ASTM D Specification for Polytetrafluorethylene (PTFE) Molding and Extrusion Materials (Withdrawn ).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 specification also contains details astm d1457 test methods to be used for PFA polymers. Corrosion resistance especially astmm to stress corrosion cracking at elevated temperatures is determined by the molecular weight and structure of the PFA. Used as the cast housing material for many lined item such as valves, tees and elbows. Site Map Print Page.
ASTM D – 83 Standard Specification for PTFE Molding and Molding and Extrusion Materials
CRP would not recommend the specification of such materials for use as pipe or fittings liners for chemical service. It does theoretically supersede all the single liner type specifications but in practice it operates alongside the older specifications.
A type reference determines the mechanical and thermal properties of Page 3 of astm d1457 a particular grade or type. This specification was originally written over 30 years ago astm d1457 was astm d1457 up from the best parts of the manufacturing methods of the major US manufactures of that time.
This is the most common standard for steel pipe and is readily recognised throughout the Petrochemical industry.
These are obviously relevant for this specification, asym the more generic data about lining materials is much less definitive than astm d1457 ASME specifications. 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 to regularise the various differing techniques used by astm d1457 major US manufacturers. These materials are used for compression and Isostatic moulding and for Ram extrusion.
It has been mandatory throughout the Astm d1457 since These are generally US specifications. Whilst the mechanical properties are astm d1457 it is the thermal properties which have the most significance when PFA is used as a corrosion resistant lining material.
The standard covers physical and mechanical properties of the various grades of these polymers both before and after sintering.
It is generally a compilation of the original liner specific standards and includes all the common lining materials plus several more unusual types. The lower the melt flow astm d1457 the greater the melt viscosity and performance astm d1457 highly aggressive situations.
The standards are published by ISO, the International Organization for Standardization, and available through National standards astm d1457 while meeting statutory ast, regulatory requirements.
It has 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 astm d1457 central Europe preferring the DIN equivalent. The best lining materials have high molecular weights and are renowned for their extraordinarily high viscosity even when they are fully melted.
Adtm follows the basic format of F Accreditation 1d457 such a standard is accomplished by a third party certifying authority that conducts routine v1457 of any site wishing to hold and retain such astm d1457. We would therefore recommend that any customer looking to write a general lined piping specification bases it upon the ASME standards.
They are called granular because of the large form of astm d1457 polymer agglomerates produced during the raw polymer ast processes. These materials astm d1457 are astm d1457 called fine powders are characterised by their consistent high performance, superior permeation resistance and excellent surface finish. Much of this specification is taken up with test methods for d11457 materials as delivered by the polymer manufacturer and how the sintered material is to be tested by the end user.
ISO deals with the requirements that organizations wishing to meet the standard have to fulfil. Many other user specifications use this document astm d1457 a base text or reference point. It gives details d14577 the physical and mechanical attributes of all the astm d1457 types of PTFE materials both before and after sintering.
Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. This specification astm d1457 widely used in the Grade B form as the standard pipe material for Lined Pipe and Fittings manufacture. Quality Standards ISO A type of PTFE is determined by its method of astm d1457, processing attributes, mechanical properties and the end use for which the PTFE material is required.
This material has exceptionally good cold forming properties.