ASTM D624 Rubber & Elastomer Tear Strength Test | Tear Strength Test

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Material strength is a course that most engineering fields are required to study in university education. This interesting course is very practical and makes use of testing equipment in the materials laboratory.

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.

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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.

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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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ASTM D624 Tear Strength Tester for Vulcanized Rubber & TPE | UnitedTest

ASTM D624 standard test method measures tear strength of vulcanized rubber and thermoplastic elastomers, evaluating crack initiation and propagation using 5 specimen types. UnitedTest manufactures ASTM D624 compliant tear testing machines for elastomer material testing and quality control.

ASTM D624‑00(R2020) sets out laboratory test procedures for determining tear strength of conventional vulcanized rubber and thermoplastic elastomers (TPE). Tear strength describes a material’s resistance to crack initiation and crack propagation under tensile loading. Tear failures start at stress-concentrated locations including pre-made cuts, notches and inherent material defects. This standard specifies five distinct specimen geometries: Type A, B, C, T, and CP. Test results from different specimen types cannot be interchanged, since each shape generates unique stress conditions during testing.

This standard is widely used in elastomer research, incoming material inspection, production quality control and product certification for rubber seals, hoses, flexible polymer parts. UnitedTest develops and manufactures high precision ASTM D624 tear strength testing equipment, offering reliable force reading and consistent test performance for polymer laboratories and rubber manufacturing plants.

Test Principle

A tearing strain (and stress) is applied to a specimen by a tensile testing machine driven without interruption at a constant rate of crosshead (jaw) traverse until the specimen is completely torn. Depending on geometry, the measured quantity is either:

the maximum force to rupture/initiate a tear (Types A, B, C), or
the mean/median force to propagate a tear along a defined path (Types T, CP),

divided by the specimen thickness. The result is a relative resistance-to-tear number valid only for that geometry, speed, temperature and grain orientation.

Test Mehods:

Specimen Type	Geometry & Purpose	Measured property
Type A	Nicked crescent specimen (Die A), pre‑cut razor nick. Used when sample size is limited.	Tear propagation; maximum force to grow the pre‑existing nick, divided by specimen thickness
Type B	Nicked crescent with tab‑ends (Die B, aligned with ISO 34 configuration), razor nick. Preferred over Type A if sample permits.	Tear propagation from controlled pre‑nick; widely used quality‑control geometry
Type C	Un‑nicked right‑angle 90° specimen (Die C), no pre‑cut nick at apex.	Tear initiation strength at sharp stress‑concentrated 90° corner; if rupture does not start at apex, output approximates tensile strength instead of tear strength
Type T (Trouser tear)	Rectangular strip with a central pre‑cut slit, two parallel legs.	Steady‑state tear propagation parallel to specimen length; generates saw‑tooth force‑displacement curves
Type CP (Constrained‑Path tear)	Modified trouser specimen with internal fabric reinforcement and moulded tear groove.	Controlled‑path tear propagation; eliminates leg‑elongation interference that troubles Type‑T trouser tests; suitable for heavy‑duty rubber compounds

Test Specimen Info

Die A	Value	Die B	Value	Die C	Value
A	7.6 ±0.05	A	110 ±0.50	A	102 ±0.50
B	42 ±0.50	B	68 ±0.50	B	19 ±0.05
C	8.6 ±0.05	C	45 ±0.05	C	19 ±0.05
D	29 ±0.05	D	25 ±0.05	D	12.7 ±0.05
E	43.2 ±0.05	E	43 ±0.05	E	25 ±0.05
F	12.7 ±0.05	F	12.5 ±0.05	F	27 ±0.05
G	10.2 ±0.05	G	10.2 ±0.05	G	28 ±0.05
—	—	H	9 ±0.05	H	51 ±0.25
—	—	J	7.5 ±0.05	—	—
Nick	0.50 ±0.05	Nick	0.50 ±0.05	(no nick)	—

Type T (trouser): rectangular strip, nominally 100 mm long × 15 mm wide at ~2 mm thickness, with an initial cut of 40 ± 5 mm; the last ~1 mm of the cut must be made in a single stroke.

Type CP: molded piece 125 mm long (A) × 28.5 mm wide (B), nominal thickness 5 mm; groove cross-section C = 5.33 mm, D = 1.77 mm, E = 0.75 mm; fabric at mid-plane; initial cut 60 ± 5 mm; torn-section thickness ≈ 1.70–1.80 mm

Sample quantity: Minimum 3 replicates per condition.

