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high-temperature curing silicones
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Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003692
EISBN: 978-1-62708-182-5
... deposited by evaporation of water, a class of coatings called water-borne coatings. The coatings that chemically cross link by copolymerization, including epoxies, unsaturated polyesters, urethanes, high-temperature curing silicones, and phenolic linings, are also described. hardening autooxidative...
Abstract
This article discusses the coating systems categorized by the generic type of binder or resin and grouped according to the curing or hardening mechanism inherent within that generic type. It focuses on the properties, advantages, and limitations of various autooxidative cross-linked resins, thermoplastic resins, and cross-linked thermosetting resins. The autooxidative cross-linked resins include alkyd resins and epoxy esters. The article examines the two types of coatings based on thermoplastic resins: those deposited by evaporation of a solvent, commonly called lacquers, and those deposited by evaporation of water, a class of coatings called water-borne coatings. The coatings that chemically cross link by copolymerization, including epoxies, unsaturated polyesters, urethanes, high-temperature curing silicones, and phenolic linings, are also described.
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005672
EISBN: 978-1-62708-198-6
... (−58 to 390) Tensile strength High High High Medium Low Elongation/flexibility Low Medium Low High Very high Hardness Rigid Semirigid Rigid Soft Soft Number of components 1 1 1 or 2 2 1 or 2 Cure type/temperature Room temperature Ultraviolet/visible Room...
Abstract
This article provides an overview of curing techniques, adhesive chemistries, surface preparation, adhesive selection, and medical applications of adhesives. The curing techniques are classified into moisture, irradiation, heat, and anaerobic. The article highlights the common types of curable adhesives used for medical device assemblies, including acrylics, cyanoacrylates, epoxies, urethanes, and silicones. Other forms of adhesives, such as hot melts, bioadhesives, and pressure-sensitive adhesives, are also discussed. The typical characteristics and applications of biocompatible medical device adhesives are listed in a table. The article concludes with a section on the selection of materials for medical adhesives.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003048
EISBN: 978-1-62708-200-6
.... Silicones shrink very little upon curing and are available as single-component moisture-cured versions (room-temperature vulcanizing, or RTV) or as faster-curing two-component versions. High elongation (≤1000%) construction sealants with the highest joint movement capability are formulated from silicones...
Abstract
This article is an informative primer on sealants and the role they play in engineered assemblies. It discusses the physical, thermal, chemical, and electrical properties of sealant materials and the various forms in which they are applied, including liquids, pastes, and extruded tapes. It also describes classifications and types, comparing and contrasting sealants made from oil-based caulks, asphalts, coal tar resins, latex acrylic sealants, polyvinyl acetate caulks, solvent acrylics, butyl sealants, polysulfides, polyurethanes, modified silicones, anaerobics, vinyl plastisols, and polypropylenes. In addition, the article provides practical design insight, addressing application requirements, seal configurations, and joint stresses. It concludes with a brief discussion on the use of sealants in aerospace, automotive, electrical, and construction applications.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003047
EISBN: 978-1-62708-200-6
...: Hybrids: Rubber-toughened epoxy, silicone, high-temperature polymers Thermoset polymers: Epoxy, phenolic, polyester, acrylic Rubbery thermosets: Polyether urethanes, polyester urethanes Thermoplastics: Polyamide, polyester Elastomers: Neoprene, nitrile rubber, styrene-butadiene block...
Abstract
This article begins with an overview of the fundamentals of adhesive technology, including functions, limitations, adhesive joint types, and the key factors in the selection of adhesives, including application, type of joint, process limitation, mechanical requirement, and service conditions. It then focuses on the characteristics, types, and properties of the five groups of adhesives, such as structural, hot melt, pressure sensitive, water based, ultraviolet, and electron beam cured adhesives. The article also discusses the functions and applications of adhesive modifiers, including fillers, adhesion promoters, tackifiers, and tougheners. It gives a short note on functions of primers and primerless bonding. Applications of adhesives in automotive, aerospace, electronics, electrical, medical, sports, and construction sectors are also described. Finally, the article describes the steps in adhesive bonding, including storage and handling of adhesives, bonding preparation, adhesive application, tooling, and curing.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006028
EISBN: 978-1-62708-172-6
.... Industrial Maintenance Coatings The expansion of the utility of silicone resins beyond high-temperature paint was driven by economic and performance considerations. Coatings based solely on silicone resins were relatively costly, required extended thermal cure, and possessed less than optimal physical...
