Quick answer. Settle the hardness scale your specification names before comparing the eight hardness instruments. Shore A suits soft and medium elastomers, Shore D hard rubber, and IRHD is used where specifications call for it, and readings do not convert reliably between them. Then decide stand and dwell: a stand applies a defined force square to the surface, and a timed reading controls the creep that makes rubber hardness fall second by second. For seals and gaskets, though, compression set, recovery and tension set predict service life far better than hardness, and they depend on the multi-cell ageing oven RTE-0025.
Twenty-five instruments, coded RTE-0001 to RTE-0025, for a rubber and elastomer laboratory. Eight of them measure hardness, which tells you something about how rubber is specified. The rest cover compression - compression set, compressibility and recovery and three compression testing machines; permanent deformation in tension; density by specific gravity; DIN abrasion; flexing and fatigue with De-Mattia and Ross flex testers; impact resilience; split tear; rub proofness; gas permeability; a specimen cutting press; and a multi-cell ageing oven.
Eight hardness instruments is not redundancy. Rubber hardness is measured on several scales with several instrument types, the scales are not interchangeable, and a specification names one of them. The section below is the part of this page worth reading before you compare prices, because getting it wrong produces numbers that look perfectly reasonable and that your customer cannot use.
Three things make a rubber hardness reading reproducible. Miss any one and two laboratories testing the same compound will disagree.
| What to settle | Why | |
|---|---|---|
| Scale | Shore A, Shore D or IRHD - whichever your specification names | Shore A suits soft and medium elastomers, Shore D hard rubber and rigid plastics, and IRHD is used where specifications call for it and in a micro form for thin or small specimens. Conversion between the scales is approximate at best; a number on the wrong scale is not convertible into a compliant result |
| Stand | Hand-held or stand-mounted with a defined mass | A hand-held durometer is pressed by a person, so the applied force and the squareness of contact vary with the operator. A stand applies a defined force perpendicular to the surface, and that is what turns a reading into a measurement. If results go on a certificate, buy the stand |
| Dwell | The time between contact and reading, as the standard specifies it | Rubber creeps under the indenter, so the indicated hardness falls as the seconds pass. Standards specify a dwell - one second, three seconds, fifteen seconds depending on the method - and a hardness value quoted without its dwell time is incomplete. This is what the dual-needle and timed digital instruments exist to control |
Two further points that decide whether a hardness number is valid at all. Specimen thickness: the methods specify a minimum, and a specimen thinner than the minimum reads harder because the indenter feels the bench through it; stacking thin pieces is permitted only where the method says so, and on moulded products it usually is not. Position: readings must be taken a stated distance from any edge and from each other, and the median of several readings is reported rather than one. Ask us which standard each of the eight instruments implements, whether a stand and a timer are included, and what reference rubber blocks are supplied for checking - a durometer is checked against reference blocks, and a laboratory without them has no way of knowing its instrument has drifted.
For anyone making gaskets, O-rings, bushes or mountings, the instruments that matter most are not the hardness ones. They are compression set, compressibility and recovery, and tension set, and they all measure the same underlying thing: how much deformation is permanent after the rubber has been held deformed, hot, for a long time.
That is the property behind almost every leak in service. A compound that recovers fully at twenty-five degrees may take a permanent set at a hundred, and a seal that has taken a set no longer presses on the flange. Ask about: the jigs and spacers, and whether the compression is to a fixed deflection or a fixed load, because the two methods are different and give different numbers; the parallelism and flatness of the platens, since a non-parallel jig loads the specimen unevenly; the temperature and time the method specifies and how you will hold them, which usually means the ageing oven; and the recovery period and temperature before measurement, which is part of the method and not a convenience.
