Rubber Testing Equipments
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Rubber Testing Equipment offered by us are used to test the hardness and strength of rubber. These testing equipment are easy to use and find application in rubber industry. We also offer these testing equipment to the clients in different specifications. The Rubber Testing Equipment provided by us are explained below: |
Oscillating Disc Rheometer
Our organization provides Oscillating Disc Rheometer, which is a reliable testing equipment. The processing and curing characteristics of vulcanizable rubber compounds are determined by this instrument. In a sealed test cavity under positive pressure, a test piece of rubber compound is contained and it is maintained at a specified elevated temperature. In the test piece, a Rotor (biconical disc) is embedded and through a small specified rotary amplitude, it is oscillated. On the test piece, this action exerts a shear strain and depending upon the stiffness (shear modulus) of the rubber compound, the torque (force) required to oscillate the disc is provided. During cure, when cross links are formed, the stiffness of the specimen compound increases. Based on the statistical theory of rubber elasticity, the direct proportionately posited between the cross linking density and the shear modulus is based at a constant temperature of the test. A cross linking isotherm that serves to measure the course of the cross linking reaction is the function of time of that property. Of the oscillating shear force F, the cross linking isotherm is function of time, in the context of Rheometer. Occurring at a particular temperature as a result of vulcanization, the cross linking isotherm of the Rheometer indication proportional to it. Typical graph called "Cure Curve or Rheograph" can be attained by plot of this torque (force) value against time. During cure phase i.e. curing characteristics and final shape of the curve, the initial trough that is processing behavior of the compound can be monitored. In order to describe a graph, Internationally designated parameters like MI, MH, TS2, MI, MH, TS5, TC50, TC90 are used. The Cure Curve is a finger print of processing character & compound's vulcanization. Application: The compounded rubber must be of consistent quality to produce superior quality rubber product. The process of mixing varies due to the following factors: - Machinery variation
- Ingredients variations
- Man variation
- Batch to batch variation as the compound is mixed in batches
With reference to Rheological parameters, it is possible to workout in a large sample size, the range, mean & standard deviation and upper & lower control limits, if randomly selected batches are subjected to Rheometeric analysis. Depending upon the quality control limits, each batch on testing can be classified in Pass/Fail criteria. Moreover, Statistical Quality Control(SQC) can be based on this analysis. Quality control gates can be designed, which can be marked on the screen. This helps in taking immediate decision regarding acceptability or rejection. Rheometer is used by compounder. Other details: - Development of new compound
- Rationalization of existing compound in terms of quality and economics
- To get better, optimization of curing process in the manufacturing process
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Moving Die Rheometer
We have gained immense appreciation, owing to our Moving Die Rheometer(MDR), which is used to choose right ingredients and its appropriate dose for the end products. The cure characteristics of rubber compound is analyzed by this instrument. Moreover, the physical properties and processing characteristics can also be measured. The stiffness change of rubber compound, which is compressed between two heated dies is oscillated and measured by the this Rotor less Instrument. 3 curves S’, S" and Tan Delta are generated by the MDR. A cure curve labeled S’ is produced by the MDR, which is similar to the ODR curve. Definition of S’ and S" S’ is called the elastic modulus, storage modules or in phase modulus. S" is called the viscous modulus, loss modulus or out-of-phase modulus. In the product family, instruments are in lbs, the unit of S’ and S". These are units of torque and can be in dnm, which is also a torque unit. Tan Delta From or loss of modulus divided by storage modulus or the ratio S"/S’, the Tan(Delta) is computed. When the Tan delta is smaller, the material is more viscous. Application of S" Between processability and dynamic properties of uncured compound such as die swell, a relationship may exists. After cure, the capability of a compound to meet some special application is indicated by the loss modulus. For example: In order to dampen vibration, the rubber, which finds application in an automotive engine mount should have high Tan(Delta) S". A low Tan Delta is required by the compound used in a rubber band. | application and information available | | elastic modulus s’ | viscous modulus s" | | tan delta | cure rate | | tan delta@ml | tan delta@ mh | | ts1,ts2,ts5,tc10,tc50,tc 90 | oc,end temp. Trend,reversion, | | display of s’, s" along with tan delta | cp, cpk values | | computer controlled automated testing | rotor less | | repeatability-continues repeated testing | | |
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Mooney Viscometer
Our Mooney Viscometer is suitable to measure cure rates, viscosity and scorch time. These shearing disk viscometer consists of cylindrical and flat disk, which is operated with the help of a motor to rotate continuously or slowly in one direction. Into elastomer specimen, this disk is embedded and confined in a heated die cavity. At specified temperature, the disk is maintained and kept closed by a specified force. The disk experiences a shear strain as it rotates. Offered by the elastomer, this resistance to rotates is shearing viscosity and it is proportional to mean absolute viscosity of the specimen. The elastometer attains a preheat period following which the disk began rotating. A initial high viscosity is recorded and as there is a decrease in viscosity to a minimum value, viscosity acquired with big rotor are approximately double to those of small rotor. The viscosity is reported as under - Preheat time
- Time interval to viscosity reading
- Method of sample preparation
- Mooney viscosity number
- Rotor size
- Temperature of test
Typical test results are started as under: = 50ML(I+4) 100C The details: - I = Preheat time in minutes
- 50M = Viscosity in mooney units.
