Why is the pendulum release angle always 150 degree?

ASTM D 256 and ISO 180 specify that the pendulum must be released from a fixed angle so the striking energy is consistent across every test and every laboratory worldwide. 150 degrees from the vertical is the standard release angle defined by these specifications — it gives the pendulum exactly the right potential energy at release. All our impact testers comply with this requirement.

Izod Charpy Impact Tester Manufacturer India | Computerised & Analogue Model

Name: Izod / Charpy Impact Tester — Computerised & Analogue Models
Brand: International Equipments
SKU: CHARPY-IZOD-IMPACT
Availability: InStock

About Izod / Charpy Impact Tester — Computerised & Analogue Models Manufacturer in India

As per ASTM D - 256 & ASTM D 6110 as well as ISO 179 and ISO 180 to test impact resistance of plastics by Izod and Charpy method respectively. The test indicates the energy required to break specimen by axial impact

International Equipments is a leading manufacturer, supplier and exporter of Izod and Charpy Impact Testers in India. From our Mumbai facility we build pendulum-type impact testers in both Computerised and Analogue variants, fully compliant with ASTM D 256, ASTM D 6110, ISO 179 and ISO 180. Our impact testers are used by plastic, polymer, composite, FRP, automotive and material-testing laboratories worldwide to determine the energy absorbed by a standard notched specimen when struck by a calibrated pendulum.

Both Izod and Charpy tests are critical quality-control measurements for any rigid plastic, composite or polymer-based product where toughness, brittleness and impact resistance affect end-use performance — from plastic pipes and crates to automotive components and engineering plastic parts. A reliable impact tester gives the manufacturer the data needed to choose the right grade, validate batch consistency and prove compliance with national and international standards.

What is an Izod / Charpy Impact Tester?

An Izod / Charpy Impact Tester — sometimes called a Pendulum Impact Tester or simply Impact Strength Tester — measures the energy a plastic, polymer or composite specimen absorbs when broken by a single sudden blow. A calibrated pendulum is raised to a fixed release angle, then allowed to swing down and strike the test specimen. The energy lost by the pendulum (measured by how high it swings up after breaking the specimen) is the impact energy of the material, reported in Joules or kg-cm.
Impact testing is one of the most important mechanical tests in the plastic industry because brittle failure under sudden load can happen even when a material has good tensile strength. The notch in the specimen concentrates stress at a known point, ensuring repeatable and comparable results across batches, suppliers and test laboratories. The same instrument can run both the Izod test and the Charpy test by changing the specimen mounting position.

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Computerised Izod Charpy Impact Tester Manufacturer India — International Equipments

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Analogue Izod / Charpy Impact Tester

as per ASTM D - 256 & ASTM D - 6110 to test impact resistance of plastics. The test indicates the energy required to break standard test specimen.

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Computerised vs Analogue — Which Model Should You Choose?

Computerised Model — Recommended When You Need

Digital test reports for ISO 9001 / NABL audit; the higher 50 J capacity for tougher plastics and composites; storage and merging of multiple test results with statistical analysis; the Impact Energy vs Angular Displacement graph for documentation; automatic conversion between Joules/m, kg-cm/cm and ft-lb/inch; or a printable hard copy of every test.

Analogue Model — Recommended When You Need

A reliable, low-maintenance impact tester at an economical price; basic Izod/Charpy testing where results are read manually and recorded on a paper register; a tester for small QC labs, polytechnic colleges, ITI institutions and educational testing labs; or a backup unit alongside your existing computerised tester.

Computerised Izod / Charpy Impact Tester — Specifications

Test Method	Both Izod and Charpy methods supported
Capacity	Up to 25.00 Joules
Release Angle of Pendulum	150°
Range of Scales (Four Scales)	0–2.71 J, 0–5.42 J, 0–10.84 J, 0–21.68 J, 0–25.00 J and 0–50 J
Minimum Resolution on Scale	0.02 J, 0.05 J, 0.1 J, 0.2 J, 0.2 J and 0.5 J respectively
Direct Display on Microcontroller	Impact strength in Joules/meter, kg-cm/cm, kg-mtr/mtr, J/mm², J/cm² and kJ/m²
Graphic Display through PC	Impact Energy vs. Angular Displacement graph
PC Reports	Numeric reports with values as per ASTM, ISO and IS standards in different units; printable via attached printer
Paint Finish	Powder Coated
Power Supply	230 Volts, 50 Hz, Single Phase

Izod Method vs Charpy Method — What's the Difference?

