|
Kydex
Kydex is a line of thermoplastic acrylic- polyvinyl chloride materials manufactured by Sekisui SPI. It has a wide variety of applications, including for aircraft bulkheads, firearm holsters, and sheaths. A similar acrylic polyvinyl chloride material (IPK Acrylic-polyvinyl chloride) is manufactured by Emco Plastics and Interstate Plastics, which carries nearly identical properties with an added layer for screen printing. Kydex has become a generic trademark, and often refers to any material of a similar composition. Development Kydex sheet was originally produced in 1965 by Rohm and Haas, having been designed for use in aircraft interiors. In 1987, the product line was purchased by Kydex, LLC, formerly Kleerdex Company, LLC, which manufactures the material under the name Sekisui SPI at a location in Bloomsburg, Pennsylvania. In April 2020, the company was renamed Sekisui Kydex, LLC. Characteristics It is an acrylic-polyvinyl chloride composite engineered for thermoforming fab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IPK Acrylic-polyvinyl Chloride
IPK Acrylic-polyvinyl chloride (IPK, IPK Acrylic PVC, IPK Thermoformable Sheet, IPK Kydex) is a line of thermoplastic acryl group, acrylic-polyvinyl chloride composite material. It has a chemical structure similar to Kydex with an Acrylic-polyvinyl chloride substrate and white cap for screen printing onto the material. Kydex sheet was originally produced in 1965 by Rohm and Haas, having been designed for use in aircraft interiors. In recent years, Kydex has gained a hobbyist following for a wide variety of applications, including firearm holsters and Scabbard, sheaths for knife, knives. IPK Acrylic-polyvinyl chloride was developed by Interstate Plastics in 2012 and sold under the registered trademark IPK. Interstate Plastics claims the material offers an alternative to thermoformable plastic sheets while providing a printable surface for custom designs and patterns. Most vinyl sign print shops are able to print custom designs or patterns onto the material. IPK is currently the only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kydex Knife Sheath
Kydex is a line of thermoplastic acrylic- polyvinyl chloride materials manufactured by Sekisui SPI. It has a wide variety of applications, including for aircraft bulkheads, firearm holsters, and sheaths. A similar acrylic polyvinyl chloride material (IPK Acrylic-polyvinyl chloride) is manufactured by Emco Plastics and Interstate Plastics, which carries nearly identical properties with an added layer for screen printing. Kydex has become a generic trademark, and often refers to any material of a similar composition. Development Kydex sheet was originally produced in 1965 by Rohm and Haas, having been designed for use in aircraft interiors. In 1987, the product line was purchased by Kydex, LLC, formerly Kleerdex Company, LLC, which manufactures the material under the name Sekisui SPI at a location in Bloomsburg, Pennsylvania. In April 2020, the company was renamed Sekisui Kydex, LLC. Characteristics It is an acrylic-polyvinyl chloride composite engineered for thermoforming fab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Handgun Holster
A handgun holster is a device used to hold or restrict the undesired movement of a handgun, most commonly in a location where it can be easily withdrawn for immediate use. Holsters are often attached to a belt or waistband, but they may be attached to other locations of the body (e.g., the ankle holster). Holsters vary in the degree to which they secure or protect the firearm. Some holsters for law enforcement officers have a strap over the top of the holster to make the handgun less likely to fall out of the holster or harder for another person to grab the gun. Some holsters have a flap over the top to protect the gun from the elements. Function Holsters are generally designed to offer protection to the handgun, secure its retention, and provide ready access to it. The need for ready access is often at odds with the need for security and protection, so users must consider their needs. Choosing the right balance of security and availability can be very important, especially i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elastic Modulus
An elastic modulus (also known as modulus of elasticity) is the unit of measurement of an object's or substance's resistance to being deformed elastically (i.e., non-permanently) when a stress is applied to it. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region: A stiffer material will have a higher elastic modulus. An elastic modulus has the form: :\delta \ \stackrel\ \frac where stress is the force causing the deformation divided by the area to which the force is applied and strain is the ratio of the change in some parameter caused by the deformation to the original value of the parameter. Since strain is a dimensionless quantity, the units of \delta will be the same as the units of stress. Specifying how stress and strain are to be measured, including directions, allows for many types of elastic moduli to be defined. The three primary ones are: # ''Young's modulus'' (E) describes tensile and compressive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SCA Armoured Combat
SCA armoured combat, or informally heavy combat, is a combat sport developed by the Society for Creative Anachronism (SCA) in which participants in protective body armour compete in mock combat, individual tournaments inspired by forms of historical combat, and tournament combat practiced in medieval Europe. Groups also compete, under supervision, in group battles which may approximate historically real combat, using SCA approved safe weapons. Combats are performed under the watch of marshals to maintain safety. It is variously considered a combat sport, contact sport, or a form of martial art. The slang term "heavy" is used to distinguish this from "light" combat, now almost exclusively referred to as rapier combat. Participants use armour and weapons specified by SCA standards and rules. Weapons are made from rattan rather than steel for added safety.Corkill, Eda "Urban warfare medieval style: Fighters take up arms the old European way" Japan Times, Sep 20, 2009Martell, Chris, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Society For Creative Anachronism
