ISO 16525-6 Pendulum-Type Shear Impact Test for Conductive Adhesives

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ISO 16525-6 Pendulum-type Shear Impact Tester for Isotropic Electrically Conductive Adhesives | UnitedTest

UnitedTest manufactures testing machines complying with ISO 16525-6. This standard specifies pendulum-driven shear impact test to evaluate impact resistance of bonded joints using isotropic electrically conductive adhesives (IECA) for electronic component assembly.

ISO 16525-6 Adhesives — Test methods for isotropic electrically conductive adhesives — Part 6: Determination of pendulum-type shear impact

ISO 16525-6 specifies a pendulum-driven shear impact test method used to evaluate the impact resistance performance of bonded joints formed by isotropic electrically conductive adhesives (IECA). This test standard is mainly applied for electronic component mounting applications, helping labs quantify the shear impact load and failure behaviour of conductive adhesive bonds under sudden impact loading. UnitedTest provides professional test equipment that meets the requirements of ISO 16525-6 for quality control and material research of electrically conductive adhesives.

Test Principle

A swinging pendulum hammer delivers shear‑mode impact loading onto miniature bonded adhesive specimens.

An accelerometer mounted on the pendulum hammer captures acceleration during impact.
A non‑contact displacement (laser) sensor records hammer velocity before and after specimen fracture.
Total impact energy, maximum impact force and maximum impact energy are computed from velocity‑change and acceleration data.
Fracture mode of the adhesive joint is assessed after failure, following ISO 10365 failure‑pattern classification.

Test Specimen Details

Three‑layer miniature bonded assembly: two square copper adherends bonded by a layer of isotropic electrically conductive adhesive (IECA).

Dimension:

- Bonded square side length: 2 mm ~ 3 mm, tolerance ± 0.5 mm.

- Each copper adherend thickness: 0.8 mm (tolerance ± 0.1 mm).

- IECA adhesive bond‑line thickness: 0.1 mm (tolerance ± 0.02 mm).

Test Equipment required for ISO 16525-6 Pendulum-Type Shear Impact Test for Conductive Adhesives

Pendulum-type impact testing machine	Recommend UnitedTest Charpy/IZOD impact testing machine. - Pendulum nominal potential energy: E_P=0.1J+5%; hammer impact speed range: 1.0 m/s ~ 1.2 m/s. - Pendulum hammer assembly: high‑density striker (tungsten preferred), low‑elastic‑loss swing arm; striker tip geometry specified (10° angle, 2 mm contact width). - Automatic hammer release (electromagnet recommended); independent rotation shafts to minimise friction. Ten repeated free‑swing speed measurements shall fall within a 2 % range.
Specimen‑fixing stage	rigid anti‑vibration fixture with X‑Y‑Z micro‑positioning to align striker centre with specimen impact centre.
Sensing instruments	Accelerometer: mass < 1 % of hammer mass; withstand 100 G peak acceleration; sampling frequency ≥ 100 kHz, mounted near impact point. Laser displacement sensor (non‑contact): installed ≤ 5 mm from impact point; resolution ≤ 0.01 mm; sampling frequency ≥ 25 kHz. Optical observation device: minimum 5× magnification for pre‑test alignment verification.
Signal processing chain	accelerometer charge amplifier, displacement‑sensor amplifier, AD converter and personal computer for data acquisition and calculation.

Core Test Parameters & Mandatory Stipulations

Nominal pendulum potential energy	0.1 J ± 5 %
Hammer impact velocity	1.0 ~ 1.2 m/s
Accelerometer sampling rate	≥ 100 kHz
Displacement‑sensor sampling rate	≥ 25 kHz
Adhesive bond‑line thickness	0.1 mm ± 0.02 mm
Specimen adherend thickness	0.8 mm ± 0.1 mm
Specimen bonded side length	2‑3 mm ± 0.5 mm
Valid test criterion	Measured specimen total impact energy < 80 % of initial pendulum potential energy

Specimen mounting: zero gap between specimen bottom and fixture base; impact‑centre alignment error ≤ 1/10 of specimen side dimension. No mechanical interference between specimen and fixture during impact event.
Calculated output quantities:

Total impact energy (E, joule): derived from hammer mass and velocities immediately before v1 and after v2 impact, using kinetic‑energy difference formula. Annex B provides velocity‑correction formulas to compensate for pendulum friction and sensor misalignment errors.
Maximum force (N, newton): peak load computed from hammer mass and measured acceleration (N=m.a).
Maximum impact energy: energy integral of load‑displacement curve up to the point of maximum force, obtained by double‑time‑integration of acceleration signal for displacement data.