Izod Impact Test

The specimen is clamped vertically as a cantilever, with the notch facing the pendulum. The pendulum strikes the free upper end of the specimen. Standards: ASTM D 256 and ISO 180. Most widely used impact test for plastics in India and the USA — required by the majority of plastic-grade specifications including HDPE, PP, ABS, PC, Nylon and acrylic materials.

Charpy Impact Test

The specimen is supported horizontally on both ends as a simply-supported beam, with the notch on the opposite side to the pendulum strike. The pendulum strikes the centre of the specimen. Standards: ASTM D 6110 and ISO 179. Common in European specifications and for composites, FRP, brittle thermosets and engineering plastics. Charpy gives a different absolute value than Izod even on the same material — both are reported in the same units.

One Machine, Both Tests

Our Izod / Charpy Impact Tester runs both methods on the same instrument. The operator simply changes the specimen-mounting fixture from cantilever (Izod) to simply-supported (Charpy) and selects the appropriate pendulum. This means a single capital purchase covers every Izod and Charpy specification in your standards list.

Our Two Models — Computerised & Analogue

We offer the Izod / Charpy Impact Tester in two variants to match every laboratory budget and accuracy requirement:
The Computerised Model is our flagship instrument — a microcontroller-based, PC-interfaced impact tester with up to 50 Joules capacity, four interchangeable measurement scales, automatic result calculation, graph plotting and printable test reports.
The Analogue Model is a manual, pendulum-and-pointer impact tester with up to 21.68 Joules capacity. Results are read directly from the calibrated mechanical scale. It is the most economical choice for small QC labs, educational institutions and laboratories where digital reporting is not mandatory. Both models comply with the same international standards (ASTM D 256, ASTM D 6110, ISO 179, ISO 180) and use the same robust mechanical pendulum design. The choice between the two is essentially digital reporting and software vs analogue scale reading.

Analogue Izod / Charpy Impact Tester — Specifications

As per ASTM D - 256 & ASTM D - 6110 to test impact resistance of plastics. The test indicates the energy required to break standard test specimen.

Parameter	Specification
Test Method	Both Izod and Charpy methods supported
Capacity	Up to 21.68 Joules
Release Angle of Pendulum	150°
Range of Scales (Four Scales)	0–2.71 J, 0–5.42 J, 0–10.84 J and 0–21.68 J
Minimum Resolution on Scale	0.02 J, 0.05 J, 0.1 J and 0.2 J respectively
Display	Analogue (mechanical pointer & scale)
Paint Finish	Powder Coated

Required Accessories — Notch Cutter & Micro-meter Jig

Reliable Izod and Charpy impact testing requires the specimen to have a precisely cut notch of standard dimensions (typically 2.54 mm wide × 0.25 mm tip radius). A poorly cut notch is the single biggest cause of inconsistent impact results between labs.
International Equipments manufactures the two essential accessories you need alongside the Impact Tester:

Motorized Notch Cutter
Machines a precise, ASTM/ISO-compliant V-notch in plastic specimens automatically — ensuring notch radius, depth and angle are repeatable across every sample.
Micro-meter Jig for Notch Measurement
Specialised micrometer jig for verifying the notch depth and the residual specimen thickness under the notch — required by ASTM D 256 to confirm specimen compliance before testing.

Technical Information

ASTM D 256 — Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
ASTM D 6110 — Standard Test Method for Determining the Charpy Impact Resistance of Notched Specimens of Plastics
ISO 180 — Plastics: Determination of Izod Impact Strength
ISO 179 — Plastics: Determination of Charpy Impact Properties
IS 13360 (Part 5/Sec 7) — Indian Standard for Charpy Impact Testing of Moulded Plastics
IS 13208 — Indian Standard for Izod Impact Testing of Plastics

Impact strength testing of HDPE, LDPE, PP, PVC, ABS, PS, PC, Nylon (PA), Acrylic and other engineering plastics
Notched-bar Izod impact testing per ASTM D 256 (most common QC test in Indian plastic industry)
Charpy impact testing per ASTM D 6110 / ISO 179 for European-spec materials and composites
Incoming raw-material QC of polymer granules and master-batches
Brittleness and toughness evaluation of injection-moulded and extruded products
Composite & FRP plate impact resistance testing
Automotive plastic component impact validation
R&D testing of new polymer grades and blends
Testing of recycled plastic to confirm minimum acceptable impact strength
Educational and demonstration testing in polymer engineering courses

