Instron® offers the SI-1 Series of pendulum impact testers designed for testing metals in accordance with ASTM E23. Five models provide energy ranges from 25 - 300 ft-lbs (33.8 - 406.7 J).

The SI-1 Series is engineered for maximum accuracy, simplicity of design, ease of operation and safety, and performs standard notched bar impact tests. The series can be equipped with options for tension impact testing. Two models, SI-1C3 and SI-1K3, support verification with the National Institute of Standards and Technology (NIST).

Principle of OperationThe basic model consists of a heavy steel base on which the specimen holder (anvil) and a heavy-duty cast steel upright are mounted. On top of the upright, a head assembly contains a shaft supported by precision ball bearings to which the pendulum is attached. A single lever located on top of the head assembly performs three functions: brake, release, and latch. A stop pin prevents accidental release of the pendulum or application of the brake.

The pendulum can be latched in two separate locations known as “high latch” and “low latch”. Since the developed energy is a function of the height from which the pendulum is released, each hammer has dual capacities, one from the high latch and another from the low latch. Both positions comply with the velocity range of ASTM E23.

The variable items in the SI-1 series are:• The weight of the pendulum• The striker type• The indicating dial• The specimen holders

The various combinations of these items on the basic machine result in five models, as described on the next page.

Optional Features• Impulse™ data acquisition and analysis system• Fracta™ Software for PC-based impact energy display• Charpy Impact Striker permits testing system to conform to ISO 148-1: 2006, ISO 148-2: 2008, ISO 148-3: 2008, EN 10045-1: 1990, AS 1544-2: 2003, and GOST 9454: 1978

SI Series Pendulum Impact Testing Machines Model SI-1

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Weight at Striker

Light Pendulumkg 6.03lbs 13.3

Light Pendulum with Weight Attached

kg 12.07lbs 26.6

Heavy Pendulumkg 30.24lbs 66.6

Length of Pendulummm 800in 31.5

Height of Drop

Low Latchmm 573ft 1.88

High Latchmm 1375ft 4.51

Impact Velocity

Low Latchm/s 3.35ft/s 11

High Latchm/s 5.18ft/s 17

DimensionsFloor Space Requirement

mm 610 × 1867in 24 × 73.5

Net Weightkg 510lbs 1125

Height Requirementmm 1725in 68

Charpy Spanmm 40in 1.58

Shipping Dimensionsmm 914 × 914 × 152in 36 × 36 × 60

Shipping Weightkg 590lbs 1300

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POD_SISeriesPendulumImpactTestingMachines_rev3_0511

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SI Series Pendulum Impact Testing Machines | Model SI-1

Five Models to Meet Your Needs

Fracta calibrate metric screenFracta main screen

Optional Software Designed specifically for testing metals to Charpy and Izod standards, Fracta™ Software provides an easy-to-use method for gathering, calculating, and storing impact test results. This software package, which is compatible with Windows® XP operating systems and networks, includes:• Angular encoder• USB communications box• Mounting hardware and interconnect cables

SI-1A

SI-1B

SI-1C3

SI-1D3

SI-1K3 Charpy Only

Capacity (when pendulum released from low latch position)

J 33.9 33.9 169.5 33.9 (Light Pendulum) 169.4 (Heavy Pendulum) 169.5

ft-lbs 25 25 125 25 (Light Pendulum)125 (Heavy Pendulum) 125

Capacity with Weights (when pendulum released from low latch position)

J-

67.8-

67.8 (Light Pendulum)-

ft-lbs 50 50 (Light Pendulum)

Capacity (when pendulum released from high latch position)

J 81.3 81.3 406.7 81.3 (Light Pendulum)406.7 (Heavy Pendulum) 406.7

ft-lbs 60 60 300 60 (Light Pendulum)300 (Heavy Pendulum) 300

Capacity with Weights (when pendulum released from high latch position)

J-

162.7-

162.7 (Light Pendulum)-

ft-lbs 120 (Light Pendulum)120

Dial Indicator Increments (Metric/English) 0.25 J or 0.25 ft-lbs

0.25 J or 0.25 ft-lbs

2.0 J and 1.0 ft-lbs

0.25 J or 0.25 ft-lbs (Light Pendulum) 2.0 J or 1.0 ft-lbss (Heavy Pendulum)

2.0 J and 1.0 ft-lbs

Dial Indicator Increments with Weights (Metric/English)

J-

0.50- 0.5 J or 0.5 ft-lbs (Light Pendulum) -

ft-lbs 0.50

Bolt-on Weights Included - p - p -

Number of Pendulums Supplied 1 1 1 2 1

Supplied with Charpy & Izod Anvils, Strikers and Supports for Testing 10 × 10 mm Specimens***

p p p p p**

Designed in Accordance with ASTM E23 - - p p* p

NIST Charpy Testing (formerly Watertown Specimen Standards) Capability - - p p* p

*When using high-capacity pendulum assembly**Supplied only with Charpy fixtures***Modification parts necessary for testing oversized and subsize specimens available upon request