Engineering Rubber and Plastics in Use

  Aramid yarns known by the brand name Kevlar yarn from Dupont is a high-performance yarn which can sustain temperatures in the range of 250 degree Celsius, as it was initially developed by Dupont their brand name became pretty popular in the name Kevlar although its chemical name is Poly-para-phenylene terephthalamide. Para-Aramid fibres are produced by a two-step process - polymer production followed by spinning. The first step is the low-temperature-solution polymerization of diacid chlorides (e.g. terephthaloyl chloride) and diamines (e.g. para-phenylenediamine) in amide solvents. Polar solvents such as N-methyl pyrrolidone and dimethylacetamide are used as polymerization solvents; formerly, hexamethyl phosphoramide was used. The para-aramid polymer is neutralized and then isolated from the polymerization solution. Next, a 'spinning solution' is created by redissolving the polymer in concentrated sulfuric acid. This liquid crystalline solution is extruded through a spinnere...

  Why Butyl Tape is essential in PEB, Metal Buildings? Pre engineered Buildings, Metal Building systems, Steel structures are the revolution that happened in the last two decades in the building industry. Buildings are constructed in a short span of time with increased efficiency and short time. The challenges these buildings pose is the space or gaps created by the sheets, panels, gaps due to expansion or contraction and the general clearances between metal systems. Here Comes the roll of  Butyl Tapes  specially designed for PEB, Metal Buildings to seal and fill the joints, seams, lapping areas, Metal to concrete areas.  Butyl tapes  also known as  Bead mastics  has been manufactured by Centroid for the past 7 years and has been continuously improved from its properties to packing based on customer feedbacks and inputs. This is a four-part article where we will discuss the ·       Design and Manufacturing · ...

  Recycling of Silicone Rubber: Past, Present and Future: Attaining Sustainability Ever since the starting of processing of Silicone Rubber we were curious about the recycling and reuse of Silicone rubber produced in the process as nonconformance, rejections, trial material etc., When the volumes gone up the leftover pieces, non-confirmed parts, line rejections also had gone up. This created a necessity for introduction of recycling or reuse of silicone rubber profiles, Molded parts, cured rubber pieces from extruder. As Silicone Rubber is resistant to weathering, ozone, ultraviolet etc. due to its strong silicone bonds it cannot be broken on normal heat and temperature(You can read  here  for more details). Even above 250 degree Celsius makes it brittle, and on heating above that it gets converted to silicon oxide along with emitted gases of Carbon dioxide and others. The disposal of silicone can be achieved by simply burning it or heating it at higher temperatures but i...

  Why Tear strength of silicone rubber is a critical and functional property in Gaskets used in Hot air ovens, door gaskets? Silicone gaskets are the preferred gasket for hot air ovens especially ovens used in food industry, it can withstand continuous working temperature of 210 degree Celsius and upto 240 degree Celsius for shorter dwell time. We have special grades that can withstand working temperatures of 280 degree Celsius ++ but will be made against the pre order. But are you facing the issue of tearing or cutting of the gasket? or losing the compression property after a period? Are the gasket gets deformed easily? Causing power loss, material loss, production breakages? At high temperatures silicone rubber will have a slighter change in the tensile, elongation and tear strength, if you choose a low-quality filler general purpose silicone gasket over a high tear, high temperature silicone gasket this happens. The fillers used in silicone can be precipitated, fumed, aluminum t...

  Why an insulation sleeve/overhead line cover alone will not completely solve the insulation issue and outages? As you see there is a tremendous increase in the number of silicone sleeve manufacturers over the past 3 years,  Centroid  being a pioneer in the field have developed a complete solution and a number of different models for the purpose of  overhead line cover/insulation sleeve  based on their intend to use. A sleeve alone will not solve the insulation issue as proper installation of the sleeve under expert guidance is a key. Any air gaps, improper locking, non-availability of locking accessories can cause the insulation breakdown of the conductor and can cause severe damage to the sleeve, conductor and to the total system. A thorough process to be maintained in the manufacture of silicone sleeves right from the material selection to installation which we have been providing through the continuous improvements from testing, manufacturing to installatio...