ASTM C719 Elastomeric Joint Sealant Adhesion/Cohesion Test

Information on the most widely used ASTM standards within the materials testing industry

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Mechanical testing of industrial products and components is essential to ensure their load-bearing, fatigue resistance, and impact resistance, directly preventing production accidents and ensuring stable operation of equipment. UnitedTest can cover a full range of tests including tensile, hardness, and fatigue, complying with national and international standards, and provides customized industrial mechanical testing solutions.

Mechanical testing in the plastic pipe industry determines ring stiffness, impact resistance, and tensile performance, directly preventing pipe bursts and deformation risks. UnitedTest can cover full-dimensional mechanical testing of pipes, complies with ISO,ASTM,EN et.c, international standards, and provides customized testing solutions.

In the construction engineering and building materials industry, mechanical testing determines the compressive and tensile properties of materials such as concrete and steel, which is core to ensuring the safety and durability of buildings. UnitedTest can cover the full range of building material mechanical tests, complies with ISO, ASTM international standards, and provides customized testing solutions for compressive, tensile, and other properties.

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Mechanical testing in the packaging industry determines the packaging's resistance to compression, impact, and tension, directly ensuring the safety of contents during storage and transportation. UnitedTest can cover comprehensive mechanical testing for packaging, complying with ISO, ASTM Standards, and provides customized testing solutions for compression, drop, tear, and more.

Mechanical testing in the transportation industry concerns the load-bearing and fatigue resistance performance of core components such as vehicles, tracks, and containers, directly ensuring transport safety and equipment durability. UnitedTest can cover mechanical testing for all types of transportation materials, complying with national and international standards, and provides customized testing solutions including tensile, fatigue, and impact tests.

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Testing of polymer materials covers mechanical, thermal, and chemical properties, verifying strength, heat resistance, composition, and ensuring product quality and compliance.

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Testing of rubber and elastomers is used to assess the various properties and performance of materials under different conditions. This is crucial for ensuring the safety, functionality, and quality of rubber and elastomer products used in industries such as automotive, construction, consumer goods, and aerospace.

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Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

Compression test assesses material resistance to compressive loads, measuring strength/deformation critical for quality validation. UnitedTest offers compression testing machines compliant with ASTM/ISO standards, providing tailored solutions for concrete, plastics, metals and industrial components.

Flexural & Bend tests evaluate material resistance to bending forces, measuring strength, stiffness and ductility for quality assurance. UnitedTest provides flexural testing machines (3-point/4-point bend) compliant with ASTM/ISO standards, offering tailored solutions for composites, plastics, metals and construction materials.

Torsion Test evaluates material resistance to rotational forces, measuring torsional strength/ductility critical for fasteners, insulators, shafts. UnitedTest offers torsion testers compliant with ASTM A938/ISO 16047, providing tailored solutions for automotive, aerospace, fastener industries.

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Tear & Shear Test evaluates material resistance to tearing and shearing forces, measuring critical strength parameters for quality control. Tear tests (Elmendorf/trouser/trapezoidal) assess resistance to crack propagation in films/fabrics, while shear tests measure resistance to parallel forces in joints/bolts. UnitedTest provides universal testing machines (10KN-600KN) with specialized fixtures for both tests, compliant with ASTM D624/D3164 and ISO standards, serving automotive, packaging and construction industries.

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Pressure test evaluates material/component resistance to static/dynamic pressure, critical for sealing, strength and safety validation. UnitedTest offers pressure testing machines compliant with ASTM/ISO standards, covering burst, hold-pressure tests, and tailored solutions for industrial, automotive & medical sectors.

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ASTM C719 Elastomeric Sealant Cyclic Movement Tester | Hockman Cycle Test Machine | UnitedTest

ASTM C719 evaluates adhesion and cohesion performance of elastomeric joint sealants via Hockman cyclic movement, water immersion and temperature variation. UnitedTest manufactures ASTM C719 compliant sealant testing machines for construction sealant durability qualification.

ASTM C719 is an accelerated laboratory test method formally known as the Hockman Cycle test, designed to assess adhesion and cohesion properties of elastomeric joint sealants under dynamic cyclic building conditions. The standardized procedure exposes sealant joint assemblies to combined cyclic extension and compression movement, continuous water immersion, and fluctuating temperature changes to simulate real-world exterior building service stress.

This test method is widely adopted for evaluating elastomeric construction sealants installed in dynamically moving building joints, including facade expansion joints, window perimeter joints, curtain wall seams, and exterior structural gaps. It effectively identifies adhesive delamination, cohesive cracking, and material fatigue failure under long-term cyclic environmental and mechanical loading, supporting sealant formulation improvement, product classification, batch quality control, and construction material compliance certification.