Type C Sample

ASTM D624 Rubber & Elastomer Tear Strength Test Required Testing Machine

Universal Tensile Testing Machine	Complies with ASTM D412. Force reading accuracy within ±2 % of full‑scale range. - For Type A / B / C: cross‑head speed 500 ± 50 mm/min. - For Type T / CP: cross‑head speed 50 ± 5 mm/min. Low‑inertia force transducer is mandatory, pendulum dynamometers are not preferred due to inertial and friction artefacts.
Pneumatic or automatic tightening grips	Uniform clamping pressure to prevent specimen slippage; specimens must be axially aligned.
Specimen Cutting Press and dies	Sharp hardened steel dies matching Type A/B/C/T profiles. Inner surfaces near cutting edges must be polished ≥ 5 mm from edge, free of nicks. Die‑C 90° apex must be sharply ground. Dies require periodic dimensional verification with written records.
Nicking device	For Type A / B specimens, holds sample rigid and cuts a clean perpendicular nick with razor blade; blade may be lubricated with water‑soap solution.
Ancillary	Thickness micrometer per ASTM D3767; microscope ≥10× with graduated reticle for nick-depth and torn-thickness checks; strip chart / data acquisition; planimeter or electronic integration for total-work analysis; temperature chamber per D412 for non-ambient testing (ASTM D1349 temperatures).

Key Fixed Test Parameters

Cross‑head speeds:

- Type A, B, C: 500 ± 50 mm/min

- Type T, CP: 50 ± 5 mm/min

Detail ASTM D624 Rubber & Elastomer Tear Strength Test Procedure:

Mount specimen symmetrically inside machine grips, ensure axial alignment and adequate clamping depth to avoid slippage. For Type‑T trouser specimens, mount legs as per standard drawing.
Start tensile machine at specified constant cross‑head speed.
Stretch until full rupture of the specimen.
For Type‑A/B/C: record maximum tearing force.
For Type‑T /‑CP: continuously record full force‑displacement trace throughout tearing process.
Process recorded data:

A/B/C: use peak maximum force for computation.
T / CP: select analysis method (peak‑only, valley‑only, mean‑of‑peak‑valley, total‑work‑area or manual median curve analysis) to get representative tearing force F. Discard outlier peaks or valleys deviating > 20 % from preliminary mean.

Compute tear strength T_s=F/d. Take median across valid replicates as final test result.
Compile full test report as specified in clause 12 of ASTM D624.

Report content includes: specimen type, sample origin (die‑cut/moulded/from finished goods), nick depth, grain orientation, specimen thickness, force values, test temperature/humidity, testing‑machine type, vulcanization date and test date, and which trace‑analysis method was used for T‑ or CP‑type specimens.

Industrial Application Fields

Tires — the dominant use case: tread compound chip-and-chunk, cut growth, sidewall tearing. Appendix X1.3 shows CP tear strength at 100 °C correlating directly with the cutting–chipping rating of off-road tire compounds (the clearest documented case of tear data predicting service performance).
Automotive — seals, weatherstrips, hoses, belts, bushings, mounts, air-spring and CVJ boots (tear often originates at molding flash, trim nicks or ozone cracks).
Industrial rubber — conveyor belts, hoses, gaskets, rollers, membranes, linings, vibration isolators.
Footwear and consumer goods — soles, sporting goods, molded articles.
Medical and pharmaceutical — stoppers, septa, tubing, elastomeric closures (tear/coring resistance).
TPE and polymer compounding — grade qualification, formulation screening (filler type/loading, cure system, oil/plasticizer level, blending, antidegradants), supplier certification, incoming QC, specification compliance, and failure analysis.

Related Test Standard:

ASTM D624	Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers
JIS K 6252-1	Rubber, vulcanized or thermoplastic -- Determination of tear strength -- Part 1: Trouser, angle and crescent test pieces
GB/T 529	Rubber,vulcanized or thermoplastic - Determination of tear strength（Trouser，angle and crescent test pieces）
ISO 34-1	Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 1: Trouser, angle and crescent test pieces
ISO 34-2	Rubber, vulcanized or thermoplastic. Determination of tear strength. Small (Delft) test pieces
ISO 6133	Multi-peak ("knotty tear") trace analysis — required for Method A (trouser) to extract the median tearing force from oscillating traces

Important differences

Aspect	ASTM D624	ISO 34-1 / GB/T 529 / JIS K6252
Nick depth (crescent/angle)	0.50 ± 0.05 mm	1.0 ± 0.2 mm
Trouser speed	50 ± 5 mm/min	100 ± 10 mm/min
Angle/crescent speed	500 ± 50 mm/min	500 ± 50 mm/min (JIS 500 ± 25)
Median force analysis	Defined inside D624 §11	Per ISO 6133
Extra types	Type A (small crescent) and Type CP (constrained path) have no ISO counterpart	Methods A/B/C only
Crescent die length	Die C = 102 mm	~110–115 mm

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WDW Series Computer Control Electronic Universal Testing Machine made by UNITEDTEST range from 100N to 600KN load capacity with various models like single columns, table type, door frame type etc., is used to perform tension, compression, flexure/bending, shearing, peeling etc., test for metal and nonmetal specimens.