Abstract
This article focuses on those areas of coatings technology where silicon-based technology (SBT) is the primary enabling technology and where SBT is used as an additive to provide unique properties to the coating film. It describes the chemistry and the uses of alkoxy silanes. The uses of silicates, siliconates, silicone fluids, and silicone resins in coatings are reviewed. The article discusses the various applications of SBT, namely, primers, heat-resistant coatings, industrial maintenance coatings, hygienic coatings, and abrasion-resistant coatings, and for marine biofouling control. It also provides information on the benefits of silicon-base additives.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006029
EISBN: 978-1-62708-172-6
... to high temperatures resulting in lower film integrity. Combining the rapid cure and excellent barrier properties of epoxy resins with the thermal and UV stability of silicon-based materials, formulators created high-performance coatings with excellent resistance to corrosion and chemical attack, as well...
Abstract
This article focuses on technologies in the protective coatings field, namely, polysiloxane hybrids and related materials. Industrial maintenance topcoats, including silicone alkyds, silicone epoxies, and polysiloxanes are reviewed. The article discusses two major application areas of protective coatings, namely, architectural coatings and automotive clear coats.
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003405
EISBN: 978-1-62708-195-5
.... 4 and 5 . The curing cycle for cauls laid up on curing tool with waxed part model buildups is shown in Fig. 6 . Cauls fabricated on part models that can withstand temperatures as high as 175 °C (350 °F) is shown in Fig. 7 . Cauls cured at low temperature are postcured unrestrained in an oven...
Abstract
Elastomeric tooling uses rubber details to generate required molding pressure or to serve as a pressure intensifier during composite part curing cycles. This article discusses the various aspects of the forms of commercially available bag-side elastomeric caul systems. It describes the two basic methods, such as the trapped or fixed-volume rubber method and the variable-volume rubber method, of elastomeric tooling, which use the principles of thermal expansion molding. The significant properties and controlling equations that are required to characterize elastomeric tooling material are also discussed.
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002465
EISBN: 978-1-62708-194-8
... Molding by Injection, Extrusion, or Reaction Injection Preform flow-die molding by injection, extrusion, or reaction injection uses a preform of fiber or fabric in a resin matrix that is forced through a forming die at high pressure and high temperature and then is cured. Fiber orientation...
Abstract
This article describes the interaction of composition, manufacturing process, and composite properties of composites. The manufacturing process includes resin-matrix, metal-matrix, and carbon/carbon matrix processing. The article discusses various mechanical properties of composites. It explores how variations in the composition, manufacturing, shop process instructions, and loading/environmental conditions can affect the use of a composite product in a performance/service life operation.
Book Chapter
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003786
EISBN: 978-1-62708-177-1
... is fragile. Control of temperature is more critical than control of pressure. A certain minimum temperature must be exceeded in all cases, although this is, to some extent, dependent on the curing time allowed in the case of thermosetting plastics. Excessively high temperatures result in charring...
Abstract
Mounting of the specimen is often desirable or necessary for handling and metallographic polishing after the specimen is cut into an appropriate size. This article illustrates the different mechanical clamps used in mounting small specimens. It provides useful information on compression molded mounts, which are molded with thermoplastic and thermosetting resins. The article reviews several resins and their key factors, which help in the selection of the most appropriate mounting method and resin. It also discusses the characteristics of plastic mounting materials. The article provides information on the molds and resins used for castable mounts, vacuum treatment of mounts, special mount arrangements, and mount marking and storage.
Book Chapter
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003412
EISBN: 978-1-62708-195-5
..., polyester, or fiberglass. The fabric is treated with a release agent that must not transfer to the laminate; otherwise, subsequent bonding or painting operations may not be satisfactory. Nylon will not release from phenolics and is not satisfactory for high-temperature curing matrices, such as polyimides...