The Society for Creative Anachronism (SCA) is an international living history group with the aim of studying and recreating mainly Medieval European cultures and their histories before the 17th century. A quip often used within the SCA describes it as a group devoted to the Middle Ages "as they ought to have been", choosing to "selectively recreate the culture, choosing elements of the culture that interest and attract us". Founded in 1966, the non-profit educational corporation has over 20,000 paid members as of 2020 with about 60,000 total participants in the society (including members and non-member participants). History The SCA's roots can be traced to a backyard party of a UC Berkeley medieval studies graduate, the author Diana Paxson, in Berkeley, California, on May Day in 1966. The party began with a "Grand Tournament" in which the participants wore helmets, fencing masks, and usually some semblance of a costume, and sparred with each other using weapons such as plywood ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rapid Prototyping
Rapid prototyping is a group of techniques used to quickly fabricate a scale model of a physical part or assembly using three-dimensional computer aided design (CAD) data. Construction of the part or assembly is usually done using 3D printing or "additive layer manufacturing" technology. The first methods for rapid prototyping became available in the mid 1987 and were used to produce models and prototype parts. Today, they are used for a wide range of applications and are used to manufacture production-quality parts in relatively small numbers if desired without the typical unfavorable short-run economics. This economy has encouraged online service bureaus. Historical surveys of RP technology start with discussions of simulacra production techniques used by 19th-century sculptors. Some modern sculptors use the progeny technology to produce exhibitions and various objects. The ability to reproduce designs from a dataset has given rise to issues of rights, as it is now possibl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rockwell Scale
The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale. When testing metals, indentation hardness correlates linearly with tensile strength. History The differential depth hardness measurement was conceived in 1908 by Viennese professor Paul Ludwik in his book ''Die Kegelprobe'' (crudely, "the cone test"). The differential-depth method subtracted out the errors associated with the mechanical imperfections of the system, such as backlash and surface imperfections. The Brinell hardness test, invented in Sweden, was developed earlier – in 1900 – but it was slow, not use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UL 94
UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. The standard determines the material’s tendency to either extinguish or spread the flame once the specimen has been ignitedUL-94is now harmonized with IECbr>60695-11-10an60695-11-20and ISObr>9772an The VW-1 (vertical wire burn) rating is sometimes erroneously associated with UL 94, but it (and some other flammability tests) is described by UL 1581 (Reference Standard for Electrical Wires, Cables, and Flexible Cords). Classifications From lowest (Least flame-retardant) to highest (Most flame-retardant): *HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm or burning stops before 100 mm *V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed. *V-1: burning stops within 30 seconds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Generic Trademark
A generic trademark, also known as a genericized trademark or proprietary eponym, is a trademark or brand name that, because of its popularity or significance, has become the generic term for, or synonymous with, a general class of products or services, usually against the intentions of the trademark's owner. A trademark is said to become ''genericized''—or, informally, to have suffered ''genericide''—when it begins as a distinctive product identifier but changes in meaning to become generic. This typically happens when the products or services which the trademark is associated with have acquired substantial market dominance or mind share, such that the primary meaning of the genericized trademark becomes the product or service itself rather than an indication of source for the product or service. A trademark thus popularised has its legal protection at risk in some countries such as the United States and United Kingdom, as its intellectual property rights in the trademark ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rohm And Haas
Rohm and Haas Company is a manufacturer of specialty chemicals for end use markets such as building and construction, electronic devices, packaging, household and personal care products. Headquartered in Philadelphia, the company is organized into three business groups of Specialty Materials, Performance Materials and Electronic Materials, and also has two stand-alone businesses of Powder Coatings and Salt. Formerly a Fortune 500 Company, Rohm and Haas employs more than 17,000 people in 27 countries, with its last sales revenue reported as an independent company at US$8.9 billion. Dow Chemical Company bought Rohm and Haas for $15 billion in 2009. History The company was founded in Esslingen, Germany, by Dr. Otto Röhm and Mr. Otto Haas in 1907. Haas moved to Philadelphia and began the American side of the business on September 1, 1909, from an office on Front Street, while Otto Röhm remained in Germany to run a company that would eventually become Röhm GmbH. Röhm improv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermoplastic
A thermoplastic, or thermosoft plastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling. Most thermoplastics have a high molecular weight. The polymer chains associate by intermolecular forces, which weaken rapidly with increased temperature, yielding a viscous liquid. In this state, thermoplastics may be reshaped and are typically used to produce parts by various polymer processing techniques such as injection molding, compression molding, calendering, and extrusion. Thermoplastics differ from thermosetting polymers (or "thermosets"), which form irreversible chemical bonds during the curing process. Thermosets do not melt when heated, but typically decompose and do not reform upon cooling. Above its glass transition temperature and below its melting point, the physical properties of a thermoplastic change drastically without an associated phase change. Some thermoplastics do not fully crystallize ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