Test Procedures of ISO 16525-6 Pendulum-Type Shear Impact Test for Conductive Adhesives

Pre‑check pendulum‑hammer free‑swing performance, verify velocity repeatability within 2 %.
Prepare and pre‑condition specimens in standard atmosphere; perform X‑ray void screening, select qualified samples.
Install specimen on fixing stage; use ≥ 5× magnifier to precisely align striker centre with specimen impact centre; confirm no fixture‑specimen mechanical interference.
Set pendulum arm initial angle; record pendulum static‑force F_H and impact‑point distance L_H to compute theoretical potential energy and theoretical hammer speed.
Trigger automatic pendulum release; capture acceleration and displacement‑sensor time‑domain data throughout impact event.
After impact, recover fractured specimen, observe and document fracture mode.
Process raw sensor data, apply Annex B correction if needed; calculate total impact energy, maximum force and maximum impact energy.
Reject invalid measurements where specimen absorbed energy ≥ 80 % of pendulum initial potential energy.

Test Applications (Industry Fields)

This test targets electronics manufacturing and micro‑assembly industry:

Characterise isotropic electrically‑conductive adhesives used for surface‑mount device attachment, semiconductor die‑attach, printed‑circuit‑board component mounting.
Used for adhesive material development, batch quality control, supplier‑purchaser performance comparison, and reliability assessment for electronic assemblies subject to drop, shock and mechanical‑impact service conditions

Related Stadard:

ISO 9653	Adhesives - Test method for shear impact strength of adhesive bonds
ASTM D950	Standard Test Method for Impact Strength of Adhesive Bonds
GB/T 6328	Test method for shear impact strength of adhesive bonds
EN 29653	ADHESIVES - TEST METHOD FOR SHEAR IMPACT STRENGTH OF ADHESIVE BONDS
JIS K 6855	Testing methods for impact shear strength of adhesive bonds
ISO 11343	Adhesives — Determination of dynamic resistance to cleavage of high-strength adhesive bonds under impact wedge conditions — Wedge impact method
ISO 16525-6	Adhesives. Test methods for isotropic electrically conductive adhesives. Determination of pendulum-type shear impact
ISO 179	Plastics: determination of Charpy impact properties

Importance of the ISO 16525-6 Pendulum-Type Shear Impact Test for Conductive Adhesives

ICAs are the lead‑free/Pb‑free, low‑temperature alternative to solder for mounting components on substrates. They are heavily‑filled (Ag flake) epoxy or similar systems — strong and stiff, but intrinsically brittle with low peel/impact toughness. A quasi‑static lap‑shear number (ISO 16525‑4) can look excellent while the joint shatters under a millisecond load.
Drop and shock are the dominant field failure mode for portable/wearable electronics. Impact energy, not static shear strength, is what governs whether a joint survives a phone drop, a connector mating shock, or handling during assembly.
Strain‑rate sensitivity. At ~1 m/s the polymer matrix has no time to relax; the test exposes rate‑dependent embrittlement, and it can be run after environmental conditioning to quantify toughness loss after thermal cycling or moisture exposure.
Three numbers instead of one. E (total absorbed energy), L (peak force) and I (energy to peak force) separate crack initiation from crack propagation — essential for ranking toughened vs. untoughened formulations, for filler/resin optimisation, and for input to drop‑simulation models.
Micro‑scale validity. Because joints in electronics are millimetre‑sized, a 2–3 mm specimen with a 0.1 mm bondline reproduces the real constraint and stress state of a component pad — something conventional macro impact tests cannot do.
Quality gate. Combined with X‑ray void screening, the drying protocol and ISO 10365 fracture‑mode classification, the method gives suppliers and OEMs a lot‑to‑lot, reproducible acceptance criterion (10 specimens × 3 repeats in Annex A), and distinguishes true adhesive failure (poor wetting/voids) from cohesive failure (bulk toughness limit).
Safety/environment note: the standard requires normal laboratory practice awareness and warns that some procedures may generate hazardous substances or waste.