Abstract
Curing is the irreversible change in the physical properties of a thermosetting resin brought about by a chemical reaction, condensation, ring closure, or addition. This article discusses the material types and functions of various components considered in the preparation for curing. It presents a discussion on the major elements of an autoclave system, namely, pressure vessel, gas stream heating and circulation sources, gas stream pressurizing systems, loading systems, and vacuum systems. The article describes a computerized approach to the simultaneous control of materials reaction behavior and consolidation dynamics, using an autoclave as the reaction vessel.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006077
EISBN: 978-1-62708-172-6
... When the repeating unit n is 1 or less, the resin is a liquid with a honeylike consistency. These epoxies are used for high-solids, ambient-temperature-cured epoxies. When the average molecular weight of the resin is increased by increasing n to approximately 2, by adding more bisphenol...
Abstract
This article provides a detailed discussion on the principal classes and curatives of epoxy resins used in the coatings industry. The principal classes are bisphenol A epoxy, bisphenol F epoxy, epoxy phenol novolac, cycloaliphatic epoxies, epoxy acrylate, brominated bisphenol-A-based epoxy, phosphorus-containing epoxy, fluorinated epoxies, epoxy esters, epoxy phosphate esters, and waterborne epoxy. The principal curatives are amines, amine adducts, cyanoethylated amines, ketimines, polyoxyalkylene amines, cycloaliphatic amines, aromatic amines, polyamides, amido amines, and dicyandiamides. Other curatives include polyester co-polymers, phenolic co-polymers, melamine and urea formaldehyde co-polymer resins, phosphate flame retardants, ultraviolet and electron beam curing of epoxy resins, Mannich bases, Mannich-based adducts, and anhydrides. The article concludes by discussing the concerns regarding the use of epoxy coatings.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003041
EISBN: 978-1-62708-200-6
... will not release from phenolics and is not satisfactory for high-temperature-curing matrices, such as polyimides or bismaleimides, because its upper service temperature is about 177 °C (350 °F). Nylon can be used if the initial cure temperature is low and if it is removed before postcure. If there is any doubt...
Abstract
Autoclave molding is a process used to impart a controlled heat and pressure cycle cure to a layup. This article describes the materials used for preparing a layup, including peel ply, separator, bleeder, barrier, breather, dam, and vacuum bag. It describes the major elements and functions of an autoclave system, including pressure vessel, gas stream heating and circulation sources, gas stream pressurizing systems, vacuum systems, control systems, and loading systems. The article includes information about modified autoclaves for specialized applications and safety practices in autoclave molding. It also describes the tooling configuration and type of tooling which includes aluminum and steel tooling, electroformed nickel tooling, graphite-epoxy tooling, and elastomeric tooling.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003031
EISBN: 978-1-62708-200-6
... ease of manufacture. Composites reinforced with aramid fibers are also widely used for high-performance applications. Composites reinforced with other organic fibers and with boron, silicon carbide, and other ceramic fibers are used for certain specialty applications. Glass Fibers Initial...
Abstract
This article discusses the types, properties, and uses of continuous-fiber-reinforced composites, including glass, carbon, aramid, boron, continuous silicon carbide, and aluminum oxide fiber composites. While polyester and vinyl ester resins are the most used matrix materials for commercial applications, epoxy resins, bismaleimide resins, polyimide resins, and thermoplastic resins are used for aerospace applications. The article addresses design considerations as well as product forms and fabrication processes.
Book: Corrosion: Materials
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003840
EISBN: 978-1-62708-183-2
... are zirconia, thoria, silicon nitride, boron nitride, and silicon carbide. Refractories are used as lining materials for heat and mass containment in high-temperature processing equipment such as furnaces and kilns. Some typical examples are silica, alumina, chromium oxide, calcium oxide, silicon nitride...
Abstract
This article provides an overview of the environmental performance of the most commonly used nonmetallic materials, including elastomers, plastics, thermosetting resins, resin-matrix composites, organic coatings, concrete, refractories, and ceramics. It also discusses the applications and uses of these materials.
Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005354
EISBN: 978-1-62708-187-0
... methods lend themselves to high-production runs and automation, while the air-setting (liquid-cured) nobakes do not lend themselves to high-production runs. This is due to the time required to thoroughly cure the mold or core. Compared to green sand molding, one basic advantage of no-bake binding...
