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ceramic
A ceramic (Ancient Greek: κεραμικός – keramikós, "potter's", from κέραμος – kéramos, "potter's clay") is a solid material comprising an inorganic compound of metal, non-metal or ionic and covalent bonds. Common examples are earthenware, porcelain, and brick.
The crystallinity of ceramic materials ranges from highly oriented to semi-crystalline, vitrified, and often completely amorphous (e.g., glasses). Most often, fired ceramics are either vitrified or semi-vitrified as is the case with earthenware, stoneware, and porcelain. Varying crystallinity and electron composition in the ionic and covalent bonds cause most ceramic materials to be good thermal and electrical insulators (extensively researched in ceramic engineering). With such a large range of possible options for the composition/structure of a ceramic (e.g. nearly all of the elements, nearly all types of bonding, and all levels of crystallinity), the breadth of the subject is vast, and identifiable attributes (e.g. hardness, toughness, electrical conductivity, etc.) are difficult to specify for the group as a whole. General properties such as high melting temperature, high hardness, poor conductivity, high moduli of elasticity, chemical resistance and low ductility are the norm, with known exceptions to each of these rules (e.g. piezoelectric ceramics, glass transition temperature, superconductive ceramics, etc.). Many composites, such as fiberglass and carbon fiber, while containing ceramic materials, are not considered to be part of the ceramic family.The earliest ceramics made by humans were pottery objects (i.e. pots or vessels) or figurines made from clay, either by itself or mixed with other materials like silica, hardened and sintered in fire. Later ceramics were glazed and fired to create smooth, colored surfaces, decreasing porosity through the use of glassy, amorphous ceramic coatings on top of the crystalline ceramic substrates. Ceramics now include domestic, industrial and building products, as well as a wide range of ceramic art. In the 20th century, new ceramic materials were developed for use in advanced ceramic engineering, such as in semiconductors.
The word "ceramic" comes from the Greek word κεραμικός (keramikos), "of pottery" or "for pottery", from κέραμος (keramos), "potter's clay, tile, pottery". The earliest known mention of the root "ceram-" is the Mycenaean Greek ke-ra-me-we, "workers of ceramics", written in Linear B syllabic script. The word "ceramic" may be used as an adjective to describe a material, product or process, or it may be used as a noun, either singular, or, more commonly, as the plural noun "ceramics".
Chase tactical 4s17 level IV 10x12 NIJ CERTIFIED DEA Compliant ceramic hard armor plates made in the USA by Highcom. Weight 7.2 lb each. Never inserted, never used. Single curve. Asking $380.
Date of manufacture: 08.2020
Hoping to sell this weekend. Open to offers.
I have 4 plates available.
$300 per pair.
NIJ Level III Tested
Dimensions: 9.85" x 11.8"
Thickness: .75"
Weight: 5.29 lbs
Construction: PE+Alumina (AL2O3)
Single Curve
Stand-Alone and Multi-Hit Capable
1 in. Partial Foam Edge
Polyester/Nylon Cover
5 Year Shelf Life, made June 2020
just got, not a fan of the weight/prefer LBE style. These plates are brand new unused. Website estimates 14-16 week lead time.
Cash only. Will meet to sell in Albany and other nearby towns. Serious inquires only please. Price includes both plates, not willing to sell separately.
Taken from the...
Set of 2 plates ordered, thought I was getting scammed and bought separate plates and then these came in. Would rather sell to someone who wants plates over sending back for a refund, but still want my money back so price is firm. Pick up or willing to meet up Locally. These plates are BRAND...
I have two, black, size large level IV grey ghost plates (front and back) that I picked up in a trade from a friend, but they don’t fit in my size medium carrier. These are like new and have never been worn outside the house. Asking $400 $350 OBO for the pair, or trade towards:
- Glock 43x
-...
Front plate is a lvl 4 ceramic, swimmers cut, AR500 Brand model #4401.
Rear plate is a lvl 4 ceramic, shooters cut, ar500 brand model #1155.
Both brand new. Selling for same price as AR500 is on their website but no tax and no lead time.
$400.
Will ship on your dime.
Preferred face to...
Up for sale or maybe trade is a like new plate carrier with LVL IIIA plates included. Carrier - Condor Phalanx (MSRP $89)
Plates - HESCO lvl IIIa ceramic (MSRP $190 each)
I’m looking for $300 for the whole package. Or best offer.
Details-
Front document pocket with hook and loop closure...