Plastic Pipe Manufacturers (HDPE, PPR, PVC, PEX)
Plastic Crate, Bottle, Bin & Moulded Product Manufacturers
Automotive Component Plastic Suppliers
Engineering Plastic Producers (ABS, PC, Nylon, POM, PMMA)
Composite & FRP Fabricators
Polymer Master-batch & Compounding Units
Recycled Plastic Processors
Petrochemical & Resin Producers
Government Testing Labs, NABL Labs & Universities
Polytechnic Colleges & ITI Institutes (Analogue Model)

Both Izod and Charpy on One Machine
A single instrument runs both pendulum impact methods, covering every common plastic test specification used in India and abroad as per ASTM & ISO.
Two Models, Same Standard Compliance
Choose the Computerised model for digital reporting or the Analogue model for economy — both meet ASTM D 256, ASTM D 6110, ISO 179 and ISO 180.
Up to 50 Joules Capacity (Computerised)
The Computerised model's 50 J capacity exceeds the 21.68 J of typical Izod testers — useful for tougher engineering plastics and composites.
Four to Five Interchangeable Scales
Lower scales (down to 0.02 J resolution) give accurate readings for soft or low-impact specimens; higher scales handle tough materials. One machine fits every sample type.
ASTM, ISO & IS Reports
The Computerised model generates results in Joules/m, kg-cm/cm and other units — printed in ASTM, ISO or IS report format depending on the standard you follow.
Notch Cutter & Micro-meter Jig from One Supplier
We manufacture the complete impact testing package — Tester + Notch Cutter + Micro-meter Jig — under one roof, ensuring perfect specimen preparation.
ISO & CE Certified
Designed and built at our Mumbai facility under ISO certified quality systems, with CE marking for export to Europe and the Middle East.

Frequently Asked Questions

What is the difference between the Izod test and the Charpy test?

The Izod test holds the specimen vertically as a cantilever — clamped at the bottom and free at the top — with the notched face pointing towards the pendulum. The Charpy test supports the specimen horizontally on two anvils as a simply-supported beam, with the notch on the back face away from the pendulum strike. Izod (ASTM D 256, ISO 180) is most common in India and the USA, while Charpy (ASTM D 6110, ISO 179) is widely used in Europe and for composite materials. Our impact tester performs both tests by simply changing the specimen mounting fixture.

Should I buy the Computerised model or the Analogue model?

Choose the Computerised Izod / Charpy Impact Tester if you need digital test reports for ISO 9001 or NABL audits, require graph plotting and automatic averaging, or test tougher plastics requiring up to 25 J capacity. Choose the Analogue model if you need a reliable economical impact tester for a small QC lab, polytechnic college, or educational institute where digital reporting is not required. Both models comply with the same ASTM and ISO standards.

Why is the pendulum release angle always 150°?

ASTM D 256 and ISO 180 specify that the pendulum must be released from a fixed angle to ensure consistent striking energy across all laboratories. A 150° release angle from the vertical provides the standardized potential energy required by these test methods. All our impact testers are designed to comply with this requirement.

Why are there four (or five) different scales on the same machine?

Different plastic materials absorb very different impact energies. Brittle specimens may absorb only 0.1–0.5 J, while tough engineering plastics may absorb 15–20 J or more. Selecting the correct scale ensures maximum measurement accuracy — a low-energy scale gives better resolution for small values, while higher scales handle tougher specimens. The operator selects the appropriate scale based on expected impact energy.

Do I need a notch cutter separately?

Yes. Izod and Charpy tests require a precisely machined V-notch (typically 2.54 mm deep with 0.25 mm radius). Since notch geometry directly affects test results, accurate preparation is essential. We strongly recommend a Motorized Notch Cutter along with the impact tester, and a Micrometer Notch Verification Jig for checking notch dimensions before testing.

Can the same machine test composites and FRP samples?

Yes, within the machine’s capacity. The Computerised 25 J model can test most laminated composites and lighter FRP samples. For higher-energy composite testing or thick FRP laminates, higher-capacity models up to 50 J can be provided on request.

What units are the impact results reported in?

The Computerised model reports impact strength in Joules per metre (J/m) as per ASTM D 256, kg-cm/cm as per IS standards, and Joules as per ISO 180. The software automatically converts between units. The Analogue model displays energy in Joules, and conversion to other units is done manually using specimen dimensions.

Do you provide installation and training?

Yes. We provide free online installation, commissioning, and operator training. On-site installation and training can also be arranged on a chargeable basis depending on location and requirements.