Polymer Tech

Meterological Ballons Weather balloons  are typically teardrop shaped rubber enclosure about two meters in diameter filled with sufficient helium to loft an instrument package to very high atmospheric levels. Data on the pressure, temperature and humidity are collected during its ascent.Winds are calculated from the measured position of the balloon during its ascent. The balloon grows larger as it reaches lower and lower atmospheric  pressures until it finally bursts after expanding to six meters or more in diameter. The Instrument package for  weather balloons has evloved over time into a smaller unit with better sensors,now typically with a mass of only a few hundred grams depending on the model  and features.This package was originally called a radio Meteorograph  but is now referred to as a radiosonde. Radio for the battery powered transmitter that sends atmospheric data back to earth as the ballon ascends and sonde for the meterological ...

Calcium carbonates may be considered as materials of two families.  One is natural calcium carbonate, a ground limestone, used as diluents to reduce compound cost. The particle diameter is relatively large, ranging from 1 to 5µm, and bulk density is low. Ground calcium carbonates generally mix easily into rubber. Good dispersion is obtained even at very high loadings, up to 200 phr, without significant increases in compound viscosity. Although ground calcium carbonates reduce cost, the magnitude of the practically important volume cost reduction is limited because of the high specific gravity.  The other  family is precipitated calcium carbonate. Limestone is burned in a kiln driving off carbon dioxide gas and leaving calcium oxide. The carbon dioxide gas is transferred to a calcium oxide suspension to form calcium carbonate again. The resulting carbonates are filtered, dried, ground and separated by size. The particle size of precipitated ...

Difference between Neoprene and Chloroprene Chloroprene  Rubber Neoprene Rubber. Chloroprene  is the common name for the organic compound  2-chlorobuta-1,3-diene, which has the formula CH 2 =CCl−CH=CH 2 .  Neoprene is same as the chloroprene which is nothing but the brand name of Dupont. chloroprene is the general chemical name Marketed by dupont in 1938 Chloroprene is represented by the CR Neoprene is produced by free radical polymerization of chloroprene. Chloroprene Rubber is marketed in various brands now like Denkaprene(Denka), Bayprene(Lanxess) Various grades of Neoprene are available based on crystallization,Mooney ,Gel content. Difference between AEM and ACM Rubber  AEM Rubber ACM Rubber Ethylene Acrylic Elastomer Polyacrylic Elastomer or alkyl acrylate copolymer Application...

                                                  Introduction  A  dry suit  or wet  suit  provides the wearer with environmental protection by way of  thermal insulation  and exclusion of water, and is worn by  divers,   boaters,   water sports enthusiasts , and others who work or play in or near cold or contaminated water.       Rubber Wet Suit     A rubber wet suit is generally made of foamed neoprene rubber which is worn by water sports persons like surfers, divers, windsurfers, canoeists etc. Accordingly, they are known as rubber swim suit, rubber surf suit, rubber diving suit and so on.           This type of rubber suit provides thermal insulation, abrasion resistance and buoyancy. The insulation properties are dependen...

 PROTECTIVE CLOTHING  Protective clothing  is clothing worn to shield those who work with chemicals from the effects of  chemical hazards  that can cause  injuries on the job and other types An important field of applications for non-inflated fibre reinforced materials are different kind of safety suits and hoods, which are to protect e.g. against chemical, biological or nuclear hazards. Naturally this kind of reinforced can be used as water protecting suits, as raincoats and diving suits etc.  The customer organisations for this kind of products may be for instance e mergency services, military and general protection, nuclear or chemical industry, pharmaceutical industry, food processing industry, medical services, hazardous material handlers, or industrial safety authorities. Types of Rubber Suits A rubber suit is available in many forms and types for varied uses ranging from industrial use to sports, especially water spor...

OIL BOOM Oil boom is an important equipment that was adapted for use on the sea or other water to control oil spill.It is specially adapted for permanent installation on open seas, bays, harbors and docks.It can be used in oil spill response. The rubber boom is made of double strength synthetic fiber cloth which is covered with good quality synthetic rubber. It is oil-resisting, wear-resisting, seawater-resisting, and ultraviolet ray ageing-resisting. The unique configuration of floats has great buoyancy reserve, and high intensity and stability. Universal connectors make quick and reliable connection impossible. The surface of the boom is convenient to guide split oil and to be cleaned . 1.      Solid float PVC boom is fabricated with bright-colored high-strength PVC cloth with good oil resistance, sunlight and a long service time. 2.      Solid floats with greater reserve of buoyancy, vertical stability and oil resistance. ...

VITON B Viton B is a fluoroelastomer terpolymer of the “B- family” from DuPont Dow Elastomers. It has better fluid resistance, and retains flexibility better after dry heat aging than polymers of the Viton A family. It is recommended for applications requiring maximum retention of elastic properties combined with good mechanical properties. A low viscosity analog of Viton B, identified as Viton B-50, is also available. Viton B - Technical data sheet www.chemours.com Viton A 100- TDS

RUBBER BULLETS:  Rubber Bullets An offbeat military application of rubber is the use of rubber bullets as non-lethal weapons.  Peace-keeping missions involving crowd control, as well as military prison duty, often require the use of non-deadly force.  In military parlance, the function of these and other non-lethal weaponry is ‘to incapacitate personnel and material, while minimising fatalities, permanent injuries to personnel, and undesired damage to property and the environment’ Civilian police and security services employ rubber-coated metal bullets, plastic (e.g., PVC or polymethyl methacrylate) bullets, and beanbags filled with lead pellets for riot control and personnel protection. However, rubber bullets generally cause less injury than other nonlethal rounds. The misuse of nonlethal weaponry is a paramount legal issue Rifles, grenades and a variant on the clay more mine are used by the military to spray nonlethal rubber pellets.  The polymers used...

Standard Test Methods for Rubber Hose for Automotive Air and Vacuum Brake System. Scope of testing: These test methods are intended for use in testing the conventional types of hose employed for the operation of air  brake and vacuum brake systems, either on a single motor vehicle or as connecting or transmission lines in a combination of vehicles.  The hose may be assembled with suitable metal couplings or may be as fabricated for use with detachable fittings. Purpose of testing The purpose of these test methods are to provide nationally recognized test methods for air brake and vacuum brake hose, in particular the hose specifications SAE J1402 and SAE J1403, and to provide producers, distributors, and users with a basis for evaluating the characteristics of these hose products. ASTM D 622-99