The multi-cell ageing oven, RTE-0025, is worth more attention than its position at the end of the listing suggests. It is not an ordinary laboratory oven, and the reason is specific: antidegradants, plasticisers and other volatiles migrate out of one compound and into another when samples share an air space, which changes the ageing behaviour of both. The standards therefore require that different compounds are aged in separate cells with their own air flow. A single-chamber oven full of mixed compounds produces ageing results that are a property of the batch of samples rather than of any one compound. Ask how many cells there are, whether each has its own air change and at what rate, the temperature range and uniformity, and how temperature is recorded, because an ageing test unrecorded for seventy-two hours is an act of faith.
The DIN abrasion tester reports volume loss when a specimen is run against an abrasive sheet under load. The subtlety is the sheet: abrasive sheets vary from batch to batch, so the method requires the sheet to be checked against a reference compound and the result expressed relative to it. Ask what reference rubber is supplied, where it is obtained, and what sheets cost - as everywhere in materials testing, the consumable is the running cost and in this case it is also the calibration.
The De-Mattia and Ross flex testers find cracking under repeated bending, which is how rubber fails in service far more often than by breaking. Ask the number of specimens per run, the stroke and frequency, whether a cold chamber is available, and how cracks are assessed and graded. Note that a De-Mattia tester also appears in the fabric testing equipment listing, spelled slightly differently; they are the same kind of instrument applied to different materials, so quote by code and full name.
The split tear tester and the specimen cutting press belong together, because tear results are more sensitive to specimen preparation than any other rubber test. A die that is blunt, or a cut edge with a small nick in it, starts a tear early and scatters the results - and the scatter looks like material variation rather than preparation. Budget for dies, for resharpening and for the discipline of replacing them. Ask which dies each test needs, whether the press takes them all, and what resharpening costs locally. Tensile and tear strength themselves are measured on a machine from the tensile testing machines or universal testing machines range, and for rubber you want a low-capacity load cell and grips that do not cut the specimen.
Two specific gravity instruments are listed, and density is the most undervalued routine test in a rubber laboratory. It is quick, it needs no consumables beyond water, and a change in density between batches is the earliest warning that the filler loading has changed - which usually means the compound has changed without anyone saying so. For a goods-inwards check on bought-in compound it is the first test to run. Ask about the balance resolution, the hydrostatic arrangement and whether temperature correction is applied.
Gas permeability matters if your products hold gas - bladders, diaphragms, inflatable seals, pneumatic components. Ask which gas the test uses, what pressure difference is applied, the specimen area and thickness required, how long a determination takes and what gas supply is needed at the position. Ask also what the instrument reports, since permeability, transmission rate and diffusion coefficient are related but not the same quantity, and a specification names one.
The names in this listing overlap more than they should. Eight records are hardness testers, including one whose name ends in a digit because it duplicates another; three are compression testing machines; and two are specific gravity instruments - and the listing does not say what separates them. One record spells a standards body as an ordinary word rather than an acronym. So: ask for the specification sheets of the records you are choosing between, side by side, and compare on scale, stand, dwell control and whether reference blocks are included. And as always on this part of the catalogue, quote the code and the full product name together and have both confirmed on the proforma invoice. If a name looks like a duplicate, ask; it is more likely to be our catalogue data than a second product.
For each hardness instrument: scale, standard implemented, whether a test stand and timer are included, dwell control, reference blocks supplied, and calibration certificate. For the set and recovery tests: jigs, spacers, fixed-deflection or fixed-load method, platen flatness, and the oven they depend on. For the ageing oven: number of cells, air change per cell, temperature range, uniformity and recording. For abrasion: reference compound supplied, sheet source and cost. For the flex testers: specimens per run, stroke, frequency, cold capability and assessment method. For cutting: dies included, resharpening arrangement. For all: calibration and traceability, bench space and mass, services at the position, nominal voltage, frequency and plug pattern, consumables and spares with prices and lead times, and the warranty and local service position. For any certification stated here, contact us for the latest copies of the relevant certificates before you rely on it in a tender or an accreditation file.
