ASTM D5034 Complete Guide: Fabric Grab Test Procedure, Jaw Faces, Grips, Machines and Calculations
ASTM D5034 is the grab test for textile fabrics: a 100 mm wide specimen is clamped only across its centre 25 mm and pulled to rupture. It looks simple, which is why it is so often run wrong. A front jaw face turned sideways, a specimen mounted off-centre, five filling specimens instead of eight, or a wet specimen left on the bench for five minutes will each move the result, and none of them shows on the force trace. This complete guide covers grab vs. modified grab, specimen size and the 37 mm centring line, the jaw-face rule, conditioning and wet testing, speed and load cell, which testing machine to use (a Mark-10 tester or a Galdabini universal testing machine), grips, what "apparent elongation" means and when an extensometer helps, worked calculations, jaw-break rules, precision, D5034 vs. D5035 and ISO 13934-2, and a full FAQ, with videos from our lab.
For the standard reference page, see our ASTM D5034 grab test page. This article focuses on how to set up and run the test and which equipment to choose. If your specification calls for a strip test, read the companion ASTM D5035 strip tensile test complete guide.
ASTM D5034 at a glance
Full title: Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test). Current edition D5034-21, reapproved 2025.
Results: breaking strength (maximum force, N or lbf) and apparent elongation (% of the 75 mm gauge).
Procedures: grab (G) and modified grab (MG), with a machine letter: E (CRE), L (CRL) or T (CRT). G-E is the most common.
Specimen: 100 ± 1 mm (4 in) wide, at least 150 mm (6 in) long, cut (never raveled), with a line 37 ± 1 mm from one long edge.
Front jaw face: 25 ± 1 mm across the specimen, 25 to 50 mm along the load. Back face: at least as large as the front.
Gauge length: 75 ± 1 mm (3 in). Speed: 300 ± 10 mm/min (12 in/min) on CRE, or a 20 ± 3 s time to break on CRT.
Specimens: 5 warp and 8 filling per laboratory sample, for each condition (conditioned or wet).
Force range: every break between 10 % and 90 % of full scale. Conditioning: ASTM D1776 textile atmosphere.
Typical equipment: a CRE frame with a 1 to 5 kN range, and pneumatic or vise grips with grab faces.
What ASTM D5034 measures and who uses it
The grab test measures fabric strength the way fabric is usually loaded in use, at a seam, strap attachment or clamp, rather than across its full width. Only the central band of yarns is clamped, but the crossing yarns lock the neighbouring yarns into the structure, so they share part of the load. The standard calls the result the effective strength of the fabric in use, including the assistance of adjacent yarns.
That one feature explains the method. It is why grab results are higher than strip results, why the result is a force and never a force per width, why centring matters, and why a modified grab exists. Note the title: D5034 reports breaking strength, its companion ASTM D5035 breaking force; both are forces, but a grab value is not the force for any defined width.
D5034 is accepted for commercial acceptance testing of most woven and nonwoven fabrics, and appears in apparel, workwear, upholstery, protective clothing, tent, luggage, filter and medical-nonwoven specifications. Labs that run it usually also run tear tests to ASTM D2261 and ASTM D5587; see our textile testing overview and textiles page.
Not for knits or stretch fabrics with more than 11 % stretch; use ball burst (ASTM D3787, D6797) or an elastic-fabric method.
Not for glass fabrics (ASTM D579 and D580), geotextiles (ASTM D4632) or, where specified, coated fabrics (ASTM D751).
Very strong fabrics above about 200 N per cm of width (about 114 lbf/in) may need a pin-wrap technique.
Grab vs. modified grab
Grab (G): the 100 mm specimen is left whole; the unclamped yarns on each side help carry the load. For woven, nonwoven and felted fabrics.
Modified grab (MG): slits are cut in from both long edges at mid-length, at right angles to the tested yarns, severing every tested yarn except the central 25 ± 1 mm. The ends stay full width, but neighbouring yarns can no longer help.
MG is used mainly for wovens, especially high-strength fabrics where a raveled strip keeps unravelling; such specimens may be at least 400 mm (16 in) long so they can be wrapped around pins. MG reads lower than G on the same fabric. If a specification just says "grab strength per D5034", it means G on a CRE machine.
