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molding compounds

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0090436
EISBN: 978-1-62708-233-4
...Abstract Abstract Molded plastic couplings used in an industrial application exhibited abnormally brittle properties, as compared to previously produced components. The couplings were specified to be molded from a custom-compounded glass-filled nylon 6/12 resin. An inspection of the molding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0089617
EISBN: 978-1-62708-232-7
... of the mold surface was the result of localized overheating caused by splashing of molten metal on the bore surface near the spigot end. In addition, the mold-wash compound (a bentonite mixture) near the spigot end was too thin to provide the proper degree of insulation and to prevent molten metal from...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090466
EISBN: 978-1-62708-218-1
... the actuation of the parts. The failed part material was found to be degraded, as indicated by both the FTIR and DSC analysis results. This degradation likely occurred either during the compounding of the resin or during the actual molding of the parts. A significant factor in the hinge failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090442
EISBN: 978-1-62708-218-1
... (butylene terephthalate) (PBT) resin. After molding, electronic components are inserted into the sleeves, and the assembly is filled with a potting compound. A retained lot of parts, which had not cracked, were available for reference purposes. Tests and Results Conclusions Selected Reference...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001284
EISBN: 978-1-62708-215-0
...Abstract Abstract Compound bow handle risers that had failed in service and during assembly along with an unassembled riser were submitted for analysis. The risers were die cast from magnesium-base alloy AM60A. Inspection of the failed risers and metallurgical investigations conducted...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
... formulation constituents, FTIR is extremely useful in the determination of contaminant materials within the failed part material. While contamination is never an intended part of a plastic compound, its presence certainly can have a tremendous impact on the properties of the molded component. Through...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001593
EISBN: 978-1-62708-234-1
...Abstract Abstract A failure analysis was conducted on a flow-sensing device that had cracked while in service. The polysulfone sensor body cracked radially, adjacent to a molded-in steel insert. This article describes the investigative methods used to conduct the failure analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001908
EISBN: 978-1-62708-235-8
... cavities and gas holes, and most failed to meet the required mechanical properties. Heat checks are most often located on surfaces corresponding to areas in the die that are subject to high thermal stresses or where the liquid metal flows at high speeds, causing erosion of the mold or die cavity. 1...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... molds. It presents the international classification of common casting defects in a tabular form. austenitic steels cast aluminum alloys cast iron casting casting defects casting design castings centrifugal casting corrosion-resistant castings discontinuities ductile iron gravity die...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003550
EISBN: 978-1-62708-180-1
.... Rubber compounds are sometimes intentionally plasticized like PVC in order to achieve a desired level of compressibility, flexibility, and so forth while using a specific polymer as the base for the compound. Loss of these intentional plasticizers into the environment will have the same effects...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
..., and epoxy, while methyl methacrylate is the most commonly used thermoplastic mounting resin. Both thermosetting and thermoplastic materials require heat and pressure during the molding cycle, but, after curing, mounts made of thermoplastic resins must be cooled under pressure to at least 70 °C (158 °F...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006835
EISBN: 978-1-62708-329-4
...: Fast shrinkage as the molten metal cools (roughly 5% in volume for steel) Gaseous products that are trapped by the solidifying metal as they try to escape from the liquid and semisolid metal Small crevices in the mold walls, which cause the metal to tear during the stripping operation Spatter...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
...) Scabs are caused by splashing liquid metal in the mold. (e) Pits and blisters caused by gaseous pockets in the ingot. (f) Embedded scale from excessive scaling during prior heating operations. (g) Cracks with little or no oxide present on their edges when the metal cools in the mold, setting up highly...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006831
EISBN: 978-1-62708-329-4
... of fins with change in principal casting dimensions A 123 (a) Formation of fins in planes related to direction of mold assembly (precision casting with waste pattern); principal casting dimensions change Cracked or broken mold A 200 Massive projections A 210 Swells A 212...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
... thermoplastic mounting resin. Both thermosetting and thermoplastic materials require heat and pressure during the molding cycle, but, after curing, mounts made of thermoplastic resins must be cooled under pressure to at least 70 °C (158 °F), while mounts made of thermosetting materials may be ejected from...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... elements that form tough precipitates, and a brittle layer of iron nitride compounds is formed. This “white layer” should be removed by grinding or employing a second stage of the cycle with a high ammonia dissociation (75 to 80%), causing the white layer to dissolve as nitrogen diffuses toward...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001543
EISBN: 978-1-62708-218-1
... with a carbide compound, providing it with a heat-resistant material where temperatures are extremely high. Second, pistons could be of an aluminum-graphite or aluminum-boron composite, eliminating surface melting because pure aluminum has a melting point 200 F higher than the interdendritic material...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.9781627083294
EISBN: 978-1-62708-329-4
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006800
EISBN: 978-1-62708-329-4
..., age-hardening aluminum alloys, etc.), its general product form (e.g., wrought, cast, powder metallurgy, additive manufacture, etc.), and the processing method (e.g., forged, die cast, injection molded, etc.). All of these factors must be considered when the shape of a part is defined during...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003501
EISBN: 978-1-62708-180-1
..., stainless steel, age-hardening aluminum alloys, etc.), its general product form (e.g., wrought, cast, powder metallurgy, etc.), and the processing method (e.g., forged, die cast, injection molded, etc.). All of these factors must be considered when the shape of a part is defined during configuration design...