Related ranges: foam testing equipment for cellular materials, plastic testing equipment for thermoplastics and films, footwear testing equipment for soling and shoe components, and coated fabric testing equipment for rubber-proofed cloth. The full set is listed under raw products testing. For a quotation, tell us the destination country, the standards your customers name, which hardness scale your specifications use and what you make - a gasket plant, a tyre retreader and a footwear soling unit need three different subsets of this page.
The one your specification names. Shore A suits soft and medium elastomers, Shore D hard rubber and rigid plastics, and IRHD is used where specifications call for it, including a micro form for thin or small specimens. Conversion between scales is approximate at best, so a number on the wrong scale cannot be turned into a compliant result. Then choose hand-held or stand-mounted: a hand-held durometer varies with the operator's force and squareness, while a stand applies a defined force perpendicular to the surface. If results are reported to customers, buy the stand, and ask what reference rubber blocks come for checking drift.
Usually dwell, thickness or position. Rubber creeps under the indenter, so the indicated hardness falls as seconds pass; methods specify a dwell of one, three or fifteen seconds, and a value quoted without its dwell is incomplete, which is what dual-needle and timed digital instruments control. A specimen thinner than the method's minimum reads harder because the indenter feels the bench through it, and stacking thin pieces is allowed only where the method says so, rarely on moulded products. Readings must also be a stated distance from edges and from each other, with the median of several reported rather than a single reading.
Compression set, compressibility and recovery, and tension set. They all measure how much deformation stays permanent after rubber has been held deformed, hot, for a long time, which is the property behind almost every leak in service. A compound that recovers fully at 25 deg C may take a permanent set at 100 deg C, and a seal that has taken a set no longer presses on the flange. Ask about the jigs and spacers, whether compression is to a fixed deflection or a fixed load, since the two give different numbers, the flatness and parallelism of the platens, and the recovery period before measurement.
Because compounds contaminate each other. Antidegradants, plasticisers and other volatiles migrate out of one compound and into another when samples share an air space, changing the ageing behaviour of both. The methods therefore require different compounds to be aged in separate cells with their own air flow, and a single-chamber oven full of mixed compounds produces results that belong to the batch of samples rather than to any one compound. Ask how many cells there are, whether each has its own air change and at what rate, the temperature range and uniformity, and how temperature is recorded across a long test.
Consumables and specimen preparation. The abrasion tester reports volume loss against an abrasive sheet, and sheets vary from batch to batch, so results are expressed relative to a reference compound; ask what reference rubber is supplied and where sheets come from, since the consumable is also the calibration. For the De-Mattia and Ross flex testers, ask the specimens per run, stroke, frequency, cold capability and how cracks are graded. Tear results are the most sensitive to preparation: a blunt die or a nicked edge starts a tear early, so ask which dies the cutting press takes and how resharpening is handled.
Specific gravity is the most undervalued routine test in a rubber laboratory. It is quick, needs nothing beyond water, and a density change between batches is the earliest warning that the filler loading, and so the compound, has changed; it is the first goods-inwards check on bought-in compound. Ask the balance resolution, the hydrostatic arrangement and whether temperature correction is applied. Gas permeability matters if your products hold gas, such as bladders, diaphragms and inflatable seals. Ask which gas and pressure difference are used, the specimen size, the test time, and whether it reports permeability, transmission rate or diffusion coefficient.
Ray Export is a manufacturer and exporter of laboratory, scientific and educational equipment based at Plot No. 449, HSIIDC Industrial Area, Saha, Ambala, Haryana 133104, India. Enquiries: [email protected], +91-9817319615.
Written by Palak Mall, Senior Content Writer. Technically reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory and testing instrumentation. Last updated: 17 October 2026.
Specifications for RTE-0001 to RTE-0025, including hardness scale and dwell control, test stand and reference blocks, jig and platen details, ageing oven cells and air change, and the dies supplied, are confirmed in writing on the quotation. For calibration or traceability documents, contact us for the latest copies of the relevant certificates. No price is quoted on this page. Listing note: the eight hardness records include one whose name ends in a digit because it duplicates another; three compression testing machines and two specific gravity instruments are listed with nothing to separate them; one record spells a standards body as an ordinary word; and a De-Mattia tester also appears in the fabric testing listing under a slightly different spelling.