ASTM D5034 specimens: size, the 37 mm line and minimum length
Cut each specimen 100 ± 1 mm (4 in) wide and at least 150 mm (6 in) long, long side parallel to the yarns being tested: along the warp for warp-direction specimens, across it for filling. Grab specimens are always cut; raveling belongs to the D5035 strip test.
Why the line is drawn 37 mm from the edge
Draw a line 37 ± 1 mm (1.5 in) from one long edge, along a yarn, and put the edge of the front jaw face on it when mounting. That leaves 37 mm of fabric on one side, 25 mm under the face and 38 mm on the other: 100 mm. Every specimen is centred, with the same number of assisting yarns on each side, without measuring at the machine. Mount 10 mm off-centre and the specimen tears from the short side and reads low.
Minimum length: L = 95 + 2W
A note in the standard sets the minimum length at L = 95 + 2W mm, where W is the jaw-face length along the load: the 75 mm gauge plus at least 10 mm beyond each clamp.
25 mm long faces: 95 + 50 = 145 mm, so the 150 mm minimum governs.
50 mm long faces: 95 + 100 = 195 mm. A 100 × 200 mm specimen is a convenient size that suits either face.
Sampling and cutting
Space specimens along a diagonal of the laboratory sample so no two in one direction share tested yarns, and stay one-tenth of the fabric width from each selvage.
For paired conditioned and wet results, cut double-length specimens and divide them so both halves contain the same yarns.
The ± 1 mm width tolerance is tight for scissors. Use a template and rotary cutter, or a rectangular cutting die on an arbor press. We make hardened and ribbon steel dies and will make free test cuts on your fabric.
For MG, check under a pick glass that every tested yarn outside the 25 mm band is severed. One uncut yarn makes MG read like G.
Sampling, conditioning and wet testing
Take every roll or piece in lots of 1 to 3, four in lots of 4 to 24, five in lots of 25 to 50 and 10 % (maximum 10) above 50, and cut a full-width laboratory sample 1 m (1 yd) long from each. From each laboratory sample, test 5 warp and 8 filling specimens for each condition. Filling results scatter more; "3 + 3" and "5 + 5" plans do not meet the method.
Precondition fabric that is wetter than equilibrium, then condition it in the ASTM D1776 standard atmosphere for testing textiles, nominally 21 °C (70 °F) and 65 % RH; recent editions changed the tolerances, so use your current copy. Routine minimum times are 8 h for wool and viscose, 6 h for cotton, 4 h for acetate and 2 h for low-regain fibres, and you test in the same atmosphere.
Wet testing: soak in room-temperature water, routinely 1 h, with up to 0.05 % nonionic wetting agent if needed.
Two-minute rule: test each specimen within 2 minutes of removing it from the water. Have the method loaded and the jaws open first.
Desize first (ASTM D629) if unsized wet strength is needed, and state whether the optional wet-shrinkage allowance was applied.
ASTM D5034 test speed and machine requirements
The tester must conform to ASTM D76 and may be CRE, CRL or CRT. CRE is preferred, and every modern electromechanical tensile tester and universal testing machine is CRE. Results from different machine types are not comparable; in a dispute the referee condition is a 20 ± 3 s time to break, set on a CRE frame by adjusting speed on two or three spare specimens.
Speed and gauge: 300 ± 10 mm/min over 75 ± 1 mm (set with a gauge block), a nominal 400 % per minute. A fabric breaking at 28 % elongation reaches 21 mm in about 4 seconds.
Load range: every break between 10 % and 90 % of full scale. Apparel wovens typically grab-break at about 200 N to 1.2 kN; heavy, flame-resistant and coated fabrics at 2 to 5 kN. A 500 N fabric on a 5 kN cell sits right at the 10 % limit, so many labs keep a smaller cell for light fabrics.
Data rate: our advice is 50 to 100 points per second or more so a 4 second peak is captured.
System check: test standard fabrics at least weekly and after any change to the load cell or clamps, and chart the results.
Which testing machine for ASTM D5034: Mark-10 or Galdabini?
Both machine families we supply run D5034 at 300 mm/min. The choice depends on your highest break force, how many methods share the frame, and whether you need full method software and reports.