Tear fixture ISO 505, ASTM D1004, vise grip or self-tightening roller grips are the most popular for this application and the least expensive. They can be provided with a rubber faced surface to measure the tear resistance strength of flexible plastic film and sheeting.

Electric sample punching machine is a sample preparation device designed based on the punching principle, specifically developed for preparing standard samples of sheet-like, film-like, and thin plate materials.

T-Peel Resistance Test Fixture for Adhesives is based on ASTM D1876 standard, used to measure the adhesion strength of adhesive maeterial. ASTM D1876 peel strength test method is commonly used to measure the strength of adhesive bonds between two sealed materials.

Webbing test fixture used for tensile testing of the webbing, belt test sample, determine the webbing, belt tensile strength, elongation etc., Webbing is a strong fabric woven as a flat strip or tube of varying width and fibres often used in place of rope.

Q1: What is ASTM D624 test used for, and why is it important for rubber / TPE materials?

A: ASTM D624 measures tear strength, the material’s resistance to crack initiation and crack propagation for vulcanized rubber and thermoplastic elastomers. Many real‑world rubber component failures originate from small scratches, nicks or defects (not simple tensile breakage). This test gives comparative lab data for compound development, incoming‑material QC, batch release and product qualification. It differentiates two key failure modes: tear initiation (Type‑C) and tear propagation (Type A/B/T/CP). Note: lab tear strength results cannot directly predict end‑service lifetime; practical performance must be validated per‑application.

Q2: What are the 5 specimen types in ASTM D624 and how do I select which one to use?

A: Type A: Nicked crescent specimen; tear propagation test for limited‑size samples.

Type B: Nicked crescent with tab‑ends (ISO‑34 compatible); preferred for tear‑propagation if sample size permits.

Type C: Un‑nicked 90° angle specimen; measures tear initiation at sharp apex; widely used for QC.

Type T (Trouser tear): Two‑leg slit specimen; measures steady‑state tear propagation. Requires low‑inertia force recording.

Type CP (Constrained‑Path): Reinforced moulded trouser‑variant; prevents leg‑elongation distortion, delivers stable tear‑propagation data, correlates well with off‑road tire cut‑chip performance.

Critical rule: Results cannot be cross‑correlated between different specimen types — each geometry creates different stress‑state conditions. Always follow drawing / customer specification for specimen selection.

Q3: What are the correct test speeds (cross‑head rates) for ASTM D624?

A: Type A / B / C: 500 ± 50 mm/min

Type T / CP (trouser‑style): 50 ± 5 mm/min

Wrong test speed will produce biased tear‑strength numbers. For Type‑T / CP tests, low‑inertia electronic force transducer is mandatory; pendulum‑style dynamometers produce unreliable data due to friction and inertial lag effects.

Q4: What is the difference between tear initiation vs tear propagation in D624?

A: Tear initiation (Type‑C specimen): Measures force required to start a crack from a sharp 90‑degree corner (no pre‑made nick). If rupture starts somewhere other than the apex, the output reflects tensile strength, not true tear strength.

Tear propagation (Type A/B/T/CP): Measures force needed to drive an existing pre‑cut nick / slit to keep growing across the sample. Rubber often shows different values for initiation vs propagation; both may be relevant depending on end‑use conditions.

Q5: What is knotty tear vs smooth tear for Type‑T / CP trouser specimens?

A: Knotty tear (Curve‑a): Saw‑tooth force trace with large peaks and sharp force drops. Stress builds up then sudden catastrophic crack advance. Analysis methods include peak‑only, valley‑only, mean peak‑valley, total‑work‑area.

Smooth tear (Curve‑b): Force fluctuates in narrow band, tear propagates continuously. Use median or weighted‑average force analysis.

Q6: Why do my tear‑strength results show high scatter / big variation between replicates?

A: Tear testing is inherently high‑variability measurement, similar to fatigue testing. Major root causes include:

Poor‑quality cutting die (blunt edge, burrs on specimen edge creating artificial stress risers).