Particular Gravity Balance gives a basic and snappy intend to peruse specifically the particular gravity of elastic and different elastomers. Along these lines decreasing work and taking out computations. The time taken to discover particular gravity of an example is just about a large portion of a moment. The adjust comprises of an inflexible scale with particular gravity (SG) imprinted on standing vertically on a substantial base plate. To the inside point at the scale, through gem course to limit the rubbing, an adjusting arm is turned. Toward one side of the arm two tempered steel pins are hanging with yarns. One of the stick is joined with glass shake kept on the base. A monitor is given to keep away from unintentional falling of the jug amid utilize. At the other and of the adjusting arm a pointer is settled which shows the particular gravity of materials under test. A sliding weight is additionally accommodated beginning adjusting of the example of various weight a leveling of the base plate. Two models of adjust, one with scope of particular gravity between 0.9 to 3.0'' the second with scope of particular gravity/between 0.2to2.0 are accessible. An example of any shape weighing in the vicinity of 5 and 12g can be tried in the principal modular, that weighing in the vicinity of 3 and 5g can be tried in the second model, and that weighing between 1and 2g can be tried in the third made. If there should be an occurrence of second and third model, the lower stick is very overwhelming and furthermore goes about as sinker. Additionally in these models the glass shake is kept on the base of an edge, which can be slided here and there on a pole settled to the base plate to cover the full range at particular gravity.
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IRHD compose rayexport Tester made a vertical plunger. The lower side of the plunger has an indenter. The lower state of the indenter is ball sort of determined measurement. The upper sides of the plunger have a decent diverse conductive tip. The heaviness of the plunger and fitting appended to it is the minor power. A major metal weight is the real power of the predefined weight. A dial check is connected to the instrument for the estimation of the entrance profundity of the indenter to the elastic. A power worked ringer, for tenderly vibrating the device to defeat the slight contact is mounted under the front of the instrument. The analyzer is done in NC based painting and splendid chrome plating to give it a consumption opposition wrap up.
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Commotion Abrasion analyzer will be outlined will determine abrasion safety list for characteristic and engineered elastic On understanding with those over guideline. It comprises for test example holder for An barrel shaped opening movable the middle of 15. 5 with 16. 3 mm to cinch those test example with a plan on conform those period from claiming test example distending crazy. Those holder may be mounted Eventually Tom's perusing An screw component along a length of a pivoting drum for which those abrasive fabric will be settled. The development of the screw system Furthermore drum may be provided for Toward a electric motor, gearbox Furthermore chain component to provide for those specified pace about revolution of the drum and the specified parallel development of the test example holder. The swivel arm What's more test example holder would In this way arranged that the test example may be pressed against those drum under those specified load with its focus hub In an slant for 3 level of the peroxide blonde in the heading of revolution Also set over the longitudinal hub for drum. An rack Furthermore pinion course of action with turn those test example something like its hub Throughout the test (whenever desired) will be likewise Gave. Those abrasive material is solidly altered of the drum utilizing a suitableness peel capable cement with the finishes of the abrasive material butt jointed together. The supplies will be furnished for farthest point switches which, What's more of giving In venture out safety of the development for test holder Eventually Tom's perusing keeping the bring down edge of the test example holder on touch those abrasive material. The gear may be fabricated ahead unbending steel build Also done done ash metallic Also splendid chrome / zinc plating will provide for it An erosion safe complete. Shaping die, rotating kind cutting pass on (hollow drill) for get ready test examples Furthermore additional abrasive fabric are accessible Concerning illustration nonobligatory adornments.
