ASTM D2208 Leather Breaking Strength Testing by Grab Method | UnitedTest Universal Testing Machines

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ASTM D2208 Leather Breaking Strength Grab Method Tester | UnitedTest

ASTM D2208 describes grab‑type tensile testing for leather breaking strength and elongation‑at‑rupture, ideal for soft, sueded and embossed leathers unsuitable for ASTM D2209 strip tensile test. UnitedTest supplies ASTM D2208 compliant leather grab tensile testing machines for leather laboratories and quality control.

ASTM D2208 Standard Test Method for Breaking Strength of Leather by the Grab Method

ASTM D2208 specifies a grab‑type tensile test to measure breaking strength and elongation‑at‑rupture for certain leather types where the conventional strip‑tensile method (ASTM D2209) cannot produce accurate results. This grab‑based testing procedure is widely adopted for light soft leathers, sueded, boarded and embossed leathers, as well as narrow straps, welt and lace materials, delivering reliable mechanical performance data for footwear, upholstery and leather product quality assessment. UnitedTest manufactures fully ASTM D2208‑compliant leather grab tensile testing equipment, supporting material R&D, incoming inspection and finished‑product verification for leather manufacturers and third‑party test laboratories.

Test Principle:

A leather specimen is clamped in the jaws of a tensile testing machine. Constant‑rate tensile force is applied until the specimen ruptures. The maximum rupture load is recorded as breaking strength; percent elongation at break is measured simultaneously following ASTM D2211. The grab‑style jaw clamps only a partial area of the specimen, which avoids edge‑cutting artefacts for soft, thin, or narrow leather materials.

Specific Test Method

Grab method: The leather specimen is clamped across part of its width (not the full width as in a strip method) in a tensile testing machine.

Force is applied until rupture at a specified jaw separation speed.

Breaking load and percent elongation at rupture are recorded.

Applicable to both specimens wider than the jaws and narrow strips/belts/laces.

Test Specimen Information

Two categories of specimens are defined:

1. Wide‑flat leather specimens: Rectangular pieces, 6 in (152 mm) long × 3 in (76 mm) wide. Record the orientation relative to the hide backbone;

2. Narrow‑strip specimens (strap, welt, lace, round‑belt leather): Cut to 6 in (152 mm) in length, no fixed width requirement for narrow finished goods;

Thickness/diameter shall be measured at three positions: specimen centre and 1 in (25.4 mm) on each side of centre, accurate to 0.001 in (0.025 mm).

Test Equipment of ASTM D2208 Leather Breaking Strength Testing by Grab Method:

Tensile testing machine:

Constant‑rate‑of‑extension tensile tester (load‑cell or pendulum type acceptable) as described in ASTM D2209.

Clamp Fixtures

One jaw face: 1 in. × 1 in. (25.4 × 25.4 mm)

Other jaw face: 1 in. × ½ in. (25.4 × 38 mm) or larger (for specimens wider than jaws)

Thickness gauge

Dead‑mass type per ASTM D1813, readable to 0.001 in. (0.025 mm)

Key Test Parameters and stipulations:

- Initial grip separation (gauge length): 3 in ± 1/8 in (76 mm ± 3.2 mm).

- Cross‑head travel speed: 10 in/min ± 2 in/min (254 mm/min ± 50 mm/min) under free‑running condition;

- Upper load limit recommendation: Not for loads exceeding 500 lbf (2200 N), to prevent jaw slippage.

- Pre‑test conditioning: Condition samples according to ASTM D1610 practice before testing.

- Rupture may occur directly at jaw grips; results shall still be recorded regardless of rupture location.

Test Procedures of ASTM D2208 Leather Breaking Strength Testing by Grab Method

For specimens wider than jaws

1. Condition specimens following ASTM D1610.

2. Measure thickness at three specified points.

3. Set initial grip distance to 3 in ± 1/8 in.

4. Align specimen long axis parallel to pull direction, lay flat and evenly distribute material before firm clamping.

5. Operate tester at 10 in/min ± 2 in/min cross‑head speed.

6. Record rupture load as breaking strength; determine elongation according to ASTM D2211.

For narrow‑strip specimens

1. Complete conditioning and three‑point thickness/diameter measurement.

2. Mount specimen with long‑axis aligned to tension direction, set initial grip gap to 3 in ± 1/8 in.

3. Run test at specified cross‑head speed until rupture.

4. Record breaking strength and test elongation per ASTM D2211.

Industry / Application Fields

ASTM D2208 targets light‑weight, soft leathers, boarded, sueded, embossed leathers, plus narrow finished leather components: straps, welting, laces, round belts. Typical industries include footwear, leather apparel, upholstery, leather accessory and belt manufacturing. It is used for incoming‑goods quality inspection, product specification verification, material development and batch‑to‑batch quality control for items that cannot be reliably evaluated via ASTM D2209 strip‑tensile testing.

ASTM D2208 Leather Breaking Strength Testing by Grab Method

Related & Similar Standards

ISO 3376	Leather — Determination of tensile strength and elongation
GB/T 46469	Leather—Physical and mechanical tests—Determination of tensile strength and percentage elongation
ASTM D2209	Standard Test Method for Tensile Strength of Leather
ASTM D2208	Standard Test Method for Breaking Strength of Leather by the Grab Method
ASTM D2211	Elongation of Leather (used for elongation measurement)
SATRA TM 43	Tensile strength and extension at break of leather
ISO 3377-1	Leather - Physical and mechanical tests - Determination of tear load - Part 1: Single edge tear
ISO 3378	Leather - Physical and mechanical tests - Determination of resistance to grain cracking and grain crack index

Importance of This Test for Leather Material

Breaking‑strength performance directly reflects leather quality, tanning effect and expected service life.