Mark-10 tensile testers: basic and QC grab testing
A Mark-10 motorized frame is the economical choice for incoming inspection and production QC against a minimum grab strength. F-series frames are CRE, hold speed to ±0.2 % and sample load at 5,000 Hz, and 300 mm/min (12 in/min) sits inside every model's standard speed range, so no speed option is needed.
500 lb (F505): about 2.2 kN with 18 in (457 mm) of travel and speeds to 330 mm/min; covers most apparel, sheeting and light nonwovens. The 300 lb (F305) suits lighter fabrics.
1,500 lb (F1505): about 6.7 kN with 32 in (813 mm) of travel and 10 to 600 mm/min, for workwear, canvas, upholstery and coated fabrics. The 750 lb (F755) sits between.
The 100 lb (F105), about 450 N, suits only light nonwovens; most woven grab tests exceed it.
To report apparent elongation, the frame must record crosshead travel with force. Our adapters fit our grips to Mark-10 frames. See Mark-10 test frame vs. universal testing machine and all models on the tensile testers page.
Galdabini universal testing machines: advanced textile labs
For certification labs, mills that send full force-extension data to customers, and labs that run D5034, D5035, D2261, D4632 and webbing tests on one frame, a Galdabini universal testing machine is the better fit:
5 kN: dual-column, 175 mm column clearance for wide pneumatic grips, the right capacity for nearly all grab tests.
10 kN: headroom for heavy coated fabrics and geotextile grab, plus plastics and adhesive work.
25 kN: for labs that also break webbing, straps and high-tenacity industrial fabrics.
2.5 kN Quasar: single column, up to 1,000 mm/min and 1 m stroke, for light fabrics, nonwovens and films.
Test software lets you save G-E, MG-E and the CRT referee set-up as separate methods, enforce 5 + 8 specimens, flag near-jaw breaks and report averages per direction and condition. See the universal testing machine buyer's guide.
Choose a Mark-10 for QC grab strength on known fabrics, a small footprint and a lower budget.
Choose a Galdabini UTM for method software and reports, several textile methods on one frame, CRT referee testing, heavy fabrics, video extensometry or chamber testing.
Jaw faces: what ASTM D5034 actually requires
This is the most misquoted part of the standard, and it matters more than the grip body. Faces must be smooth, flat, parallel, of metal or another agreed surface, with matching centres:
Front face: 25 ± 1 mm (1 in) across the specimen. This is the dimension that defines a grab test.
Front face: 25 to 50 mm (1 to 2 in) along the load.
Back face: at least as large as the front. Use the same sizes for every specimen and report them.
"1 × 1 in front, 1 × 2 in back" is often quoted as the requirement. It is a common commercial set-up that complies, and the larger back face helps alignment and reduces slippage, but a 25 × 25 mm back face, or a 25 × 50 mm front with an equal or larger back, also complies. Orientation matters: a 25 × 50 mm front face fitted sideways grips 50 mm of width, and the test is no longer a grab test. Mark quick-change inserts and check them at every change.
For the modified grab, the text we reviewed calls for a top face of 25 × 50 mm or larger (long side along the load) and a bottom face of 50 × 50 mm or larger; confirm in your current edition, and tell us if you run MG so we can confirm the face set.
Face surface and the carbon-paper check
Smooth metal is the default. If specimens slip, or more than 25 % break at the jaw, you may pad the jaws, coat the fabric under the clamp or change the face, and report it. Rubber-coated faces usually cure slick synthetics and coated fabrics; serrated faces for plastics and metals tend to cut yarns. To check clamping, close the faces on white tissue, two carbon papers back to back and white paper: the imprint should be complete and even.
Grips for ASTM D5034: pneumatic, vise and wrap-style
The faces decide whether you are running a grab test; the grip body decides whether you are running it repeatably, closing square with the same force as the fabric thins.
Pneumatic grips: the default
Pneumatic grips set clamping force by air pressure, so it is the same for all 13 specimens and every operator. They close fast, which helps with the two-minute wet rule, and a foot pedal frees both hands to align the 37 mm line. Our compact 2.4 kN centric and 2.6 kN pneumatic grips cover most apparel and light industrial grab tests; for heavier fabrics, tell us your highest break force and we will match the grip. Set pressure just high enough to stop slippage: too little lets the fabric creep and inflates elongation, too much crushes yarns and causes jaw breaks.
