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Home >> Application >> By Standard >> ISO >> ISO 5000~9999 >> ISO 7389 Construction Joint Sealant Elastic Recovery Test

ISO 7389 Construction Joint Sealant Elastic Recovery Test

ISO 7389 Sealant Elastic Recovery Tester | UnitedTest

UnitedTest manufactures testing machines complying with ISO 7389 for measuring elastic recovery of building construction jointing sealants. Evaluate sealant elastic recovery after sustained tensile extension for elastomeric sealant quality control.

ISO 7389 defines a laboratory test method to measure the elastic-recovery performance of construction joint sealants after sustained tensile extension. Elastic recovery quantifies how much a sealant can return toward its original dimension after long-term stretching, a core index for evaluating elastomeric sealant quality. UnitedTest supplies professional ISO 7389 compliant sealant testing equipment for construction sealant labs and material quality inspection.

Core Test purpose / principle

A sealant bead is bonded between two parallel substrates, conditioned, extended to a defined elongation, held in that stretched position for a fixed time, released, and allowed to recover. Elastic recovery R is calculated as the recovered portion of the imposed extension: ISO 7389 Construction Joint Sealant Elastic Recovery Test

W_i = initial joint width after conditioning

W_e = width under elongation (e.g. 15.0, 19.2 or 24.0 mm for a 12 mm bead)

W_r = width 1 h after release

Result is reported as a percentage, rounded to the nearest 1%.

A good dynamic-joint sealant should not stay permanently stretched. High elastic recovery means less residual deformation, better re‑sealing of the joint, and lower risk of leakage or debonding under repeated thermal/structural movement.

Specific test methods / elongation options

For a 12 mm initial width the standard gives:

Elongation	Final extended width
25%	15.0 mm
60%	19.2 mm
100%	24.0 mm

Other percentages may be agreed. Extension rate: 5.5 ± 0.7 mm/min. Hold extended for 24 h with spacers, then remove spacers and let recover on a low‑friction surface (e.g. talc‑dusted glass) for 1 h, then measure W_r.

Test Equipment required of ISO 7389 Construction Joint Sealant Elastic Recovery Test

Universal Tensile testing machine	Dual movable/fixed crosshead design with self-aligning swivel universal joint grips to eliminate eccentric off-axis loading. Capable of cross‑head speed at 5.5 ± 0.7 mm/min
Test substrates	Mortar, anodized aluminium or glass (defined in ISO 13640). Alternative substrates may be agreed between parties.
Spacers	- 12 mm × 12 mm anti‑adherent spacer for specimen fabrication. - Spacers of widths 15 mm, 19.2 mm, 24 mm to hold specimens at 25 %, 60 %, 100 % elongation respectively.
Anti‑adherent sheet	Polyethylene (PE) film for casting specimens.
Tools	1. Ventilated convection oven: Capable of maintaining 70±2°C. 2. Water‑immersion container: For accelerated conditioning cycles.

Test Specimen Information:

- Each substrate type requires 3 replicate specimens.

- Sealant bead original dimension: 12 mm width (joint gap) ×12 mm depth.

- Substrate options: mortar, anodized aluminium, glass. Two rigid substrate supports form the joint cavity filled with sealant.

- Avoid air bubbles during filling; sealant surface shall be flush with substrates and spacers. Remove PE anti‑adherent film as early as practicable.

Test Parameters & Stipulations

Extension rate: 5.5±0.7mm/min.

Measure W_i at both ends after removing form spacers; extend; record W_e; hold 24 h; release; measure W_rat both ends after 1 h.

For each width value take the mean of both ends; compute R for each specimen; report mean of three specimens.

Measurements may be taken between contact surfaces only or include them, but the basis must be consistent.

Report must include lab/date, ISO 7389 reference, sealant name/type/colour/batch, substrate, primer, conditioning method, elongation %, individual and mean recovery, and any deviation.

Test Procedures for ISO 7389 Construction Joint Sealant Elastic Recovery Test

1, Condition the specimen, two methods A and B.

2. Remove fabrication spacers, measure initial width W_i at both ends of each specimen and compute average value.

3. Mount specimens in the extension machine; stretch at controlled speed to target elongation. Record extended width W_e.

4. Insert corresponding fixed‑width spacers to sustain elongation for full 24 hours.

5. Take out spacers; place specimen vertically (long‑axis upright) onto low‑friction talc‑glass surface. Do not apply extra force.