1. It assesses whether leather can withstand real‑world tension loads in end‑products such as shoe straps, clothing leather, upholstery and belts, avoiding premature tearing and product failure during usage.

2. Many soft, thin, suede‑finished or narrow leather parts cannot be accurately tested by conventional strip‑tensile methods. The grab method provides representative mechanical‑property data for these special‑grade leathers.

3. Standardised test data supports supplier‑buyer specification agreements, quality‑batch comparison, material formulation improvement and failure‑root‑cause analysis in leather production.

4. Repeatability and reproducibility rules allow laboratories to validate whether test data is credible for quality‑acceptance decisions

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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.

Snubbing and Capstan grips are all engineered to perform high strength tensile tests where the test samples are long compared to their cross-sectional area, such as wire, rope and strapping.

Q1: What is ASTM D2208 test?

A1: ASTM D2208 is an ASTM standard grab‑method test to measure breaking strength and rupture elongation for leather. It clamps only part of the test specimen with special jaws and pulls at constant speed until leather breaks, recording rupture load and elongation percentage.

Q2: Why is ASTM D2208 important for leather manufacturers & labs?

A2: It verifies leather durability and real‑world service performance. Light‑soft leather, suede, narrow straps, welting, laces and round belts cannot get reliable results from ASTM D2209 strip‑tensile testing. Test data supports incoming material inspection, supplier‑buyer specification agreement, quality batch comparison, and prevents premature tearing failures for footwear, apparel, upholstery and leather accessories.

Q3: What leather types are suitable for ASTM D2208? What material cannot be tested?

A3: Suitable: light soft leather, boarded, sueded, embossed leather, narrow strap, welt, lace, round‑belt leather.

Not applicable: wet‑blue leather. Not recommended for breaking load over 500 lbf (2200 N), due to high risk of specimen slipping inside jaws.

Q4: What is the difference between ASTM D2208 (grab method) and ASTM D2209 (strip method)?

A4: ASTM D2209 uses narrow cut strip specimens, best for firm, heavy leather. ASTM D2208 uses grab jaws, designed for soft, thin, suede or narrow finished leather parts where cutting narrow strips will damage sample edges and create biased test results, D2208 measures breaking strength; D2209 calculates tensile strength based on cross‑section area.

Q5: My leather breaks right at jaw grips, is this test data valid?

A5: Yes. The standard explicitly states you shall record the breaking load regardless of where rupture occurs, even if fracture takes place at jaw clamping area.

Q6: Why does specimen slippage happen during ASTM D2208 grab test? How to reduce slipping?

A6: Slippage commonly occurs for high‑strength leather over 500 lbf load range, or worn jaw faces, improper clamping pressure, misaligned specimen mounting. Solutions: use standard‑size matched jaws, clean jaw surfaces, evenly lay flat sample before final clamping, avoid over‑tightening which crushes leather edges. If loads consistently exceed 2200 N, switch to ASTM D2209 strip‑method test instead.

Q7. Why the 500 lbf / 2200 N limit?

A7: Because at higher loads the leather tends to slip in the jaws under grab clamping, giving low/erratic readings. For stronger leather, use D2209 or another suitable method.

Q8. Is elongation measured in D2208?

A8: Yes. Elongation at rupture is determined using ASTM D2211 during the same pull.

Q9. What industries use ASTM D2208?

A9: Footwear (uppers, laces, welts), garment and glove leather, furniture/automotive upholstery, belt and strap manufacturing, and leather QC labs.

Q10. Why does rupture often occur at the jaws?

A10: That is normal for the grab method. The standard requires recording the load anyway, regardless of where the specimen breaks.

Q11: Why recommend to use UnitedTest ASTM D2208 Breaking Strength of Leather by the Grab method Tensile testing machine?

A11: UnitedTest supplies ASTM D2208‑16 (Reapproved 2023) leather breaking strength grab test machines. Compliant with ASTM D2208 grab‑method standard for soft leather, suede, straps, welting & laces. Complete jaws, thickness gauge, full test report output for leather labs & manufacturers.

UnitedTest manufactures full‑compliance universal tensile testing machines for ASTM D2208‑16 (Reapproved 2023): Standard Test Method for Breaking Strength of Leather by the Grab Method.

ASTM D2208 grab test is the essential physical test for light soft leather, sueded, embossed leather, narrow straps, welting, laces and round‑belt leather that cannot be accurately evaluated by ASTM D2209 strip‑tensile testing. This standard measures leather breaking strength and percent elongation‑at‑rupture to validate material durability for footwear, leather apparel, furniture upholstery and leather accessory production.

Our ASTM D2208 leather grab test machine is fully configured with standard‑specified grab jaw sets (1 in × 1 in / 1 in × 1.5 in jaw faces), supporting 3‑inch gauge‑length setup, cross‑head speed 10 in/min ± 2 in/min, and synchronised elongation measurement complying with ASTM D2211. Matching dead‑mass thickness gauge and steel scale accessories are optional for full‑standard laboratory set‑ups.

UnitedTest test systems help leather factories, third‑party testing laboratories and tanneries run repeatable ASTM D2208 tests: record breaking‑strength load, specimen thickness, generate structured test reports matching ASTM D2208 reporting requirements. Our machine solves common pain points including specimen slippage, inconsistent clamping and non‑standard speed control during leather grab‑strength testing.

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