Vise grips with grab inserts
Manual vise grips suit lower volumes and fabrics that do not slip. Tighten the same way each time and watch the jaw-edge marks. Quick-change inserts let you swap smooth or rubber-coated faces without removing the grip body.
High-strength fabrics: pins and wrap grips
Above about 200 N/cm, flat jaws slip or cut the fabric. The standard describes two stainless-steel pins 10 mm (3/8 in) in diameter and 125 mm (5 in) long; the specimen wraps around them so friction takes most of the load before the clamp. Wrap grips and bollard grips, normally used for webbing, cord and rope, work on the same principle. Either way it is a reported modification, and because the fabric keeps stretching around the pin, crosshead elongation overstates the true value; measure elongation on wrapped specimens with a video extensometer. Contact us to discuss a pin-wrap fixture.
Grips to avoid
Wedge grips with serrated faces cut yarns at the jaw line; use them only with smooth or padded faces on very heavy constructions.
Roller grips are ideal for elastomers and films but do not give the flat 25 mm front face a grab test is defined by.
Our grips fit Instron, MTS, ZwickRoell, Shimadzu, Tinius Olsen and Mark-10 frames with grip adapters. See jaw breaks and specimen slippage and the tensile grip selection guide.
Elongation in D5034: crosshead vs. extensometer
D5034 reports apparent elongation: the extension from the start of the force-extension curve to the breaking force, as a percentage of the 75 mm gauge. It is measured as clamp separation, which means crosshead travel. You do not need an extensometer to comply with D5034. "Apparent" is deliberate: the fabric creeps slightly out of the jaws and the unclamped yarns deform differently from the clamped band, so the real deforming length is a little over 75 mm. Everyone measures it the same way, so results still compare.
Pretension: if elongation is measured, hang the 170 g (6 oz) auxiliary clamp below the lower jaw before closing it. In the text we reviewed, pretension must not exceed 0.5 % of full scale. A slack specimen adds a false toe and inflates elongation.
Zero: set the extension zero with the specimen clamped and pretensioned.
Slippage: mark the jaw edges; if a mark moved, that specimen's elongation is wrong even if its peak looks normal.
Compliance: small against 15 to 30 mm of fabric extension, but rubber faces add some; software compliance correction is good practice when elongation is a specification limit.
Where a video extensometer adds value
Clip-on knife edges slip on yarns and can start a break, and a grab specimen has no uniform gauge section, so contact extensometers are not used. A non-contact video extensometer helps in four cases: diagnosing slippage by comparing free-length strain with crosshead travel (the quickest way to set air pressure for a new fabric); measuring elongation on pinned or wrapped specimens; true strain and modulus on airbag, filter and protective fabrics in development; and labs whose frame also tests films to ASTM D882 or plastics. Report video strain as a labelled supplementary result alongside the standard apparent elongation.
The UGC-VE-2109 9 MPx camera gives 220 mm of field of view at ISO 9513 Class 0.5 (440 mm at Class 1), ample for a 75 mm gauge; the UGC-VE-2116 extends that to 330 and 660 mm. See when should you use an extensometer and the video extensometer buying guide.
ASTM D5034 test procedure, step by step
Step 1: Fit front faces 25 mm across the specimen and back faces at least as large; check insert orientation and run the carbon-paper check.
Step 2: Set 75 ± 1 mm clamp separation, 300 ± 10 mm/min (or the CRT speed) and a range that puts breaks between 10 % and 90 %.
Step 3: Cut 5 warp and 8 filling specimens, draw the 37 mm line, and condition or soak them.
Step 4: Clamp the upper jaw with the 37 mm line at the front-face edge and the long axis parallel to the load.
Step 5: For elongation, hang the 170 g auxiliary clamp, then close the lower jaw on the 37 mm line with even tension. Remove the clamp.
Step 6: Mark the jaw edges, zero the extension and run to rupture.
Step 7: Record maximum force, extension at maximum force and break location.
Step 8: Apply the jaw-break rules, replace discarded specimens, and keep warp, filling, conditioned and wet results separate.