Inconsistent nick‑depth for Type‑A/B specimens (nick depth must be 0.50 ± 0.05 mm; verify with ≥10× microscope).

Ignoring rubber grain / flow anisotropy; tear resistance changes with grain direction.

Specimen slippage inside grips, or mis‑aligned mounting.

Violating conditioning and timing rules after nicking.

Using pendulum‑type force sensor for Type‑T / CP trouser test.

Check each item for troubleshooting; document grain orientation and nick depth in test reports.

Q7: Can I use one universal tester for both ASTM D412 tensile test and ASTM D624 tear test?

A: Yes. The same UTM frame can handle both standards, but you must switch test fixtures, test dies, cross‑head speed parameters and analysis method. D624 requires dedicated tear‑specimen cutting dies, nicking tool, and for trouser‑type samples, continuous force trace capture capability.

Q8. Why is tear testing important for rubber and TPE?

A: Because rubber parts rarely fail by clean tensile overload. In service they fail when a nick, cut, inclusion, molding flash line, ozone crack or sharp radius concentrates stress and a crack runs. D624 quantifies how much load a flawed specimen can carry before the flaw propagates. It is one of the few rubber lab tests with a documented field correlation: Appendix X1.3 of the standard shows constrained-path (CP) tear strength at 100 °C correlating with the cutting–chipping rating of off-road tire compounds. That is why tire, belt, hose, seal and medical-elastomer specifications routinely carry minimum tear-strength requirements.

Q9. Can I compare or convert results between Type A, B, C, T and CP?

A: No. Section 4.3 states that no correlation between types should be expected, because each measures tear strength for a different geometry. Always fix one type for a specification and never cross-convert.

Q10. What machine features matter most for D624?

A: Wide, stepless speed range covering 50 and 500 mm/min; excellent low-speed smoothness; a low-inertia electronic load cell; self-tightening or pneumatic grips that increase pressure as tension rises (to prevent slip); enough crosshead travel to tear a trouser leg completely; continuous high-rate data acquisition for the saw-toothed T/CP curve; and software that can do peak, valley, mean, and area-under-curve (total work) analysis plus median-of-N statistics.

Q11: Why choose ASTM D624 Tear Strength Testing Machine for Rubber and Thermoplastic Elastomers from UnitedTest?

A: UnitedTest manufactures ASTM D624 tear strength testing machines for vulcanized rubber and thermoplastic elastomers. Complete solution: universal tensile testers, tear cutting dies, nicking fixtures, pneumatic grips for Type A, B, C, T, CP tear specimens. Compliant with ASTM D624‑00(R2020) & ISO 34‑1 for rubber tear‑resistance QC, R&D and material qualification.

ASTM D624 is the primary North‑American standard for measuring tear‑initiation and tear‑propagation resistance of vulcanized rubber and thermoplastic elastomer (TPE) materials. Rubber products including tires, seals, gaskets, hoses, footwear elastomer parts frequently fail in‑service from crack growth starting at small surface nicks and defects. Reliable ASTM D624 tear‑strength testing is essential for rubber compound R&D, incoming‑material inspection, production quality‑control and product performance validation.

UnitedTest, professional materials‑testing‑equipment manufacturer, supplies fully‑compliant ASTM D624 tear‑strength testing systems built on our high‑precision electronic universal tensile test platform. Our complete D624 solution includes main test frame, interchangeable tear‑specimen cutting dies (Type A, B, C, T), constrained‑path CP‑test accessories, controlled nicking device, pneumatic anti‑slip grips, micrometer sets and dedicated test analysis software.

Our test machines support both test speeds specified in ASTM D624: 500 ± 50 mm/min for Type A/B/C specimens and 50 ± 5 mm/min for Type‑T trouser and Type‑CP constrained‑path tear tests. Equipped with low‑inertia electronic force transducers, our system captures continuous force‑jaw‑separation traces for accurate analysis of knotty‑tear and smooth‑tear curves. Software automatically calculates tear‑strength value T_s=F/d, supports peak‑only, valley‑only, mean‑force and total‑work‑area analysis, exports standardized test reports following ASTM D624 reporting requirements.

UnitedTest ASTM D624 test set‑ups can also perform ISO 34‑1 tear‑strength testing, ASTM D412 rubber tensile‑elongation test, for one‑machine multi‑standard laboratory efficiency. Our equipment serves rubber factories, TPE compounders, automotive component suppliers, tire manufacturers, defence‑industry labs, third‑party testing institutes worldwide.

Looking for ASTM D624 tear strength tester, tear specimen cutting dies or custom tear‑test fixtures? Contact UnitedTest for quotation and technical support.

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