De Mattia flex analyzer need a situated from claiming grips on hold test examples On two tiers for their holding countenances lying in the same verthandi plane. Considering you quit offering on that one end of the test example done an altered grip and the different wind Previously, An responding grip gives those flexing Furthermore unflexing movement. The set from claiming grip need two-fixed grip Also particular case extensive responding grip positioned the middle of them in place with flex A large portion of the test example same time alternate half is, no doubt unflexed. Those responding grip is slide around solidified and ground rods settled on about secondary carbon steel. Those responding movement is Gave Eventually Tom's perusing an unpredictable Also linkage system driven Eventually Tom's perusing a electric engine through V-belt What's more pulleys. An six digit electronic counter will be furnished for demonstrating those number of the test cycles undergone. The supplies may be expand on an inflexible created build plate Furthermore completed for metallic work of art and brilliant chrome/zinc plating with provide for it An erosion safe complete. Shaping dies for get ready test specimen, Furthermore dance and punch gathering for settling on beginning split clinched alongside test example to split development test would accessible as discretionary adornments.
Compressibility and recuperation analyzer of gasket material comprise of a solidified and ground surface on which the example is put. There are an arrangement of steel tube shaped shape a solidified and ground surface on which the example is put. There are an arrangement of steel tube shaped shape penetrators of determined sizes and shape as indicated by the material test. There are two dials additionally mounted on the blacksmith's iron for the estimation of the thickness of the test example at the season of preloading and the aggregate load. There are two computerized dials so that by taking the normal esteem you can quantify the precise thickness.
There is the window based programming in the heap screen for the utilization of preload and significant load for the predetermined period after that bell give the sign to take note of the dial measure perusing. Preload – A preload which might incorporate the heaviness of the penetrator itself and included weight of the penetrator itself and added weights to give the esteem determined inside ± 1%. Preloads for different sorts of gasket materials.
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We are driving Manufacturer, exporter and provider of Compression Testing Machine. We plan and build up the entirety of our machines utilizing premium-review crude material and parts that are sourced from the dependable merchants of the market. The machine is outfitted with offices for hand drawing if there should be an occurrence of energy disappointment.
Contact Ray Export for your School, College Civil and Mechanical Engineering Lab Instruments. We are the best engineering lab equipments, engineering equipment manufacturer india, engineering equipment india, chemical engineering lab equipments, control engineering laboratory equipments, control engineering laboratory equipment, control engineering lab equipment in Ambala, India.
We are a main maker of Digital Rubber Hardness Tester. We
offer an extensive variety of Digital Rubber Hardness Tester.
Highlights:
· Accuracy: ? ±1 HA/HD
· Resolution: 0.1HA/HD
· Calibration Certificate Included
· Conforms to ASTM D-2240-05,
GB/T-531.1-2008/ISO7619-1:2004
· An expansive, simple to-peruse LCD show with backdrop
illumination
· AC Adapter/Charger and Batteries Included
· Charger with US/EUR/UK Plugs selectable
· Measurable material: Natural elastic, Chloroprene (Diane)
elastic, Polyester, PVC, Leather, Nitrile elastic, Paraffin, Vinyl, Cellulose
acetic acid derivation items, Polystyrene glass Etc.
· This gadget is reasonable for the An and D Shore hardness
models, and
· Has expansive materialness.
· The quantity of critical hardness information hold work,
the LCD
· Monitor to guarantee that the administrator
misreading.
· Measurement results can be printed remotely.
· Measurement mode: Averaging mode, Max Mode,
· Maximum normal mode.
· Control resistances can be set to alert outside the
ability to control resiliences.
· Available Grubbs criteria of estimation information to do
blunder taking care of.
· The work piece Number can be set.
· Backlight lit time flexible.
· To spare power, the key sound and caution sound can be
closed down.
· Measurement information can be put away, perusing, bunch
printing.
