Rubber Testing Equipments — Complete Range of Laboratory Instruments for Rubber Quality Control

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International Equipments is one of India's most experienced manufacturers, suppliers and exporters of Rubber Testing Equipments — built at our Mumbai facility since 1971 and exported to over 63 countries worldwide. Our rubber testing instruments are installed in the QC laboratories of natural rubber compounders, EPDM and synthetic rubber producers, tyre manufacturers, automotive rubber component plants, gasket and seal manufacturers, footwear plants and government testing laboratories across India and globally.

Rubber testing covers a focused set of laboratory measurements that determine the mechanical performance, durability and chemical composition of vulcanised rubber compounds. The core property tests — tensile strength, elongation, hardness, ageing resistance, ash content, carbon black content and dispersion — together tell the QC team whether the rubber compound will perform reliably across its design life in real service conditions. Our equipment range covers ALL these tests plus the sample preparation instruments (Hydraulic Press with dies, Contour Cutter) needed to produce standard-shape test specimens from rubber sheet samples.

About Our Rubber Testing Equipment Range

International Equipments is involved in the manufacturing of Rubber Testing Equipments in India since year 1971. These equipment are supplied and exported to more than 63 countries across the world. "Rubber" in a synthetic form also called as EPDM - (ethylene propylene diene monomer) has typical property of flexiblity and is highly resistant to shock absorption. Therefore rubber is used in applications where high abrasion or elasticity is a specific requirement. At International Equipments, we produce equipment to check limited physical properties such as tensile strength, elongation, hardness, Ageing test, Carbon content, Carbon dispersion, Ash content similarly we also produce few equipment for preparation of specimen required for conducting these tests such as hydraulic Press with Dies, Contour cutter with templates. Following Machines and Instruments use for Checking Rubber Strength.

What is Rubber Testing and Why It Matters

Rubber testing is the systematic laboratory measurement of vulcanised rubber's mechanical, physical and chemical properties to verify that a finished rubber compound meets the specification it was designed and procured against. Rubber differs fundamentally from plastic — it is an elastomer that returns to its original shape after deformation, can stretch to several times its original length without breaking, and absorbs shock and vibration far better than rigid materials. These unique properties make rubber irreplaceable in tyres, gaskets, seals, hoses, automotive bushings, footwear, conveyor belts and thousands of other applications where flexibility, resilience and damping are essential.

Quality control of rubber compounds is just as critical as for plastics, but the test methods are different. Tensile testing of rubber uses dumbbell specimens cut from vulcanised sheet (ASTM D 412 / ISO 37) and measures both tensile strength at break AND elongation at break — the latter often more important than the former for rubber applications. Heat ageing in a Hot Air Oven (per ASTM D 573) verifies the rubber will retain its properties through years of service. Ash content via Muffle Furnace (per ASTM D 297) and carbon black content + dispersion give compositional QC. Hardness testing (Shore A / IRHD) is the most-run rubber QC test in production lines worldwide.

Properties Tested in the Rubber Testing Laboratory

The rubber testing laboratory measures six key property groups. Each requires specific instruments — most QC labs need at least one instrument from each group:

Mechanical Properties — Tensile, Tear, Compression

Tensile strength, elongation at break, modulus at specified elongation (M100, M300) are the primary mechanical-property tests for rubber. Tear strength (ASTM D 624) is also important for tyre and automotive applications. Compression set tests (ASTM D 395) determine how well rubber recovers its shape after sustained compression — critical for seals and gaskets. Tested on Tensile Testing Machine or Universal Testing Machine using ASTM D 412 Type C dumbbell specimens.

Thermal / Ageing Properties — Heat Ageing and Retention

Rubber must retain its mechanical properties after years of service. Heat ageing tests (ASTM D 573 / ISO 188) condition rubber specimens in a Hot Air Oven at elevated temperature (typically 70°C, 100°C, 150°C) for specified durations (typically 70 hours to 7 days) — then re-test tensile properties and compare to unaged values. The percentage change in tensile strength, elongation and hardness is the indicator of long-term performance.

Hardness (Shore A / IRHD)

Rubber hardness is the most-run QC test on rubber production lines worldwide — measured with a portable Shore A durometer or laboratory IRHD hardness tester. Hardness directly correlates with the compound formulation and the cure state, making it the fastest QC check that the rubber has been compounded and vulcanised correctly. Most rubber products are specified within a tight hardness range (e.g., 60-65 Shore A for automotive seals, 70-75 for tyre tread).