Keywords: ISO 16525-6, pendulum-type shear impact test, isotropic electrically conductive adhesives, IECA, conductive adhesive bonded joint, shear impact resistance, electronic component mounting, adhesive impact test, adhesive shear tester, electrically conductive adhesive testing machine, adhesive joint impact failure, lab adhesive test equipment, UnitedTest adhesive tester, electronics packaging adhesive test, pendulum impact tester

Charpy Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Charpy impact is defined as the kinetic energy needed to initiate fracture and continue the fracture until the specimen is broken.

A single column tensile tester is a sophisticated material testing instrument designed for measuring mechanical properties of various materials under tension, compression, bending, shear, and other loading conditions. As the name suggests, it features a single vertical column supporting a moving crosshead that applies force to test specimens.

Vice Tensile test fixture for plastics is based on the test standatd ASTM D638, determination of the tensile properties of unreinforced and reinforced plastics in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, speed.

Q1: What is ISO 16525‑6 for?

A: ISO 16525‑6:2014 defines a pendulum‑type shear‑impact test exclusively for isotropic electrically conductive adhesives (IECA) used in electronic component mounting. It measures dynamic shear‑impact performance including total impact energy, maximum impact force and maximum impact energy for miniature adhesive bonded joints under high‑speed shear shock loading.

Q2: Why is ISO 16525‑6 test important for isotropic electrically conductive adhesives?

A: Static shear tests (ISO 16525‑4) only deliver quasi‑static strength data. Real‑world electronics suffer drop, bump and mechanical shock with high‑strain‑rate loading. This pendulum shear‑impact test simulates real‑service sudden shock conditions. It evaluates dynamic toughness, captures force‑displacement curves and fracture modes, helping engineers predict joint failure risk for die‑attach and SMD assemblies. It provides unified international test baseline for adhesive formulation optimisation, material comparison, incoming quality inspection and contract acceptance criteria in electronics manufacturing.

Q3: What is the difference between ISO 9653 and ISO 16525‑6?

A: ISO 9653 is a general pendulum shear‑impact standard for ordinary structural adhesives. ISO 16525‑6 is custom‑tailored for tiny electronic IECA joints: it specifies miniature 2‑3 mm bonded specimens, strict 0.1 mm bond‑line thickness, high‑speed accelerometer (≥ 100 kHz) and laser displacement sensor (≥ 25 kHz), special specimen preparation rules (X‑ray void inspection, post‑cut drying), and calculation for both impact force and absorbed energy, which ISO 9653 does not cover for micro‑electronic adhesive joints.

Q4: What are the mandatory key parameters of ISO 16525‑6 tester?

A:Pendulum nominal potential energy: 0.1 J ± 5 %

Hammer impact speed: 1.0 ~ 1.2 m/s

Accelerometer sampling frequency ≥ 100 kHz; accelerometer mass < 1 % of hammer mass

Laser displacement sensor sampling ≥ 25 kHz, resolution ≤ 0.01 mm

Hammer free‑swing speed repeatability ≤ 2 % for 10 runs

Micro‑positioning specimen stage for X‑Y‑Z alignment; ≥ 5× magnification alignment scope.

Q5: Why must specimens be dried after cutting?

A: Cutting process introduces moisture absorption inside IECA. Undried specimens show large strength deviation and messy mixed fracture modes. The standard requires either oven‑dry at 100 °C for 2 hours or seven‑day ambient air‑drying, to eliminate moisture‑caused test error before impact testing.

Q6: Why do we need X‑ray inspection for specimens?

A: Voids inside conductive adhesive significantly lower impact‑resistance and create inconsistent test results. ISO 16525‑6 rejects specimens with void area over 20 % or more than 10 visible voids. X‑ray screening pre‑screens defective samples to reduce data scatter and ensure valid test outputs.