ASTM D5034 calculations and worked examples
Breaking strength: the average maximum force of the acceptable specimens, per laboratory sample, direction and condition, in N or lbf. Never force per width: the effective width in a grab test is unknown.
Apparent elongation (%) = (extension at breaking force ÷ 75 mm) × 100, averaged. 1 lbf = 4.448 N.
Worked example: G-E, warp and filling
Warp maximum forces: 540, 515, 560, 530 and 555 N. Sum 2,700 N; average 540 N (121.4 lbf).
Warp extension at break averages 21.0 mm: 21.0 ÷ 75 × 100 = 28.0 %, reached in about 4.2 s at 5 mm/s.
Filling maximum forces: 402, 388, 415, 396, 421, 380, 409 and 397 N. Sum 3,208 N; average 3,208 ÷ 8 = 401 N (90.2 lbf).
Filling extension averages 16.5 mm: 16.5 ÷ 75 × 100 = 22.0 %.
Report 540 N warp and 401 N filling separately. Averaging them to 470 N hides the weaker direction.
Keep or discard?
A sixth warp specimen broke 2 mm from the upper jaw at 250 N. Half the average of the others is 540 ÷ 2 = 270 N; the break is within 5 mm of the jaw and below 270 N, so discard it and test a replacement. One that broke 4 mm from the jaw at 500 N is kept, because it is well above 50 % of the average.
Typical grab strength values
Light shirting, sheeting and nonwovens: roughly 200 to 500 N (45 to 110 lbf).
Medium apparel wovens and uniform fabrics: roughly 400 to 1,200 N (90 to 270 lbf).
Heavy canvas, workwear, upholstery and coated fabrics: often 1.5 to 5 kN.
These are indicative only; your specification minimum decides pass or fail.
Jaw breaks and slippage: the rules
Discard and retest specimens that slip, break in the jaws, or fall well below the set average for a test-related reason.
A break within 5 mm (0.25 in) of a jaw is discarded only if it is below 50 % of the average of the other breaks.
If specimens slip, or more than 25 % break within 5 mm of a jaw, pad the jaws, coat the fabric or change the faces, and report it.
Breaks along the front-face edge point to too much pressure, sharp face edges or a fabric that needs pins; corner breaks to faces that are not parallel; slippage without jaw breaks to too little pressure.
Precision: what difference is significant?
The precision statement comes from a 1991 study of three fabrics in three labs, two operators each. Single-operator coefficients of variation were roughly 2 to 5 %. For averages of five specimens, 95 % critical differences were roughly 3 to 7 % within one operator and up to about 16 % between labs. So a 5 % shift between lots on one machine may be real, while a 10 % gap against a supplier's lab may not be. Check the exact table in your current edition.
Testing fabrics at high and low temperature
D5034 is a room-temperature method in the D1776 atmosphere. Some automotive, airbag, hot-gas filter and protective-clothing specifications ask for grab strength at temperature, which is a reported modification.
Use an environmental chamber on the frame; ours run from −80 to +280 °C, with grips and faces rated for the temperature.
A temperature chamber does not hold the 65 % RH textile atmosphere, so compare only results tested the same way.
A video extensometer sees through the window to check slippage without opening the door. See the temperature chamber buyer's guide.
What to report
Standard and edition, procedure and machine code (for example G-E or MG-T).
Specimens per direction and condition; conditioning, soak time, wetting agent and any desizing.
Front and back face sizes and material, any padding, coating or pin wrap.
Force range, pretension and speed (or CRT time to break).
Average breaking strength and apparent elongation, separately for warp and filling and for conditioned and wet; discarded specimens and why.
Common ASTM D5034 problems and how to fix them
Front face turned sideways or too wide: the 25 mm dimension must run across the specimen.
Off-centre mounting: draw the 37 mm line on every specimen.
Too few filling specimens: 5 warp and 8 filling.
Averaging directions or conditions together: report each separately.
Reporting force per width: grab strength is a force.
Slow wet tests: over 2 minutes out of the water and the specimen dries.
Inflated elongation: slack mounting or slippage; use the auxiliary clamp and jaw marks.
Testing outside the conditioned atmosphere: cotton, viscose and wool change strength with humidity.