Chemical Composition — Ash and Carbon Black Content

Ash content (ASTM D 297 / D 5630) measured on the Muffle Furnace tells you the mineral filler loading of the rubber compound. Carbon black content (ASTM D 1603 / D 297) measured on the Carbon Black Content Apparatus tells you the carbon black loading — typically 25-40% in tyre compounds, lower in non-tyre applications. Both are essential QC checks on incoming compound and on finished rubber products.

Carbon Black Dispersion

Even with the correct carbon black percentage, the dispersion quality (how uniformly the carbon black is distributed) significantly affects rubber properties. Tested on the Carbon Black Dispersion Tester per ISO 11345 / ASTM D 7723 — particularly important for tyre applications where dispersion drives wear resistance and rolling resistance.

Density

Rubber density (ASTM D 297 / ISO 2781) is measured on the Digital Density Apparatus by water immersion (Archimedes' principle). Routine QC check — density variation indicates compound or cure inconsistency. Typical rubber densities range from 0.95 g/cm³ (lightly-filled compounds) to 1.5 g/cm³ (heavily-filled tyre compounds).

Complete Range of Rubber Testing Equipments

1. Tensile Testing Machine (Single Screw)

Economical single-screw tensile tester — the foundation rubber QC instrument. Higher-elongation capability than typical plastic-only testers, which is essential for rubber where elongation at break can exceed 500-700%.

What it tests: Tensile strength and elongation at break of rubber dumbbells per ASTM D 412 Type C and ISO 37.

2. Universal Testing Machine (UTM)

Twin-column UTM with PC software — handles tensile + compression set + tear strength on a single machine. Best choice for labs running multiple rubber test methods. Variable cross-head speeds (10 to 1000 mm/min) accommodate all rubber test standards.

What it tests: Tensile, compression and tear testing of rubber per ASTM D 412, D 395, D 624 and ISO 37, 815, 34-1.

3. Hot Air Oven

Precision hot air oven (ambient to 250°C) — critical for heat ageing studies that determine long-term rubber durability. Used alongside the tensile tester for the standard 'unaged vs aged' tensile-property comparison.

What it tests: Heat ageing of rubber specimens per ASTM D 573 and ISO 188 (typically 70°C, 100°C, 150°C for 70 hours to 7 days).

4. Muffle Furnace

High-temperature furnace (ambient to 1150°C) — burns away the rubber matrix, leaving only the inorganic filler residue. Foundation for filler loading verification and compound composition QC.

What it tests: Ash content of rubber compounds per ASTM D 297 and ASTM D 5630.

5. Carbon Black Content Apparatus

Dedicated pyrolysis furnace + complete glassware set — critical for tyre and automotive rubber QC where carbon black loading (typically 25-40%) drives wear, hardness and electrical properties.

What it tests: Carbon black percentage of rubber compounds by pyrolysis per ASTM D 1603 and D 297.

6. Carbon Black Dispersion Tester

Integrated hot plate + dual-magnification microscope — grades the uniformity of carbon black distribution in rubber compounds. Especially critical for tyre tread compounds where dispersion drives wear and rolling resistance.

What it tests: Carbon black dispersion quality in rubber per ISO 11345 and ASTM D 7723 grading scale.

7. Hydraulic Press (Sample Cutting Press) + Dies

5-tonne bench-top sample cutting press — the foundation instrument for any rubber QC lab. Cuts standard ASTM D 412 Type C dumbbells, tear test specimens and compression set buttons. Dies supplied separately and matched to your test standards.

What it tests: Cuts ASTM D 412 Type C dumbbell specimens and other standard-shape rubber test samples up to 4 mm thick.

8. Contour Cutter with Templates

Companion to the Hydraulic Press — handles thin rubber sheet and custom specimen shapes. Useful for tear test specimens (angle, crescent) and any custom geometry not covered by standard dies.

What it tests: Powered cutting tool for thin rubber sheet and complex specimen shapes that the Hydraulic Press cannot easily handle.

9. Digital Density Apparatus

Digital balance with built-in density-determination kit — gives direct density readout. Routine QC check that catches compound mixing and cure inconsistencies before product release.

What it tests: Density of rubber samples per ASTM D 297 and ISO 2781 (water immersion / Archimedes method).