UnitedTest designs and manufactures high-precision ASTM C719 Hockman Cycle sealant testing machines. Our equipment accurately replicates cyclic movement, water immersion and temperature cycling conditions, delivering consistent and reliable adhesion and cohesion test results for building sealant R&D, factory quality assurance and third-party laboratory validation.

Core principle

A sealant bead is installed between two rigid substrates (standard: portland cement mortar, float glass, aluminum) at an original joint width of 0.500 in. (12.7 mm). After curing/conditioning, the specimen is:

Immersed in water to introduce moisture/plasticization effects,

Compressed and heat-aged in an oven to simulate summer/high-temperature compression,

Cycled in a compression–extension machine at room temperature to check movement capability,

Further cycled with combined high-temperature compression and low-temperature extension to check adhesion/cohesion under thermal movement.

Performance is judged by visual inspection for adhesive failure (sealant–substrate bond loss), cohesive failure (internal sealant cracking/tearing), deformation, and bubble formation.

The method is named the Hockman Cycle after Arthur Hockman, who developed it at the National Bureau of Standards.

Test Equipment required of ASTM C719 Elastomeric Joint Sealant Adhesion/Cohesion Test (Hockman Cycle Test)

Compression‑Extension Cycling Machine	Can use UnitedTest Universal Tensile testing machine, Automatically compresses and extends specimens at fixed rate of 1/8 in/h (3.2 mm/h); equipped with high‑strength specimen grips for elastomeric sealant resistance.
Test substrates	Constant‑temperature cold box maintaining ‑26.1 °C ±1.7 °C for low‑temperature extension cycles.
Forced‑draft hot air oven	Controlled at 70 °C ±2 °C for hot‑compression ageing steps.
C‑clamps and metal fixture assembly	Mechanical hardware to hold specimens fixed at compressed joint dimension during oven exposure.
Anti‑adherent casting spacers	PTFE or PE release material for specimen casting.

Test Specimen Information:

Replicates: Minimum three specimens per substrate type.
Standard mandatory substrates: Portland‑cement mortar blocks, float glass, 6063‑T5 / 6061‑T6 anodized aluminium alloy plates. Brick, marble, wood or other substrates may be agreed between parties for custom testing.
Standard sealant bead dimension: 0.500 in × 0.500 in × 2 in (12.7 mm ×12.7 mm ×50.8 mm). Original joint gap width = 0.500 in (12.7 mm).
Specimen assembly: Two matching substrate blocks form the joint cavity. Anti‑adherent PTFE / polyethylene casting spacers define sealant geometry. Primer shall be applied following sealant manufacturer recommendations.

Test Parameters & Stipulations

1. Mechanical movement rate: Compression‑extension speed = 3.2 mm/h (1/8 inch per hour) (very slow displacement rate).

2. Starting original joint width: 0.500 in (12.7 mm). Compression dimension (C) and extension dimension (E) follow movement‑class table (e.g. ±12.5 %, ±20 %, ±25 % movement amplitude).

3. Temperature set‑points:

- Hot oven ageing: 70 °C (158 °F)

- Cold‑chamber extension: −26.1 °C (−15 °F)

4. Timing sequences:

- Initial water immersion: 7 days

- Hot oven under fixed compression: 7 days

- Room‑temperature automated cycles: total 10 full compression‑extension cycles

- Each high‑temp compression step: 16–20 hours

- Low‑temperature extension is performed inside cold chamber.

- Total high‑low temperature alternating cycles: 10 repetitions maximum. Test terminates early if specimen suffers full adhesive / cohesive failure before completing ten cycles.

Test Procedures for ASTM C719 Elastomeric Joint Sealant Adhesion/Cohesion Test (Hockman Cycle Test)

Prepare test specimens with selected substrates and primer; complete full curing schedule for single‑component or multi‑component sealant. Allow specimens to return to standard ambient temperature after high‑temperature curing phases.
Immerse specimens in distilled / de‑ionised water for 7 days.
Take specimens out of water; manually flex each specimen twice to inspect bond strength. Mount intact specimens into C‑clamp fixtures and compress to target dimension (Dimension C for the movement class).
Place clamped compressed specimens in 70 °C forced‑draft oven for 7 days.
Remove from oven; release clamps and cool specimens to standard room temperature. Install specimens inside compression‑extension machine; run 10 automated full compression‑extension cycles at room temperature at rate of 3.2 mm/h.
After finishing ten room‑temperature cycles, extend specimens to maximum dimension E; fit separators, remove specimens and visually inspect for adhesive / cohesive failure. Discard any specimens showing total through‑section failure at this point.
For surviving specimens: compress back to dimension C with clamps and separators; place compressed specimens in 70 °C oven for 16‑20 hours.
Retrieve specimens from oven; release clamps and cool for 2‑3 hours. Transfer specimens into cold chamber held at −26.1 °C. Starting from compressed dimension C, extend specimens to dimension E inside cold environment at the defined 3.2 mm/h rate. Fit separators, take specimens out and allow to warm up for two hours at ambient condition; perform visual inspection for failure, deformation or bubbles.
Repeat steps 7‑8 for up to 10 total high‑low temperature cycles. The test stops early if complete adhesive or cohesive failure occurs.