Abstract
No-bake sand molds are based on the curing of inorganic or organic binders with either gaseous catalysts or liquid catalysts. This article reviews the major aspects of no-bake sand bonding in terms of coremaking, molding methods, and sand processing. It discusses the points to be noted in handling sand-resin mixtures for no-bake molds or cones and lists some advantages of no-bake air-set cores and molds. The article describes the process procedures, advantages, and disadvantages of gas curing and air-setting hardening of sodium silicates. It examines the members of the air-setting organic binders, namely, furan no-bake resins, phenolic no-bake resins, and urethanes. The article provides an overview of gas-cured organic binders. It also illustrates the three commercial systems for sand reclamation: wet reclamation systems, dry reclamation systems, and thermal reclamation.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006009
EISBN: 978-1-62708-172-6
..., or homopolymerize. Although responsive to catalysis with peroxide catalysts, a complete curing reaction could be obtained only with relatively high temperatures and rather long times. These resins also were completely unlike the low-viscosity liquid unsaturated polyester (UP) resins of today (2015), because...
Abstract
This article provides a discussion on polyester coating applications such as powder coatings, can coatings, and automotive paints. It includes an overview, structure, properties, and benefits of vinyl ester resins. The article discusses the additives for both unsaturated polyester and vinyl ester coatings, namely, curing systems, thixotropic agents and fillers. It exemplifies polyester and vinyl ester coating, lining and flooring systems that are used for top-to-bottom protection of industrial plants and equipment. The article also highlights the concerns to be addressed when using polyesters and vinyl esters.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006015
EISBN: 978-1-62708-172-6
... using this binder system are characterized by good outdoor durability with the advantage of high first-pass transfer efficiency, excellent storage stability, very smooth surface, and low-temperature cure applications. Disadvantages The major disadvantage of coatings using this binder system...
Abstract
Powder coatings are widely used by manufacturers as a finish of choice to enhance the appearance and performance of their products. This article begins with a discussion on advantages and disadvantages of powder coatings. It describes the selection of coating-types and uses of powder coatings in appliance industries, furniture industries, computer industries, fixture industries, architectural industries, automotive industries, agriculture and construction equipment industries, recreational equipment industries, and general industries. Powder coating formulations consist of binder systems, pigments, extenders, and additives. The basic process flow for the manufacture of powder coatings consists of premix, extrusion, grinding, and packing. The article also provides information on application of powder coatings, including pretreatment, deposition, and curing as well as on troubleshooting, trends and challenges for the powder coatings.
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003695
EISBN: 978-1-62708-182-5
... P VG E Very low Isobutylene-isoprene (butyl) rubber IIR E E E E F F-G P VG G-E Very low Ethylene-propylene (-diene) rubber EPM, EPDM O E E G-E P-G P P-F P-G F-E Medium Silicone rubber VMQ E E E P-F P-G P-G F F G-VG High Fluoroelastomer FKM O O VG...
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003403
EISBN: 978-1-62708-195-5
...-performance advanced composite molds and fixtures has evolved from company proprietary methods to more conventional industry standards. The advent of low-temperature curing prepregs for high-temperature service has changed the course of the advanced composite tooling industry. The ability to lay-up...
Abstract
Composite tooling is the making of tools from composite materials. This article focuses on wet lay-up methods and techniques that are used to fabricate prepreg tooling. It discusses the advantages and disadvantages of composite tools. The article describes the process considerations for composite tool design, such as master model or pattern design selection, fiber and fabric selection, resins, and surface coat and ply. Various tool laminate construction techniques, such as curing and demolding, and cutting and trimming, are reviewed. The article also describes the substructure design for the construction of tool laminates.
Book: Composites
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003489
EISBN: 978-1-62708-195-5
... properties Store at 18 °C (0 °F); short shelf life; high-temperature cure; brittle and low peel strength Acrylic Two-part liquid or pastes Room to 100 (212) 105 (221) Fast setting; easy to mix and use; good moisture resistance; tolerant of surface contamination Strong, objectionable odor; limited...
Abstract
Adhesive bonding is used to assemble composite components into larger structures. Finished components that are damaged during assembly or service are often repaired with adhesive-bonding techniques. This article summarizes criteria for adhesive selection and illustrates typical secondary adhesively bonded joint configurations. It discusses the highly loaded joint considerations of adhesives. The article describes the epoxy adhesives commonly used for the bonding or repair of composite structures. It discusses the surface preparation of composites and metals, and honeycomb processing, including perimeter trimming, mechanical forming, heat forming, core splicing, contouring, and cleaning. The article presents basic steps involved in the adhesive-bonding process and concludes with a discussion on adhesive applications and tooling.