We at, Prolific Engineers, are manufacturers, exporters and suppliers of adhesion testers, adhesive testing equipment, automobile accessories testing equipment, building hardware testing equipment, cables & conduits testing equipment in India.

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Determination of elongation of attached organic coatings such as paints is carried out by the use of a conical mandrel apparatus. The coating is done on a substrate of mild steel sheet and rolled over a conical mandrel of specified dimensions. The substrate gets folded over the mandrel so that a known extension is produced on its outer surface.

The coating, which is adhering to the substrate, also undergoes extension. Because of this extension, the coating layer is split into two near the narrower end of the conical mandrel. The distance of the starting of this parting from the conical edge when compared with the graphs provided gives the value of the extension at the point where the parting starts, thus giving an indication of the extensibility of the coating.

The PROLIFIC Conical Mandrel Bend Tester for paints consists of a conical mandrel of specified dimensions rigidly held in two supporting brackets. The substrate with the test coating is held rigidly along one of the tapered edges of the mandrel. A roller bar, which moves at a set distance from the outer edge of the conical mandrel, folds the test panel over the mandrel.

The coating is observed with naked eye after folding and the distance of the beginning of parting from the narrow side of the mandrel is determined. This distance, when correlated with the thickness of coating, gives its extensibility.

The apparatus is finished in grey hammertone stoving painting and bright chromium / zinc plating to give it a corrosion resistant finish.

Bursting strength of any material such as fabric, leather, paper etc. is its strength under multi-directional force and is defined as the hydrostatic pressure required to produce rapture of the material when pressure is applied at a controlled increasing rate through a rubber diaphragm.

The PROLIFIC Bursting Strength Tester is designed to find bursting strength of fabric / leather / paper / paperboard. A test specimen is held between two annular clamps under sufficient pressure to minimize slippage. The upper clamping surface has a continuous spiral groove and the lower clamping surface has a number of concentric grooves. A circular diaphragm of pure gum rubber is clamped between the lower clamping plate and a pressure cylinder so that before the diaphragm is stretched by pressure underneath it the centre of its upper surface is below the plane of the clamping surface.

The equipment is fitted with a motor driven cam mechanism, which increases fluid displacement on the lower side of the diaphragm at a specified rate. The equipment is provided with an arrangement that automatically brings down the pressure and stops the motor on completion of the test cycle. A digital pressure gauge with peak memory indicates the maximum pressure attained before failure of the test specimen.

The equipment is ruggedly designed to give a long and trouble free life. The components are either chrome / zinc plated or finished in grey hammertone stoving painting to give the equipment a corrosion resistant finish.

The tearing strength of fabrics, papers, plastic films, or other similar materials in sheet form is determined by measurement of work done in tearing through a fixed length of the test specimen using the Elmendorf Tearing Tester.

The PROLIFIC Elmendorf Tearing Tester consists of a brass sector pendulum pivoted on anti friction ball bearings over a vertical bracket fixed on a rigid metallic base. The test specimen is held between two clamps, one of which is mounted on the pendulum and the other is mounted on the vertical bracket. The clamps are mounted in such a manner that their holding faces are aligned with each other when the pendulum is locked in its raised position.

The pendulum is released by lifting a release lever. This action causes the pendulum to fall down under its weight and to tear the test specimen while doing so. The energy absorbed during tearing is indicated on a scale fitted on the pendulum by a low friction pointer pivoted on the axis of the pendulum.

An adjustable knife is also mounted on the pendulum support bracket. It is centered between the two clamps and is used for making the initial slit in the test specimen.

Check weights are supplied with the tester for verification of the scale.

The apparatus is finished in grey hammertone stoving painting and bright chrome plating to give it a corrosion resistant finish.

Augmenting weights for increasing the range of the tester for testing high strength materials are available as optional accessories. Low strength test specimens may be tested by mounting multiple test specimens at the same time.

The coefficient of friction is the ratio of the frictional force and normal pressure acting on two surfaces in contact with each other. Thus coefficient of friction is an inverse measure of the relative ease with which a material will slide over a similar or different material.

The PROLIFIC Coefficient of Friction Tester for plastic films is designed to find static and dynamic coefficients of friction between two flat surfaces of flexible plastic films. It consists of a rigid and smooth horizontal glass platform and an arrangement to measure frictional force between the test specimen mounted on it and a movable sled.

The horizontal platform is fixed on the base plate and the specimen is held over its surface with the help of pressure sensitive adhesive tapes. The other portion of the specimen is held on a metal sled having its bottom face lined with rubber foam.

The sled is kept over the specimen held on the platform and is made to move over the platform at the specified speech with the help of a screw mechanism driven by a synchroset electric motor. It is also connected to a load cell for measurement of frictional force acting on it. A digital display with peak force indicating arrangement enables measurement of both the instantaneous force and maximum force exerted during the slipping operation. Micro switches are provided to automatically stop the motion at the extreme ends of the travel of the sled.

The equipment is built on a rigid fabricated steel frame and is finished in grey hammertone stoving painting and bright chrome / zinc plating to give it a corrosion resistant finish.

