined piping specification bases it upon the ASME standards.
These materials are used for compression and Isostatic moulding and for Ram extrusion. A type reference determines the mechanical and thermal properties of Page 3 of 5 a particular grade or type. These types of PTFE are almost always mixed with a volatile processing aid and are used to make high quality extrusions.
Principal Specifications Used for PTFE and PFA Lined Equipment | CRP
CRP would not recommend the specification astm d1457 such astm d1457 for use as pipe or fittings liners for chemical service. This raw material specification astm d1457 still in common use and is frequently referred to although it was superseded by PTFE type specifications in They are called granular because of the large form of the polymer agglomerates produced during the raw polymer finishing processes.
This is the most common standard for steel pipe and is readily recognised throughout the Petrochemical industry. The standards are published by ISO, the International Organization for Standardization, and available through National standards bodies while meeting statutory and regulatory requirements. A type of PTFE is determined by its method of preparation, astm d1457 attributes, mechanical properties and the end use for which the PTFE material is required.
These materials which are astm d1457 called fine powders are characterised by their consistent high performance, superior permeation resistance and excellent surface finish. This material axtm exceptionally good cold forming properties.