Industry Application Fields

ASTM C719‑22 (Hockman Cycle) is widely used across North‑American building and construction industries. Main applications:

Facade and curtain‑wall elastomeric joint sealants;
Glazing sealants for windows and building envelopes;
Precast‑concrete joint sealants;
Construction material third‑party laboratories, sealant R&D and quality‑control departments;
Product certification, specification and tender compliance for dynamic moving building joints.
Note: This test evaluates sealant performance under proper primer and installation conditions only; it does not simulate failures caused by poor joint geometry, wrong sealant selection or on‑site application mistakes.

Related Stadard:

ISO 8339	Building construction - Sealants - Determination of tensile properties (Extension to break)
ASTM C1135	Standard Test Method for Determining Tensile Adhesion Properties of Structural Sealants
ISO 8340	Building construction - Sealants - Determination of tensile properties at maintained extension
ASTM C1635	Adhesion/cohesion at fixed extension, including water immersion; explicitly comparable to ISO 8340 and ISO 10590.
ISO 7389	Building construction - Jointing products - Determination of elastic recovery of sealants
GB/T 13477.17	Test method for building sealants—Part 17：Determination of elastic recovery
GB/T 13477.8	Test method for building sealants—Part 8：Determination of tensile properties
ISO 10590	Building Construction Sealants Determination of Tensile Properties of Sealants at Maintained Extension After Immersion in Water
ISO 19862	Buildings and civil engineering works — Sealants — Durability to extension compression cycling under accelerated weathering
ASTM C719	Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
ASTM C109	Compressive‑strength test for hydraulic‑cement mortars

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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.

UnitedTest supplies ISO 8339 compliant tensile test fixture for building construction sealants. Standard sealant joint specimen grips for UTM, test elongation at break & secant modulus, lab certified, custom substrate holders available.

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.

ASTM C719‑22 Hockman Cycle Tester | Elastomeric Sealant Cyclic Movement Test Machine | UnitedTest

Q1: What is ASTM C719‑22 Hockman Cycle test and why is it important?

A: ASTM C719‑22, also known as Hockman Cycle test, evaluates adhesion and cohesion performance of elastomeric building joint sealants under combined water immersion, high‑temperature compression, low‑temperature extension and mechanical cyclic joint movement. Unlike simple tensile tests, it simulates real‑world service stresses: rainwater intrusion, hot‑weather compression‑set risk and cold‑weather stiffening together with thermally driven joint opening‑closing cycles. It reveals failure modes such as interfacial delamination, cohesive cracking, permanent deformation and internal bubble formation that basic mechanical tests cannot detect. It is a widely‑accepted pass‑fail benchmark for elastomeric sealants used in North‑American construction projects, helping screen product quality and reduce in‑field water‑leakage risks.

Q2: What is the most significant difference between ASTM C719‑22 and ISO 19862:2015?

ASTM C719‑22: No UV / artificial light weathering. Ageing comes only from water soaking, +70 °C heat and −26.1 °C cold. Mechanical displacement speed is extremely slow at 3.2 mm/h. It alternates hot compression and cold extension cycles.
ISO 19862: Runs compression‑extension cycles inside UV‑xenon accelerated weathering chamber. No deep‑freeze low‑temperature conditioning. Deformation speed is 5.5 ± 0.7 mm/min. ASTM C719 focuses on thermal‑humidity‑mechanical stress; ISO 19862 highlights photo‑oxidative UV degradation together with cyclic movement.

Q3: What substrates are required for ASTM C719‑22 specimens? Can I test other substrates?

A: Three standard substrates are mandatory: Portland‑cement mortar blocks, clear float glass, and 6063‑T5 / 6061‑T6 anodized aluminium alloy plates. Upon mutual agreement between parties, brick, marble, wood or other custom substrates may replace or supplement the standard set. Every substrate requires minimum three replicate specimens.

Q4: What counts as specimen failure for ASTM C719‑22? Is there an edge‑defect exclusion zone?

A: A specimen fails when complete adhesive failure or complete cohesive failure occurs across the joint cross‑section. Partial minor cracking or surface defects are not considered test termination conditions. Unlike ISO 19862, ASTM C719‑22 has no formal 2 mm edge‑zone exclusion rule. All defects shall be visually observed and fully documented in test report, regardless of position on the sealant bead.