6. After exactly 1 hour recovery time, measure post‑recovery width W_r at both specimen ends and average.

7. Compute elastic‑recovery value for each replicate with given formula, calculate arithmetic mean of three specimens.

Industry Application Fields

Building expansion/control joints, façades, curtain walls, cladding, window/door perimeter seals.

Glazing and structural/sealant glazing support testing (together with adhesion/cohesion standards).

Civil engineering joints, bridges/roadway joint sealants (where adopted), prefabricated concrete connections.

Sealant manufacturers (R&D, QC, technical data sheets), independent labs, architects/specifiers, contractors, certification bodies.

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)

Keywords: ISO 7389 tester,sealant elastic recovery test,construction joint sealant test,elastomeric sealant testing,jointing products test,tensile extension sealant test,sealant quality control,building sealant laboratory test,sealant elastic recovery machine,construction material test equipment,sealant mechanical property test,UnitedTest sealant tester. ISO 7389 sealant elastic recovery test machine,sealant elastic‑recovery tester maintained extension,construction joint sealant lab testing equipment,building construction jointing‑products test equipment

Related products and device

ISO 7389 Construction Joint Sealant Tensile Testing Machine

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.

ISO 7389 construction joint sealant test rquipment

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.

ISO 7389 sealant elastic recovery machine

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.

Related Standard

ASTM C1135 Tensile Adhesion Test for Structural Sealants –

ASTM C1135 Standard Test Method for Determining Tensile Adhesion Properties of Structural Sealants

ASTM C1135 measures the tensile stress and elongation behavior of structural sealants when adhered between two rigid substrate panels — replicating the stress state of a structural glazing joint where the sealant acts as a structural link between glass/panel and the metal framing system. Quantify tensile adhesion, tensile stress at graded elongations, ultimate tensile strength and failure mode.

ISO 8339 Tensile Test for Building Sealants (Extension to Break) –

ISO 8339 Building construction — Sealants — Determination of tensile properties (Extension to break)

ISO 8339 defines a laboratory tensile test method to measure full tensile mechanical performance of construction joint sealants by stretching bonded specimens until complete rupture. It quantifies secant modulus and elongation-at-break, which are core material parameters to evaluate elastic deformability and adhesion/cohesion of sealants under tension. It focuses on single-rate tensile extension to full failure, distinct from ISO 8340 which tests sustained constant tensile loading.

ASTM D1002 Lap Shear Test of Adhesively Bonded Metal Specimens –

ASTM D1002 is the most widely used standard test for measuring the apparent shear strength of metal‑to‑metal adhesive single‑lap joints under tension loading. It provides comparative data for adhesive selection, process control, and quality assurance in structural bonding applications. It is the most common test for evaluating adhesive shear performance.

ASTM D897 Tensile Test of Adhesive Bonds –

ASTM D897 prescribed a method for determining the comparative tensile properties of adhesive bonds in a standard specimen when tested under specific conditions. Its primary purpose was to measure the tensile strength of an adhesive bond between two rigid substrates (metal to metal).

ISO 8340 Building Sealant Maintained-Extension Tensile Test –

ISO 8340 Building construction‑Sealants‑Determination of tensile properties at maintained extension

ISO 8340 evaluates sealant performance when kept at constant tensile elongation rather than being pulled until immediate rupture.

FAQs for ISO 7389 Elastic Recovery Test for Building Sealants

Q1: What is ISO 7389 test for sealants?

A1: ISO 7389:2002 is an international laboratory standard that measures elastic recovery of cured construction sealants after maintained tensile extension. It quantifies how much deformation a sealant can bounce‑back after being stretched and held for 24 hours, to tell apart elastomeric sealants from plastic sealant mastics.

Q2: Why is ISO 7389 elastic‑recovery test important for sealant materials?

A2: Building joints expand and contract due to temperature shift and structural movement. High elastic‑recovery means the sealant can return close to its original joint dimension after stretching, minimizing permanent plastic deformation. Sealants with low elastic recovery keep residual opening after displacement, which causes water ingress, air leakage and premature joint failure. ISO 11600 uses ISO 7389 results to classify whether a sealant is “elastomeric” (minimum 60 % elastic recovery). This test supports R‑D formulation optimization, factory QC, third‑party certification and construction material procurement acceptance.