Q7: Can I use standard Charpy / Izod impact machine for ISO 16525‑6 test?

A: Normally no. Ordinary Charpy‑Izod machines are designed for high‑energy metal or plastic samples. ISO 16525‑6 requires very low nominal 0.1 J pendulum energy, 1.0‑1.2 m/s impact velocity, miniature specimen fixture, high‑frequency accelerometer and laser displacement sensor, and special tungsten striker geometry. General‑purpose pendulum impactors cannot meet all standard technical requirements. You need a dedicated instrumented pendulum shear‑impact tester for isotropic conductive adhesives.

Q8: Which industries use ISO 16525‑6 testing?

A: Electronics packaging, semiconductor die‑attach, printed‑circuit‑board SMD assembly, conductive adhesive R&D & manufacturing, third‑party material‑testing laboratories, quality‑control departments for consumer electronics, automotive electronics, where isotropic electrically conductive adhesives replace traditional solder joints.

Q9: Which other ISO standards belong to the ISO 16525 series for conductive adhesives?

A: ISO 16525‑1: General test methods

ISO 16525‑2: Electrical characteristics

ISO 16525‑4: Static shear strength & electrical resistance

ISO 16525‑5: Shear fatigue

ISO 16525‑7: Environmental test methods

ISO 16525‑8: Electrochemical‑migration test

ISO 16525‑9: High‑speed signal‑transmission characteristics.

Q10: Why choose ISO 16525‑6 Pendulum‑Type Shear Impact Tester from UnitedTest?

A: UnitedTest is professional manufacturer of ISO 16525‑6 pendulum‑type shear impact tester for isotropic electrically conductive adhesives. Instrumented impact system delivers total impact energy, maximum force and load‑displacement curves, fully compliant with ISO 16525‑6:2014 for electronic adhesive lab testing, R&D and quality control.

UnitedTest is an original equipment manufacturer supplying fully‑compliant ISO 16525‑6:2014 pendulum‑type shear impact testing machines for isotropic electrically conductive adhesives (IECA). Our instrumented pendulum impact test system is purpose‑built for miniature electronic adhesive joints in semiconductor die‑attach, SMD component mounting and PCB assembly applications.

Unlike general‑purpose Charpy or Izod impact testers, UnitedTest’s ISO 16525‑6 impact tester implements the standard‑required 0.1 J nominal pendulum potential energy, 1.0‑1.2 m/s hammer impact speed, high‑frequency accelerometer (≥ 100 kHz), non‑contact laser displacement sensor (≥ 25 kHz), precision X‑Y‑Z micro‑positioning specimen stage and standard‑specified tungsten striker geometry.

Our test software automatically calculates total impact energy, maximum impact force, maximum impact energy, applies Annex B velocity correction, records load‑displacement curves and supports ISO 16525‑6‑compliant test‑report export. Suitable for conductive adhesive material research‑and‑development, batch quality inspection, third‑party laboratory certification and supplier‑customer performance comparison.

Product features

✅ Fully conforms to ISO 16525‑6:2014 standard for isotropic electrically conductive adhesives pendulum shear‑impact test

✅ Instrumented pendulum system with accelerometer + laser displacement sensor for dynamic force‑energy acquisition

✅ Standard‑matched 0.1 J pendulum potential energy; adjustable impact speed 1.0 ~ 1.2 m/s

✅ High‑speed sampling: accelerometer ≥ 100 kHz; laser displacement sensor ≥ 25 kHz

✅ Precision micro‑manipulator specimen‑fixing stage for accurate striker‑specimen alignment

✅ Built‑in Annex B data correction algorithm to compensate pendulum friction & position misalignment error

✅ Output key test indicators: total impact energy, maximum force, maximum impact energy, load‑displacement curve

✅ Generate complete ISO 16525‑6‑standard test report for lab documentation & certification

✅ Widely used for isotropic conductive adhesive in semiconductor packaging, consumer electronics, automotive electronics and material‑testing laboratories

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you