Oxygen index is defined as minimum concentration of oxygen, expressed as volume percent, in a mixture of oxygen and nitrogen that will just support flaming combustion of plastic materials under equilibrium condition of candle like burning. The equilibrium is established by the relation between the heat lost to the surroundings as measured by either time of burning or length of specimen burned. This point is approached from both sides of the critical oxygen concentration in order to establish the oxygen index.

The PROLIFIC Oxygen Index Apparatus consists of a test column made of borosilicate glass supported on a brass base. The mixture of nitrogen and oxygen is released from the bottom of tube, which is filled with glass beads for mixing and evenly distributing the gas mixture. A specimen holder is provided to hold the specimen vertically in the center of the test column with its lower end more than 100 mm above the top of glass beads.

The specimen holder is supported in a glass tube fixed at the center of the test column and can be taken out and inserted from the column. A thermocouple probe is also fitted in the test column above the surface of the beads to measure the temperature of the gases inside the column, which is indicated on a digital temperature indicator. A tube with suitable orifice for pilot flame is provided for igniting the specimen by inserting it from the top of the test column.

Two rotameters with needle valves are provided to control and measure oxygen and nitrogen flow in the test column. The rotameters are calibrated with an accuracy of 3% of full-scale range. A timer for indicating the time of burning with a switch to start it manually is also provided. The rotameters, temperature indicator, and timer are fitted on a sheet metal panel on top of which the test column is fixed.

Oxygen, nitrogen and propane / LPG gas cylinder are not provided with the equipment and have to be arranged by the purchaser.

The ability of rubber products to withstand repeated flexing without developing cracks is of prime importance where such products are used in conditions undergoing repeated flexing.

Flexing endurance of rubber products is determined by simulating in the laboratory the action of flexing repeatedly under standard conditions of speed, mode, and degree of flexing.

One of the accepted procedures for determination of flexing resistance makes use of a De Mattia flexing tester. This tester provides useful information about the resistance of compounds of vulcanized rubber to flex cracking when subjected to flexing. Cracks develop in that part of the surface where stresses are set up during flexing, or if that part of the surface initially contains a crack, cause this crack to extend in a direction perpendicular to the stress.

The PROLIFIC De Mattia Flex Tester consists of a set of grips to hold test specimens in two tiers with their holding faces lying in the same vertical plane. The flexing and unflexing action is provided by holding one end of the test specimens in a fixed grip and the other end in a reciprocating grip.

The set of grips has two fixed grips and one large reciprocating grip positioned between them in order to flex half of the test specimens while the other half are being unflexed. The reciprocating grip is fitted with gunmetal bushes, which slide on hardened and ground rods made of high carbon steel. The reciprocating motion is provided by an eccentric and linkage mechanism driven by an electric motor through a V-belt and pulleys.

A six digit electronic counter with reset and memory backup is provided for indicating the number of test cycles undergone.

The equipment is built on a rigid metallic base plate and finished in grey hammertone stoving painting and bright chrome / zinc plating to give it a corrosion resistant finish.

The standard model of the tester is designed to test up to six test specimens at one time. A special model capable of testing up to twelve test specimens at a time can also be offered against specific enquiries.

Moulding dies for preparing test specimen and jig and punch assembly for making initial crack in test specimens for crack growth test are available as optional accessories.

A special model of the tester, which can test up to twelve rubber specimens at elevated temperature, is also available. In this model the grips of the tester are placed inside a double walled oven having a front door fitted with toughened glass. The inner walls of the oven are made of aluminium sheet while the outer ones are of CRCA mild steel sheet. The space between the walls is filled with mineral wool for insulation. An electric heating element is provided for heating the air in the oven. An air-circulating fan for uniform temperature distribution in the oven is also provided. The temperature of the oven is controlled and indicated by a digital temperature controller cum indicator.

The Scott flex tester is used for determination of operational life of flat transmission belts. Five test specimens taken from the sample of belt under test are flexed repeatedly over cylindrical hubs under a specified tension. The average number of flexing cycles which cause the plies of all the five test specimens to separate gives a measure of its dynamic fatigue life.

The PROLIFIC Scott Flex Tester consists of a set of five test stations, each station having an arrangement to hold one test specimen of specified dimensions in a set of self-tightening roller type grips, a hub over which the test specimen can be bent through the specified angle, and an arrangement to move the test specimen in a reciprocating motion over the hub.

The hubs are pivoted on two grease-sealed ball bearings, which are in turn supported at one end of loading levers. The other end of the loading levers carry dead weights to apply the required tension on the test specimens in contact with the hubs. If desired, the position of the dead weights can be changed to alter the tension on the test specimens. The loading lever can be lifted by a foot pedal to momentarily remove the tension on the test specimens for facilitating the observation for ply separation.

The two ends of the test specimens are clamped in a set of self-tightening grips, which are given reciprocating movement with the help of rocker arms mounted on a horizontal shaft. An oscillating movement is given to the shaft through an electric motor and a worm reduction gearbox with the help of an eccentric and link mechanism.

