Thermal stability resistance

Volume reduction in service Thermal stability Resistance to oxidation, deaeration... 

Excellent thermal stability, resists creep, inherent high color Excellent processibility, poor UV resistance, brittle Excellent thermal/hydrolytic stability, poor weatherability/ impact strength... 

Since asbestos fibers are all silicates, they exhibit several other common properties, such as incombustibility, thermal stability, resistance to biodegradation, chemical inertia toward most chemicals, and low electrical conductivity. 

Abrasive wear is a complex combination of a number of factors, including resilience, stiffness, thermal resistance, thermal stability, resistance to cutting, and tearing (Smith, 1993). There are a number of laboratory tests, both international standards and commercial tests, for the evaluation of abrasive wear. The results from these tests normally represent only an indication of the actual wear that can be found in practice. The test equipment generally has a loaded sample against course abradant or, in the case of a Taber abrader, a loaded abrasive wheel against a flat sample (see Chapter 8). 

Polyphthalate carbonate Polyethersulfone Poly-4-methylpentene-l Good thermal properties, autoclavable Excellent thermal stability, resists creep UV/moisture sensitive, high crystalline melting point, lowest density o all thermoplastics... 

The commercial popularity of PFCs is primarily due to their unique physical and chemical properties, such as thermal stability, resistance to chemical degradation, repellency to water and oils, and low surface tensions [4]. Many of these properties arise because of the unique properties of fluorine [45]. 

Chemical, mechanical, and thermal stability. Resistance to both microbial degradation and swelling or dissolution in the reaction medium. High permeability to reactant and product species (and to the enzyme during the immobilization process) (pore diameters in the 10-50 nm range and porosities of 50% or better). 

Before discussing the special effects of fillers that are active fire retardants, it is useful to recognise that the addition of any particulate, non-combustible, filler to polymers can considerably affect their thermal stability, resistance to ignition and combustion, and the amount and nature of the combustion gases in terms of smoke, corrosion and toxicity. The main general effects are ... 

The Ryton polyphenylene sulphide compounds are formulated for the encapsulation of semiconductors and discrete components and are particularly suited to this application because of their excellent thermal stability, resistance to chemical environments, flame retardancy and good electrical properties over a wide temperature range. In order to be suitable for the encapsulation of microcircuits and transistors the material must have good flow during moulding, good dimensional stability, low levels of impurities and low moisture absorption characteristics. 

Manuhicturers Comments Heat curing, water-based adhesive with good thermal stability. Resistant to solvents, oils and water. High bond strength. 29% total solids. 

Phenolic resins are the primary binder for a variety of materials in the production of friction products used mainly in the automotive industry such as brake linings, brake blocks, disk pads, clutch facings, and automatic transmission blades. Phenolic resins are important in these composites due to their thermal stability, resistance to solvents and nonflammability. After some decline, the phenolic resins friction elements market has been increasing over the past three years and is now at 29 million lb. See Table 1. 

Polybenzimidazole (PBI) is a unique and highly stable linear heterocyclic polymer. The chemic structure is shown in Fig. 12.42. PBI exhibits excellent thermal stability, resistance to chemicals, acid and base hydrolysis, and temperature resistance. PBI can withstand temperatures as high as 430°C, and, in short bursts, to 760°C. It does not burn and maintains its properties as low as -196°C. 

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