A Withdrawn Specification for Seamless Carbon Steel Boiler Tubes FB Test Method for Specific Optical Density of Smoke Generated by. Test according to ASTM E Standard Test 6, 28, 2 3. Specific optical density. 0, 1, 0, 2, 1, 8, 3, 7, Astm F 83 Pdf 13 DOWNLOAD. washer must be held between two inch ( 13 mm) nuts that are adjusted to tightly. (ASTM) Standard Test Method ASTM.
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The compositions can further f184-83 good melt viscosities, which aids processing. In a specific embodiment the dihydroxy aromatic compound is of formula 5more specifically dihydroxy aromatic compound 5 containing no additional halogen atoms.
In some embodiments a combination of two or more different poly siloxane copolymers, in particular two or more different poly siloxane-carbonate s are used to obtain the desired properties.
The impact of replacing the poly siloxane-carbonate with other silicone-containing additives was also investigated and the results shown in Table In an embodiment, each R 1 is a divalent aromatic group, for example derived from an aromatic dihydroxy compound of formula 4: Bruised Beaten and Wet. Specific examples of bisphenol compounds that can be represented by formula 3 include 1,1-bis 4-hydroxyphenyl methane, 1,1-bis 4-hydroxyphenyl ethane, 2,2-bis 4-hydroxyphenyl propane bisphenol A or BPA2,2-bis 4-hydroxyphenyl butane, 2,2-bis 4-hydroxyphenyl octane, 1,1-bis 4-hydroxyphenyl propane, 1,1-bis 4-hydroxyphenyl n-butane, 2,2-bis 4-hydroxymethylphenyl propane, 1,1-bis 4-hydroxy-t-butylphenyl propane, 3,3-bis 4-hydroxyphenyl phthalimidine, 2-phenyl-3,3-bis 4-hydroxyphenyl phthalimidine PPPBPand 1,1-bis 4-hydroxymethylphenyl cyclohexane DMBPC.
Combinations of different brominated epoxy oligomers can be used. In another embodiment, polydiorganosiloxane units are derived from polysiloxane bisphenols of formula Polycarbonate-polysiloxane copolymer compositions for mobile phone housing applications.
The polycarbonate compositions can further have excellent impact strength, particularly when the average value of E is higher, i. Heat deflection temperature was measured on an annealed 3. As discussed above, the polycarbonate compositions are formulated to meet strict flammability requirements. Certain polycarbonate-polyetherimide blends also have low melt flow, but can be difficult to formulate so as to provide bright white compositions.
Astm F 83 Pdf 13
Excellent transparency can also be obtained when the polycarbonate composition comprises the first polycarbonate in an amount effective to provide at least 0. Title 14 Part 25 Atm I. Without being bound by theory, it is believed that the unexpected combination of low smoke density and low heat release values are obtained by careful selection and balancing of the absolute and relative amounts f8148-3 the first, second, and optionally third polycarbonates, including selecting an amount of first polycarbonate and the block size of the siloxane blocks in the first polycarbonate to provide at least 0.
In an embodiment, the polycarbonate compositions f81-483 a first polycarbonate certain poly siloxane-carbonate s as further described belowa second polycarbonate certain brominated polycarbonates as further described belowand optionally a third polycarbonate different from the first and the second polycarbonates, in amounts effective to satisfy at least the smoke generation requirements of the American Society for Testing and Materials ASTM standard E Transesterification catalysts include tetrabutylammonium aatm, methyltributylammonium hydroxide, tetrabutylammonium acetate, tetrabutylphosphonium hydroxide, tetrabutylphosphonium acetate, tetrabutylphosphonium phenolate, or a combination comprising at least one of the foregoing.
The Mw is about 30, Daltons. Polycarbonate copolymers with ester units, known as poly ester-carbonate s and polyester-polycarbonates are selected so as to not significantly adversely affect the desired properties of the polycarbonate composition, in particular low smoke density and low heat release, as well as other properties such as stability to UV light. Aircraft component comprising flame retardant compositions and methods of manufacture.
Compounds are described using standard nomenclature. A combination of additives can be used. Suitable aliphatically unsaturated monohydric phenols included, for example, eugenol, 2-allylphenol, 4-allylphenol, 4-allylmethylphenol, 4-allylphenylphenol, 4-allylbromophenol, 4-allylt-butoxyphenol, 4-phenylallylphenol, 2-methylpropenylphenol, 2-allyl-4,6-dimethylphenol, 2-allylbromomethylphenol, 2-allylmethoxymethylphenol, and 2-allyl-4,6-dimethylphenol.
The first, second, optional third, and optional additional polycarbonates, as well as the TBBPA copolymer and brominated polycarbonate oligomer have repeating structural carbonate units of formula Siloxane-polyestercarbonates have low melt flow and good color stability to indoor light, but may shift in color upon exposure to UV light.
Dell stylized as DELL is an American multinational computer technology company based in Round Rock, Texas, United States, that develops, sells, repairs, and supports computers and related.
Combining the results from the various Tables shows achieving the targeted density maximum of 1. The compositions therefore include amounts of the first and second polycarbonates or as described below, other brominated oligomer effective, i.
Govmark Fire & Flammability Test Instruments
The bridging group Y 1 can be a hydrocarbon group, specifically a saturated hydrocarbon group such as methylene, cyclohexylidene, or isopropylidene. Carbonate precursors include, for example, a carbonyl halide such as carbonyl bromide or carbonyl chloride, or a haloformate such as a bishaloformates of a dihydric c814-83 e.
Special Federal Aviation Regulation No. Light stabilizers are used in amounts of 0.
The siloxane blocks have an average of 5 to units, specifically 5 to units. In an embodiment, two adjacent groups e.
NBS Smoke Density Chamber, Smoke Toxicity Chamber, ASTM Smoke Density Chamber
The composition of claim 1wherein the third polycarbonate is a homopolymer with bisphenol A carbonate units. The most commonly used water immiscible solvents include methylene chloride, 1,2-dichloroethane, chlorobenzene, toluene, and the like.
Please log in asrm post a reply. The results in Table 8 show that the targeted flame and smoke properties 2-min total heat release and peak heat values of less than 65 and a smoke Dmax value of less than were achieved in polycarbonate compositions containing siloxane using the different sources of bromine as flame retardants.
Formulations with high transmission, low haze and low yellowness index values that pass OSU flame and smoke tests are particularly useful in window articles, gauge and dashboard covers and in window dust covers on aircraft. X a represents a single bond or one of the groups of formulas t814-83 or 7. Chlorides of aliphatic monocarboxylic acids with less than or equal to 22 carbon atoms are useful.
In another embodiment, the additional polycarbonate is a homopolymer with Bisphenol-A carbonate units. For example, —CHO is attached through carbon of the carbonyl group.
Polysiloxane copolymers, thermoplastic composition, and articles formed therefrom. R 2 is each independently a C 7 f814-38 30 hydrocarbon group, and. In particular, certain polysiloxane block ff814-83 and certain bromine-containing polycarbonate compositions do not, by themselves, meet strict low smoke density standards when burned.
In addition, EX 1-EX 4 all have densities below the targeted maximum density of 1. The total phosgene asm amount was g In a specific embodiment, the polydiorganosiloxane units are derived from a polysiloxane bisphenol of formula Thermoplastic polycarbonate compositions, method of manufacture, and method of use thereof.