Stem Carbon
What is EPS foam?
EPS is Expanded Polystyrene Foam. Polystyrene is a polymer made from the monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum by the chemical industry. At room temperature, polystyrene is normally a solid thermoplastic, but can be melted at higher temperature for molding or extrusion, then resolidified. Styrene is an aromatic monomer, and polystyrene is an aromatic polymer.
History of Polystyrene foam:
Polystyrene was accidentally discovered in 1839 by Eduard Simon; an apothecary in Berlin, Germany. From storax, the resin of Liquidambar orientalis, he distilled an oily substance, a monomer that he named styrol. Several days later Simon found that the styrol had thickened, presumably due to oxidation, into a jelly he dubbed styrol oxide (”Styroloxyd”). By 1845 English chemist John Blyth and German chemist August Wilhelm von Hofmann showed that the same transformation of styrol took place in the absence of oxygen. They called their substance metastyrol. Analysis later showed that it was chemically identical to Styroloxyd. In 1866 Marcelin Berthelot correctly identified the formation of metastyrol from styrol as a polymerization process. About 80 years went by before it was realized that heating of styrol starts a chain reaction, which produces macromolecules, following the thesis of German organic chemist Hermann Staudinger (1881 – 1965). This eventually led to the substance receiving its present name, polystyrene. The I.G. Farben Company began manufacturing polystyrene in Ludwigshafen, Germany, about 1931, hoping it would be a suitable replacement for die cast zinc in many applications. Success was achieved when they developed a reactor vessel that extruded polystyrene through a heated tube and cutter, producing polystyrene in pellet form.
Characteristics of Polystyrene:
Pure solid polystyrene is a colorless, hard plastic with limited flexibility. It can be cast into molds with fine detail. Polystyrene can be transparent or can be made to take on various colors. It is economical and is used for producing plastic model assembly kits, plastic cutlery, CD “jewel” cases, and many other objects where a fairly rigid, economical plastic of any of various colors is desired.
Polystyrene’s most common use, however, is as expanded polystyrene (EPS). Expanded polystyrene is produced from a mixture of about 90-95% polystyrene and 5-10% gaseous blowing agent, most commonly pentane or carbon dioxide. Through the use of heat, usually stem, the solid plastic is expanded into foam.
Expanded polystyrene used to contain CFCs, but other, more environmentally safe blowing agents are now used. Because it is an aromatic hydrocarbon, it burns with an orange-yellow flame, giving off soot.
Cutting EPS foam:
Expanded polystyrene is very easily cut with a hot-wire foam cutter, which is easily made by a heated and taut length of wire, usually nichrome. The hot wire foam cutter works by heating the wire to the point where it can vaporize foam immediately adjacent to it. The foam gets vaporized before actually touching the heated wire, which yields exceptionally smooth cuts.
Polystyrene can also be cut with a traditional cutter. In order to do this without ruining the sides of the blade one must first dip the blade in water and cut with the blade at an angle of about 30º. The procedure has to be repeated multiple times for best results.
Polystyrene can also be cut on 3 and 5-axis CNC routers, enabling large-scale prototyping and model-making. Special polystyrene cutters are available that look more like large cylindrical rasps
Uses for Polystyrene:
Polystyrene, shaped and cut with hot wire foam cutters, is used in architecture models, actual signage, amusement parks, movie sets, airplane construction, aerospace and much more. Such cutters may cost just a few dollars (for a completely manual cutter) to tens of thousands of dollars for large CNC machines that can be used in high-volume industrial production.