Q3: What are Method A and Method B conditioning in ISO 7389? When should I pick each?

A3: ‑ Method A: 28‑day curing under standard laboratory climate: 23±2 °C, 50±5 % RH, basic curing for routine performance evaluation.

‑ Method B: First complete Method‑A curing, then run three cycles of hot‑oven (70 °C) and distilled‑water immersion to simulate heat‑moisture exposure; finish with 24 h stabilisation under standard environment before testing. Note: Method B is for simulated environmental pre‑treatment, not a full‑service‑life durability test. Select conditioning method per project specification or product standard requirements, and document the chosen method in your final test report.

Q4: What elongation levels are specified in ISO 7389 for 12 mm original joint width? Can I test other elongation values?

A4: Standard elongation settings are 25 % (15.0 mm), 60 % (19.2 mm), 100 % (24.0 mm) for 12 mm sealant bead width. Parties may agree and apply other custom elongation percentages for special‑purpose testing; you must record custom elongation in the test report.

Q5: Which substrates can be used for ISO 7389 specimens?

A5: Default substrates: mortar, anodized aluminium or glass (defined in ISO 13640). Alternative substrates are permitted upon mutual written agreement between testing parties, but sealant bead dimension and adhesion contact area must keep identical to standard drawingsISO.

Q6: What common mistakes cause unreliable ISO 7389 test results?

A6: ‑ Air bubbles trapped inside sealant bead during specimen casting; ‑ Wrong stretching speed, non‑compliant holding‑time or recovery waiting‑time; ‑ Placing specimen flat instead of vertical on high‑friction surface after releasing elongation; ‑ Forgetting to document conditioning method, elongation percentage and substrate type on test report; ‑ Spacers with incorrect dimension for target elongation.

Q7: Can regular universal tensile machine run ISO 7389 test?

A7: A universal tensile tester can perform the stretching step (5.5±0.7 mm/min extension rate). However ISO 7389 also requires matched test fixtures, standard‑size spacers for 25 %/60 %/100 % elongation, low‑friction test platform, 0.1‑mm‑precision vernier caliper and climate‑controlled conditioning chamber. Custom‑configured sealant extension test equipment (such as UnitedTest ISO 7389 sealant elastic‑recovery tester) integrates all required accessories to reduce manual‑operation error and improve repeatability.

Q8: Why choose ISO 7389 Sealant Elastic Recovery Test Machine | UnitedTest Manufacturer?

A8: UnitedTest is professional manufacturer for ISO 7389:2002 sealant elastic recovery test machine. Our sealant extension tester measures elastic recovery of building joint sealants after maintained extension, fully compliant with ISO 7389, EN ISO 7389 for construction‑material lab QC and certification testing.

UnitedTest supplies full‑solution ISO 7389:2002 sealant elastic‑recovery test machine, the essential laboratory apparatus for determining elastic recovery performance of building‑construction joint sealants after maintained tensile extension.

Complying strictly with ISO 7389:2002 and EN ISO 7389 standards, our sealant extension testing system performs standard stretching speed of 5.5 ± 0.7 mm/min, and is equipped with complete sets of standard spacers for 25 %, 60 %, 100 % elongation, matched specimen fixtures and low‑friction recovery platform for sealant bead specimens.

This test equipment is widely used for silicone sealant, polyurethane sealant, MS‑modified‑silane sealant, polysulphide sealant and acrylic mastic sealant testing. It supports formula R‑D, incoming raw‑material inspection, factory quality control and third‑party laboratory certification test required by ISO 11600 building sealant product specifications.

Compared with retrofitted general universal tensile testers, UnitedTest dedicated ISO 7389 sealant elastic‑recovery tester integrates all standard accessories specified by ISO 7389, minimises human‑operational deviation, improves test repeatability, and helps your lab generate valid, audit‑ready test reports.

Our machine works together with supporting sealant‑test hardware including ISO 13640 standard test substrates, convection oven for Method‑B heat‑water accelerated conditioning and high‑precision vernier inside caliper. Custom fixtures and software functions are available upon request for special‑project test requirements.

Whether you run sealant‑manufacturer in‑house QC lab or independent third‑party testing institute, UnitedTest delivers reliable ISO 7389 sealant elastic‑recovery test machine and one‑stop sealant‑material mechanical‑testing solutions.

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