Individual digital counters with non-volatile memory are connected to each test station to count the total number of test cycles undergone by each test specimen. The counter corresponding to a particular test specimen stops counting when the load is removed momentarily when observing for ply separation and if the sample is removed. The number of test cycles undergone by the test specimens is retained in the memory of the counters even if the power to them gets switched off temporarily.

The various components are mounted on a sturdy steel frame, which is covered from front, sides, and top with CRCA sheet. The testing area has a full-length clear acrylic hinged lockable cover to enable observation of test specimens during the test.

The equipment is finished in grey hammertone stoving painting and bright chrome or zinc plating to give it a corrosion resistant finished. The frame is painted black while the testing area is painted white for easy detection of rubber particles torn loose from the test specimens and to facilitate determination of the end point.

Hardness is one of the most important properties which determine the suitability of any rubber component for its intended end use. Incorrect hardness may defeat the basic purpose for which the component is designed. Thus accurate and reliable determination of hardness is of extreme importance in rubber field.

Amongst the various means for the determination of rubber hardness the most important ones are the Durometer and the IRHD Hardness Tester. While the first uses the principle of indentation of a truncated cone in rubber under varying loads acting through a spring, the second method uses a fixed dead load acting on a hemispherical indenting tip. Whereas the first method suffers from the disadvantage of permanent set getting developed in the spring and thus affecting its accuracy, the second method, being based on dead load principle, is free from this problem.

The PROLIFIC IRHD Hardness Tester is a table model equipment suitable for reference testing of hardness of rubber or similar polymers in the laboratory. It consists of a plunger rod carrying a hardened hemispherical tip of the specified diameter at its lower end. The rod is located within a cylindrical guide and is constrained to move inside it. The base of the guide acts as the pressure foot surrounding the point of indentation. Under normal condition the pressure foot extends below the indenting tip, thus preventing it from getting damaged. An indenting load is positioned over the plunger rod without directly acting on it.

The test specimen having flat and parallel top and bottom faces is placed on a horizontal platform located below the indenting tip. The platform can be raised up by rotating a screwed wheel. This upward movement of the platform causes the test specimen to come in contact first with the pressure foot and later with the indenting tip under the specified contact load.

Depth of penetration of the indenting tip into the test specimen is determined with the help of a dial indicator fitted at the top of the pressure foot assembly. The contact between the dial indicator and the top of the plunger rod is made through an electrical arrangement to ensure that the weight of the stem of the dial indicator does not act on the test specimen. An electric buzzer is provided to give low intensity vibrations to the plunger rod to eliminate friction. The dial indicator gives the depth of indentation in units of 0.01 mm, which can be converted into IRHD hardness values with the help of a standard table provided with the equipment.

The tester is finished in grey hammertone stoving painting and bright chrome plating to give it a corrosion resistant finish. Three models of the tester are available to cover different ranges of hardness.

The brittleness of rubber or other elastomers at low temperature may be determined with the help of a low temperature brittleness test.

In this test the test specimens are held at one of their ends in a suitable grip and a semi-cylindrical edge of a specified radius made to strike them with a known velocity. The effect of the impact is then examined visually to evaluate low temperature brittleness of the material under test.

The PROLIFIC Low Temperature Brittleness Tester for elastomers consists of a test specimen holder to mount ten test specimens at one time, a motorized pendulum carrying a striking edge which strikes the test specimens held in the holder, and a double walled cooling bath for cooling the test specimens in.

The arrangement to mount test specimens can hold up to ten test specimens at one time. The holder can be rotated to dip the test specimens in the cooling medium. At the time of impact the test specimens are held in vertical plane passing through the axis of rotation of the pendulum such that the striking edge strikes them perpendicular to their face.

The pendulum is pivoted on two ball bearings to give a low friction movement. It carries at its outside edge a flat metallic bar having a semi-cylindrical contact edge to strike the test specimens. The pivot axis of the pendulum is located above the cooling bath. The pendulum rotates at the desired speed with the help of an electric motor, worm gear, and pulley set. The speed of rotation of the pendulum is set to give the specified striking velocity to the striking edge. The motor is started with the help of a push button and stops automatically with the help of an electro-magnetic brake after one revolution of the pendulum.

The bath is of double walled construction with inside made from stainless steel sheet and outside of mild steel CRCA sheet with thermocole insulation around the outer chamber. The cooling medium is poured in the inner chamber of the bath from the top and can be removed through a valve at its bottom. Cooling is carried out by adding powdered dry ice to either the cooling medium or in the gap between the two chambers. An electric immersion heater is provided to raise the temperature of the bath. The temperature is indicated and controlled with the help of a digital temperature indicator cum controller. A motorizes stirrer is provided to stir the cooling medium to ensure a uniform temperature in the bath.

The bath and the pendulum are placed inside a sheet metal enclosure having an acrylic viewing door. The supply to the motor is cut off if the door of the enclosure is open.

The equipment is finished in grey hammertone stoving painting and bright chrome / zinc plating to give it a corrosion resistant finish.