Long Stem Carbon Fibre Dwarf Jewels
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Saxmute Saxophone Mute SAXMUTE is a very new extremely effective invention to reduce the noise level of your saxophone or clarinet. Thanks to Saxmute you can play of your instrument without disturbing your entourage.Composed of 3 elements out of flexible materials, Saxmute is placed very easily in the instrument on the level of the mouthpiece, of the neck and of the bell. Saxmute is resistant, washable, light.50% of red… |
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How Plants Grow: Plant Parts and Their Functions Are Introduced [Grades K-5] $45.00 This program discusses the growth of plants, from sprouting seeds to adult plants capable of producing food. Plant parts and their functions are also introduced. Debbie conducts some experiments to observe the sprouting of seeds and the movement of water through the stem of a plant. Roots, stems, leaves, and flowers and their functions are described. Photosynthesis and fertilization are also prese… |
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Renishaw A-5003-2286 5mm Ballx50mm Oal(M2) Ruby Styli W/Carbon Stem $128.99 Coordinate Measuring Machine Probes Type: Ruby Ball Overall Length: 50 mm Ball Diameter: 5.0 mm Thread Size: M2 Material: Carbon Fiber… |
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DeWalt 1 Crimped End Brush/Carbon Steel 1/4 Stem .020 Part No. DW4901 $9.39 1″ Crimped end brush carbon steel 1/4″ stem .012″ wireApplications:All end brushes have 1/4″ shank diameterMetal deburringWeld cleaningSurface preparationEdge blendingRust removalFeatures:Highly specified wire grades are constructed with internal holding plate to ensure consistency and safetyConstructed for even balance which provides smooth performanceWire is 100% inspected to meet demanding qual… |
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DEWALT DW4902 1-Inch Knot End Brush/Carbon Steel 1/4-Inch Stem .020-Inch $12.24 Features: Highly specified wire grades are constructed with internal holding plate to ensure consistency and safety. * Constructed for even balance which provides smooth performance. * Wire is 100% inspected to meet demanding quality specifications…. |
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Carbon Fiber Tire Valve Caps $21.95 This is a brand new high-quality product…. |
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LP CARBON MIRROR PAIR 55MM $119.99 … |
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LP CARBON MIRROR PAIR 120MM $119.99 … |
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CASUS UNIFESTO – The Truth That Set Us Free $3.99 The “Inspiracy” of Casey O Cofer The solutions to Humankind’s most urgent challenges. The concise answers provided herein invite the reader to unite with his fellow man in an egalitarian revolution of elegant Constructivism. Rather than force the reader to accept my conclusions, I have tried to invite YOU to simply read my proposals and investigate further. This Synthesis Of Solutions … |
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Carbon concentration variations in the roots, stem and crown of mature Pinus pinaster (Ait.) [An article from: Forest Ecology and Management] $8.95 This digital document is a journal article from Forest Ecology and Management, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.Description: Stands of maritime pine (Pinus pinaster Ait.) cover about one million hectares of land in south-western France and produce 19%… |
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Dogwood Stem $6.15 Dogwood Stem |
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On The Main Stem $12.99 On The Main Stem |
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Stem Cells $22.99 Stem Cells |
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Stem Extension $6.27 Stem Extension |
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STEM-KIT-PW – Murray Feiss – STEM-KIT-PW > Pendant Stems $4.99 Pendant stem |
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Steering Stem $209.99 Houser Racing Steering Stem Includes adjustable stem bottom Clamp sold separately |
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ShowStopper Stem Nut Cover $23.99 ShowStopper Stem Nut Cover |
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Flower with Stem/Leaves Charm $12 Flower with Stem/Leaves Charm |
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Rose with Stem Charm $12 Rose with Stem Charm |
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VOL. 4-MAIN STEM (Live) $10.99 VOL. 4-MAIN STEM (Live) |
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Hot/Cold Stem 3Z-6H/C $2.07 Hot/Cold Stem 3Z-6H/C |
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Cold Stem 7E-1C $7.95 Cold Stem 7E-1C |
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Hot Stem 2K-2H $2.91 Hot Stem 2K-2H |
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Hot Stem 1C-6H $4.45 Hot Stem 1C-6H |
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Hot Stem 4S-2H $4.13 Hot Stem 4S-2H |
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Cold Stem 1H-1C $3.29 Cold Stem 1H-1C |
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Cold Stem 2L-1C $5.95 Cold Stem 2L-1C |
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Diverter Stem for Fisher Pfister $8.16 Diverter Stem for Fisher Pfister |
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Hot/Cold Stem 10I-7H/C $6.56 Hot/Cold Stem 10I-7H/C |
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Hot/Cold Stem 2H-1H/C $2.06 Hot/Cold Stem 2H-1H/C |
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Hot Stem 9B-3H $4.3 Hot Stem 9B-3H |
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Hot Stem 2L-4H $3.73 Hot Stem 2L-4H |
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Hot/Cold Stem 6Z-82H/C $4.55 Hot/Cold Stem 6Z-82H/C |
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Hot Stem 2J-3H $4.65 Hot Stem 2J-3H |
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Hot/Cold Stem 3H-8H/C $2.99 Hot/Cold Stem 3H-8H/C |
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Cold Stem 2L – 4C $3.73 Cold Stem 2L – 4C |
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Cold Stem 2K – 2C $2.91 Cold Stem 2K – 2C |
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Hot Stem 5A-1H $4.72 Hot Stem 5A-1H |