10. Universal Testing Machine for Adhesives, Ceramic Tiles & Mosaics

Specialised UTM configuration for adhesion testing — handles rubber-to-metal bonded gaskets, rubber-to-fabric belts, rubber-coated component adhesion testing.

What it tests: Bond strength of rubber-to-substrate adhesion (rubber bonded to metal, fabric, plastic).

11. Digital Peel Tester

Dedicated peel and bond strength tester — economical alternative to a full UTM for routine peel work on rubber laminates and conveyor-belt-style structures.

What it tests: Peel adhesion of rubber-bonded laminates and rubber-coated fabric structures.

Sample Preparation — The Foundation of Reliable Rubber Testing

Reliable rubber test results start with correctly-prepared test specimens. Two instruments form the rubber sample preparation chain — both essential for any well-equipped rubber QC laboratory:

Hydraulic Press + Standard ASTM D 412 Type C Dumbbell Die

The bench-top 5-tonne Hydraulic Press fitted with a standard ASTM D 412 Type C dumbbell die produces clean, dimensionally accurate tensile specimens from vulcanised rubber sheet in a single press stroke. Type C is the dumbbell geometry specified by ASTM D 412 (the central rubber tensile standard) — gauge length 25 mm, width 6.0 mm. Many labs also need tear test dies (Type A, B, C per ASTM D 624) and compression set button dies — we supply all of these separately.

Contour Cutter with Templates for Complex Shapes

The Contour Cutter is the companion tool for specimen shapes that cannot be efficiently cut with a single press die — angle tear specimens (ASTM D 624 Type A), crescent tear specimens, custom geometries and very thin rubber films. The Contour Cutter follows a template outline with a powered cutting wheel, producing clean edges on materials too thin or too tough for full-thickness die punching.

Rubber Testing Standards Followed (ASTM, ISO, BIS, IS)

• ASTM D 412 — Standard Test Methods for Vulcanised Rubber and Thermoplastic Elastomers — Tension (Type C dumbbell)

• ASTM D 624 — Standard Test Method for Tear Strength of Conventional Vulcanised Rubber and Thermoplastic Elastomers

• ASTM D 573 — Standard Test Method for Rubber — Deterioration in an Air Oven (heat ageing)

• ASTM D 395 — Standard Test Methods for Rubber Property — Compression Set

• ASTM D 297 — Standard Test Methods for Rubber Products — Chemical Analysis (ash, carbon black)

• ASTM D 1603 — Standard Test Method for Carbon Black Content in Olefin and Rubber Compounds

• ASTM D 5630 — Standard Test Method for Ash Content in Plastics and Rubber

• ASTM D 7723 — Carbon Black Dispersion in Rubber by Microscope (companion to ISO 11345)

• ASTM D 2240 — Standard Test Method for Rubber Property — Durometer Hardness (Shore A)

• ASTM D 1415 — Standard Test Method for Rubber Property — International Hardness (IRHD)

• ISO 37 — Rubber, Vulcanised or Thermoplastic — Determination of Tensile Stress-Strain Properties

• ISO 34-1 — Rubber, Vulcanised or Thermoplastic — Determination of Tear Strength

• ISO 188 — Rubber, Vulcanised or Thermoplastic — Accelerated Ageing and Heat Resistance Tests

• ISO 815 — Rubber, Vulcanised or Thermoplastic — Determination of Compression Set

• ISO 2781 — Rubber, Vulcanised or Thermoplastic — Determination of Density

• ISO 11345 — Rubber — Assessment of Carbon Black and Carbon Black/Silica Dispersion

• ISO 247 — Rubber: Determination of Ash

• ISO 7619 — Rubber, Vulcanised or Thermoplastic — Determination of Indentation Hardness (Shore)

• IS 3400 — Indian Standard methods of test for rubber and rubber-like materials

• IS 7916 — Indian Standard for vulcanised rubber gaskets

Which Tests Are Critical for Each Rubber Product?