- L = Large rotor (for small replace it with ‘S’)
- 4 = Time in minute after starting the motor at which the reading is taken
- 100 C = Test temperature
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Bond Peel Adhesion Test
We are engaged in providing machines for conducting Bond Peel Adhesion Test. The measurement of the bond strength or adhesives between two material is Peel or adhesion testing. Tension load is applied to the material by one of the belo mentioned process: - Two flexible material axially are pulled away from each other forming a 'T' peel
- Flexible material is pulled away from a substrate or non-flexible material, held horizontally, forming what is called a 90 degree peel
- Flexible material is pulled away from substrate or non-flexible material, both vertically held, forming what is called a 180 degree peel
When backing is separated from an adhesive bandage it would be a 'T' peel. Either a 90 degree or 180 degree peel can be attained by pulling the back of a blister pack of tablets. From the top of a yoghurt pot, when the seal is pulled, a 90 degree peel is attained. These degrees of flexibility and shapes create variation of three basic peel types, which requires various fixtures and grips. Benefits of Peel/Adhesion Testing: - Ensuring the integrity and safety of products
- Ensuring the proper functioning of adhesive seals such as openability
- Reducing cost of material and achieving lean manufacturing goals
- Compliance with industry standards
Standards: In order to test adhesives seals and bonds, various standards have been developed such as: - BS EN 1895:2001 Adhesives for Paper and Board, Packaging and Disposable Sanitary Products. 180 Degrees. 'T' Peel Test for a Flexible-to-Flexible Assembly
- ASTM D1876 - 08 Standard Test Method for Peel Resistance of Adhesives (T-Peel Test)
- ISO 11607-1:2006 Packaging for Terminally Sterilized Medical Devices - Part 1: Requirements for Materials, Sterile Barrier Systems and Packaging Systems
- ISO 11339:2003 Adhesives - T Peel Test for Flexible-to-Flexible Bonded Assemblies
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Thickness Testing
RISHIKESH manufacturing various types of thickness gauge to check the thickness of Rubber, Paper, Fabric, Card Board, Films etc. as per IS 3400 ( Part I ) 1977 in various range, throat and accuracy.
Most suitable for checking the thickness of Rubber sheet, Fabrics, Leather, Rexine, Paper, Thin Films and all other flexible materils. It provides a maximum compressive load on the specimen to get exact reading as per IS specification. Hand held thickness gauges are also available in different range and throats.