Q5: What is the full sequence and total cycle count of Hockman Cycle test?

Initial 7‑day distilled‑water immersion;
7‑day hot oven conditioning under fixed compression at 70 °C;
10 automated room‑temperature compression‑extension cycles;
Then repeat alternating hot‑compression (16‑20 h @70 °C) and cold‑extension (−26.1 °C) steps for maximum 10 high‑low temperature cycles. If full through‑section failure happens before finishing ten high‑low cycles, the test for that specimen ends early. Surviving 10 full high‑low cycles means the specimen passes this test.

Q6: What mechanical displacement rate must be followed in ASTM C719‑22?

A: The compression‑extension machine must run at 1/8 inch per hour (3.2 mm/h), a very slow constant displacement rate. This low speed simulates slow thermal dimensional change of building joints, different from fast tensile test rates.

Q7: What key lab equipment do I need to complete a full ASTM C719‑22 test?

A: Automated compression‑extension cycling machine (3.2 mm/h speed control); cold chamber stable at −26.1 °C; forced‑draft hot oven (70 °C); C‑clamps and compression fixture assembly; anti‑adherent casting spacers; water immersion tank; standard‑condition curing room; substrate cleaning chemicals and separators for visual inspection.

Q8: Why choose ASTM C719 Hockman Cycle Sealant Tester, Elastomeric Joint Adhesion/Cohesion Test Machine from UnitedTest?

A: UnitedTest manufactures ASTM C719‑22 Hockman Cycle test machine for elastomeric joint sealants. Our complete system evaluates sealant adhesion‑cohesion under water immersion, hot compression and low‑temperature cyclic movement. Custom fixtures, precise 3.2 mm/h displacement control for construction material laboratories. UnitedTest builds standards-based Hockman-cycle systems with modular oven, cold-chamber, immersion, and servo-cyclic controls. We help labs replace manual clamping with repeatable automation, reduce inter-operator variation, and generate defensible ASTM C719 data for product development, ASTM C920 specification support, and global project qualification.

UnitedTest delivers full‑set turnkey testing hardware complying fully with ASTM C719‑22 “Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)”, the well‑known North‑American standard for dynamic sealant joint performance evaluation.

Exterior building elastomeric sealants suffer water soaking, high‑temperature compression‑set, cold‑weather stiffening and slow cyclic opening‑closing movements driven by thermal expansion and contraction. Conventional tensile tests or static ageing tests cannot reproduce this combined set of real‑world stresses. The ASTM C719‑22 Hockman cycle procedure subjects sealant specimens to sequential water immersion, hot compression conditioning, room‑temperature mechanical cycles, plus repeated high‑temperature compression and −26.1 °C cold‑extension cycles, up to ten total thermal‑mechanical cycles, to assess adhesion, cohesion, permanent deformation and bubble generation.

UnitedTest integrated ASTM C719‑22 Hockman cycle test solution includes:

Precision servo‑driven compression‑extension cycling tester, strictly executing the mandatory 3.2 mm/h (1/8 in/h) ultra‑slow displacement rate for sealant joint movement. Multi‑specimen fixture design supports parallel testing of multiple samples.
Custom‑manufactured specimen holders, C‑clamp compression fixtures and anti‑adherent casting spacers, compatible with mortar, float glass and aluminium substrates as required by ASTM C719‑22. Supports ±12.5 %, ±20 %, ±25 % movement‑class setup.
Matching environmental hardware: forced‑draft hot‑air oven (70 °C ±2 °C), low‑temperature cold chamber maintaining −26.1 °C ±1.7 °C, water‑immersion tank for specimen pre‑treatment.
Accessory kits for substrate preparation, cleaning consumables and dimension separators for post‑cycle visual inspection.
Software supports test‑sequence programming, cycle‑count logging and exporting raw observation data to assist generating ASTM‑compliant laboratory reports.

Our test system strictly follows all key clauses: specimen curing rules, 7‑day water immersion, 7‑day hot compression, 10 room‑temperature cycles and up to 10 high‑low alternating temperature cycles, together with full visual‑inspection workflow.

This Hockman cycle test equipment is widely deployed in sealant manufacturer R&D centres, third‑party construction‑material testing laboratories and civil‑engineering quality‑control labs globally. It supports new‑product formulation development, incoming‑batch QC, product certification and tender‑spec compliance for curtain‑wall, glazing and precast‑concrete elastomeric sealant products.

UnitedTest engineering team offers fixture customisation, equipment installation, on‑site operational training and technical consultation for ASTM C719‑22 standard operation. We also supply matching test systems for related sealant standards including ISO 19862, ASTM C794, ISO 8339 and ISO 11431.

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