Different rubber products require different combinations of tests. The matrix below shows which tests are typically applied to each product category:

Tyres & Tyre Components (Tread, Sidewall, Inner Liner)

Tensile (D 412), Tear (D 624), Carbon Black Content + Dispersion (D 1603 / D 7723), Hardness (D 2240), Heat Ageing (D 573), Density (D 297)

Automotive Rubber Components (Gaskets, Seals, Hoses, Bushings)

Tensile (D 412), Compression Set (D 395), Hardness (D 2240), Heat Ageing (D 573), Density (D 297), Bond Strength (D 429 with Adhesive UTM)

EPDM Roofing & Weatherstrip

Tensile (D 412), Tear (D 624), Heat Ageing, UV Ageing, Hardness (D 2240), Compression Set

Industrial Rubber Hoses & Belts

Tensile (D 412), Tear (D 624), Peel Adhesion of Bonded Plies (with Peel Tester), Density, Heat Ageing

Conveyor Belts (Rubber + Fabric Composite)

Tensile (D 412), Tear, Peel Adhesion of Plies (Peel Tester), Heat Ageing, Bond Strength (UTM for Adhesives)

Footwear & Footwear Components (Soles, Insoles)

Tensile (D 412), Tear, Hardness (D 2240), Abrasion, Heat Ageing, Density

Natural Rubber & Synthetic Rubber Compounds (Raw)

Ash Content (Muffle Furnace), Carbon Black Content + Dispersion, Density, Tensile of test sheet, Cure cycle verification

Rubber-Bonded Metal Components (Engine Mounts, Bushes)

Bond Strength (UTM for Adhesives, ASTM D 429), Tensile (D 412), Compression Set, Hardness, Heat Ageing

Latex / NBR / Nitrile / Silicone Specialty Compounds

Tensile (D 412), Hardness, Density, Heat Ageing, plus chemical-resistance soak tests (oils, fuels, chemicals)

Industries We Serve

• Tyre Manufacturers (passenger car, truck, OTR, two-wheeler)

• Automotive Rubber Component Manufacturers (gaskets, seals, hoses, bushings, weatherstrips, engine mounts)

• EPDM Roofing & Weatherproofing Manufacturers

• Industrial Rubber Hose & Belt Manufacturers

• Conveyor Belt Manufacturers (mining, port, manufacturing)

• Footwear & Footwear Component Manufacturers

• Rubber Compounders & Master-batch Producers

• Natural Rubber & Latex Producers

• Synthetic Rubber Producers (SBR, BR, EPDM, NBR, Silicone)

• Rubber-Bonded Metal Component Manufacturers

• Cable & Wire Insulation Manufacturers (rubber-insulated cables)

• Sports Goods, Toys & Speciality Rubber Product Manufacturers

• Government Testing Labs, NABL Accredited Labs & BIS-Approved Test Houses

• R&D Centres of Rubber & Tyre Companies

• Polytechnic Colleges & Rubber Technology Institutes

Why Choose International Equipments?

Manufacturing Rubber Testing Equipment Since 1971

Over 50 years of focused experience in rubber testing instrumentation — our equipment is built on decades of feedback from rubber, tyre and automotive customers across India and 63 export countries.

Exported to 63+ Countries

Our rubber testing instruments are installed in customer laboratories across the Middle East, Africa, South-East Asia, Europe, South America and beyond — proven international reliability.

Complete Rubber QC Range Under One Roof

Tensile + UTM + Hot Air Oven + Muffle Furnace + Carbon Black Content & Dispersion + Hydraulic Press + Contour Cutter + Density Apparatus — all designed and built at our Mumbai facility. One supplier for the complete rubber QC laboratory.

Used by Leading Indian and Multinational Rubber Manufacturers

Our instruments are installed in QC laboratories of major Indian tyre manufacturers, automotive rubber component plants, EPDM roofing producers, conveyor belt makers and government testing labs — including BIS-approved test houses.

Full Coverage of ASTM, ISO, BIS / IS Standards

Every instrument complies with the relevant ASTM (USA), ISO (international) and IS (India) rubber test standards — covers domestic, USA-export and European-export rubber compound specifications from a single supplier.

Complete Laboratory Package Pricing

Buy your entire rubber QC laboratory from us — package quotations cover the instrument suite needed for your specific rubber product type, with single commissioning visit, single training programme.

Custom Configurations Available

UTM load ranges, Hot Air Oven sizes, Muffle Furnace chamber dimensions, custom dies for non-standard specimen geometries — all configurable to match the customer's specific rubber product range.

ISO Certified, CE Marked Manufacturing

Designed and built at our Mumbai facility under ISO certified quality systems, with CE marking for export to the Middle East, Africa, South-East Asia, Europe and South America.

Calibration Support

We offer one calibration visit per year, which is sufficient to maintain the accuracy and performance of the equipment. The calibration visit is provided after completion of the initial 1-year warranty period.