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Spark Tester
High Frequency Spark Tester consists of a Solenoid and an Interrupter which has natural High Frequency and when the current passes through the Solenoid, the hammer is attracted by its core, thereby breaking the circuit and at the same time charging the condenser. The hammer then springs back reforming the contact and allowing the condenser to discharge through an inductance of a few turns of thick wire of the Tesla Coil. This metal rod when brought within 1cm of the lining of the tank or any other vessel, produces a diffused Spray discharge, but if there is a minute crack, or microscopic hole in the lining, whether it be Glass or Rubber or PVC or any other insulation, this diffused discharge is concentrated into a bright spark passing through the hole or crack. This phenomenon is attributed to the fact that High Frequency current possess a very high tendency of taking the nearest passage to Earth. This method is therefore very useful in detecting faulty lining of vessels or tanks etc, or faulty insulation of cables, or for the detection of leaks and cracks in High Vacuum Systems, Scientific and laboratory glass apparatus
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Demattia Flex Tester
De Mattia Flex Tester, electrically operated with single phase motor provides information about the resistance of vulcanized rubber compounds, coated and treated fabrics to cracking when subject to flexing. Crack development in that part of the surface where stresses are set up during flexing, or if that part of the surface initially containing a crack, causes this crack to extend in the direction perpendicular to stress. This test also assesses the durability of material. The machine tests six specimens at a time. RISHIKESH Flexing Machines is used to test specially moulded samples for resistance to cracking or cut growth by repeated flexing. Flex testing is recommended when the flexing encountered in service is liable to simulate the action of the test. (e.g. tyre sidewalls). Cracking and cut growth increase with increasing cycles. The tester is stopped at intervals specified and the cracks evaluated. Two sets of grips on either side of the frame are reciprocated at constant frequency for a preset number of cycles controlled by a cycle counter. Samples are loaded so that they are flat when the grip are tightened and flexed but not elongated during tester operation. The range consists of 6 machines capable of handling 12, 24 or 36 samples in either an unheated cabinet or an oven with digital temperature control having a range of 60°C to 150°C. Features - Easy access cabinet or oven versions
- Cycle counter fitted with 9 - 999,999 cycles allowed/test
- Internal illumination fitted
- 60oC to 150oC temperature range on oven versions
- Motor cut outs fitted to both doors
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Ross Flex Tester
RISHIKESH Ross Flexing Machine allows one end of the test specimen to be clamped firmly to a holder arm while the pierced end is placed between two rollers that must permit a free bending movement of the test specimen during the test. During each cycle, the pierced area of the test specimen is bent freely over a 10mm ( 0.4in. ) diameter rod through a 90o angle. The machine operates at 1.7 + 0.08 Hz (100 + 5cpm ). Introduction A pierced strip test specimen is bent freely over a rod to a 90o angle and the cut length is measured at frequent intervals, to determine the cut growth rate. The cut is initiated by a special shaped piercing tool. The test gives an estimate of the ability of rubber vulcanized to resist crack growth of a pierced specimen when subjected to bend flexing. No exact correlation between these test results and service is implied due to the varied nature of service conditions. Procedure Measure and record the median thickness of the test specimen taken at three points across the width at the point of the cut. With the holder arm of the flexing machine in a horizontal position, clamp side by side the test specimens of the same making sure that the cuts are at the center point of the are of the rods. Lower the adjustable top rollers until they just touch the test specimen and lock in this position by means of the wing nuts. Permitting free travel of the test specimens between the rollers during the bending movement. Start the machine and record the number of cycles by the use of a counter. Make frequent observations, recording the number of cycles and the increase in cut length measured to the nearest 0.5mm for the purpose of determining the rate of increase in cut length. When observing cut growth, the holder arm shall be at an angle approximately 45o from the vertical. The test shall be continued until the cut length has increased 500%, that is, until the combined length of the cut and crack has increased to a total of 15.0mm ( 0.60in. ) or when 250kilocycles has been reached with slow cracking samples. In some cases the cut growth is not in a straight line as a continuation of the cut made by the piercing tool, and "star – shaped " cracking may develop. In this event, the cut growth shall be measured as the length of the longest continuous crack, regardless of its direction. When it is necessary to stop operation of the machine temporarily, the holder arm shall be in a horizontal position, so that the test specimens remain horizontal while not being flexed. Report - Sample identification,
- Specimen medium thickness,
- Test temperature if other than 23 + 2oC ( 73 + 3.6oF ), and
- The average number of cycles for each 100% increase in cut growth above the initial pierce of 2.5mm ( 0.10in. ) of the tested specimens, upto and including 500%, where possible.
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