Specifications:
|
Accuracy |
? ± 1 HA |
|
Resolution |
0.1 HA |
|
Display |
128*64 dot matrix LCD with LED Backlight |
|
Memory |
500 data |
|
Battery Indicator |
Battery icon flashes when battery is low |
|
Power |
3.6VDC 800mAH Ni-MH rechargeable batteries |
|
Life time |
Approximately 30 hours |
|
Charger / Adaptor |
Input:110~240VAC, output: 5V 1A |
|
Print |
Thermal Printer(Optional accessories) wireless printing |
|
Operating temperature |
-10 to 40°C |
|
Operating humidity |
20 to 80% |
|
Storage temperature |
-20 to +50°C |
|
Storage humidity |
5 to 95% |
|
Dimensions |
150X50.5X29mm |
|
Weight |
170g |
We are a main maker of Dial Type (Dual Needle)
Rubber Hardness Tester. We offer an extensive variety of Dial Type (Dual
Needle) Rubber Hardness Tester.
Application:
· Shore an intended to quantify the entrance
hardness of elastic, elastomers and other elastic like substances, for example,
neoprene, silicone, and vinyl. It can likewise be utilized for delicate
plastics, felt, cowhide and comparative materials.
· With test Piece
· Dual Needle takes the perusing subsequent to
expelling from the work piece
Technical Details:
|
Test scale |
shore hardness |
|
Standards |
DIN53505, ASTMD2240, ISO7619, JISK7215 |
|
Measurement Range |
0-100HA(HD) |
|
Measurement deviation |
<1%H |
|
Resolution |
1 |
|
Operating Conditions |
0oc to 40oc |
|
Weight (not including probe) |
200g |
|
Packing |
Wooden Box |
|
Calibration |
Optional
|
Contact Ray Export for your School, College Civil and
Mechanical Engineering Lab Instruments. We are the best engineering lab
equipments, engineering equipment manufacturer india, engineering equipment
india, chemical engineering lab equipments, control engineering laboratory
equipments, control engineering laboratory equipment, control engineering lab
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We are a main producer of Portable Metal
Hardness Tester. We offer an extensive variety of Portable Metal Hardness
Tester .
Application
· Shore An is intended to gauge the infiltration
hardness of elastic, elastomers and other elastic like substances, for example,
neoprene, silicone, and vinyl. It can likewise be utilized for delicate
plastics, felt, cowhide and comparative materials.
· With test Piece
· Dual Needle takes the perusing in the wake of
expelling from the work piece
Technical Details :
|
Test scale |
shore hardness |
|
Standards |
DIN53505, ASTMD2240, ISO7619, JISK7215 |
|
Measurement Range |
0-100HA(HD) |
|
Measurement deviation |
<1%H |
|
Resolution |
1 |
|
Operating Conditions |
0oc to 40oc |
|
Packing |
Wooden Box |
|
Guarantee |
6 Months |
|
Calibration |
Optional |
Contact Ray Export for your School, College Civil and
Mechanical Engineering Lab Instruments. We are the best engineering educational
equipments india, engineering equipments distributors, engineering lab
instruments, engineering equipments manufacturer, thermodynamics engineering
equipment, engineering educational lab equipments in Ambala, India.
Standard Series Hardness Tester is intended to gauge the entrance hardness of elastic, elastomers and other elastic like substances, for example, neoprene, silicone, and vinyl. It can likewise be utilized for delicate plastics, felt, cowhide and comparative materials. With test Piece
Test scale | shore hardness A |
Type | Single Needle |
Measurement Range | 0-100HA(HD) |
Measurement deviation | <1%H |
Resolution | 1 |
Operating Conditions | 0oc to 40oc |
Packing | Wooden Box |
Guarantee | 6 Months |
Calibration | Optional |
Contact Ray Export for your School, College Civil and Mechanical Engineering Lab Instruments. We are the best engineering educational equipments manufacturer, engineering educational equipments in india, physics lab engineering equipment suppliers, civil engineering lab equipments, civil engineering lab instruments, engineering equipment manufacturer in Ambala, India.
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