ASTM D5034 vs. D5035, ISO 13934-2 and sibling methods
ASTM D5035 shares the 75 mm gauge, 300 mm/min, 5 + 8 specimens, conditioning and jaw-break rules. The difference is what is gripped: D5035 clamps a 25 or 50 mm raveled or cut strip across its full width in faces at least 10 mm wider than the strip, so the result is the force for a defined width. See our ASTM D5035 complete guide.
Grab results are higher than strip results. In the 1991 study behind both precision statements, the grab averages (61.4, 112 and 240 lbf for a filter fabric, plain weave and sateen) were about 1.18, 1.26 and 1.32 times the strip averages (about 52, 89 and 182 lbf). The extra is yarn assistance, which varies with weave, so there is no conversion factor.
ISO 13934-2, the ISO grab method, is not equivalent: it typically runs at about 50 mm/min over about 100 mm, reports maximum force only and uses ISO 139 conditioning. Check the current ISO edition. Our ISO 13934-1 page covers the ISO strip method.
ASTM D4632: grab test for geotextiles.
ASTM D751: coated fabrics, with their own grab and strip procedures.
ASTM D6775: webbing, tape and braided material.
Related textile tests
ASTM D5035 strip test; ASTM D2261 tongue tear and ASTM D5587 trapezoid tear.
ASTM D3787 and ASTM D6797 ball burst; ASTM D2256 and ASTM D885 yarn and cord tensile.
All methods on our tensile testing and tear testing pages.
Complete ASTM D5034 equipment packages
Basic QC grab-test station
Mark-10 F505, or F1505 for heavy fabrics
Pneumatic grips with foot pedal, or vise grips, with 25 × 25 mm front and 25 × 50 mm back faces, smooth and rubber-coated
A specimen template or cutting die with an arbor press, a 75 mm gauge block and a 170 g pretension clamp
Advanced textile laboratory
Galdabini 5 kN or 10 kN UTM with method software for G, MG and CRT testing
Pneumatic grips with interchangeable grab and strip faces, so one frame runs D5034, D5035 and D2261
A pin-wrap fixture or wrap grips for high-strength fabrics
UGC-VE-2109 video extensometer and an environmental chamber
ASTM D5034 FAQ
What is the ASTM D5034 grab test?
The ASTM tensile test for textile fabrics in which a 100 mm wide specimen is gripped only across its centre 25 mm, with jaws 75 mm apart, and pulled at 300 mm/min to rupture. It reports breaking strength and apparent elongation. The current edition is D5034-21 (reapproved 2025).
What is the difference between a grab test and a strip test?
The grab test clamps only the centre of a wide specimen, so neighbouring yarns help carry load; the D5035 strip test clamps a 25 or 50 mm strip across its full width. Grab results were about 1.2 to 1.3 times strip results in ASTM's study, with no conversion factor.
What jaw-face size does ASTM D5034 require?
A front face 25 ± 1 mm across the specimen and 25 to 50 mm along the load, with a back face at least as large. A 25 × 25 mm front with a 25 × 50 mm back is the common kit, not the only compliant one.
What is the ASTM D5034 specimen size?
100 ± 1 mm (4 in) wide and at least 150 mm (6 in) long, or 95 mm plus twice the jaw-face length if longer. Many labs cut 100 × 200 mm.
Why is a line drawn 37 mm from the edge?
It centres the 25 mm front face on the 100 mm specimen: 37 mm of fabric on one side, 25 mm clamped and 38 mm on the other.
What speed and gauge length does D5034 use?
75 ± 1 mm between the clamps and 300 ± 10 mm/min (12 in/min) on a CRE machine, or a CRT set-up giving a 20 ± 3 s break, which is the referee condition.
How many specimens does ASTM D5034 require?
Five warp and eight filling per laboratory sample and condition. Three or five per direction does not meet the method.
What is the modified grab test?
The same specimen with slits cut in from both edges so only the central 25 mm of tested yarns carries load. It removes yarn assistance, is used mainly for strong wovens and reads lower than the grab test.
How is apparent elongation calculated?
Extension at the breaking force divided by the 75 mm gauge, times 100. For example, 21 mm gives 28.0 %. It is "apparent" because the fabric creeps slightly in the jaws.
Do I need an extensometer for ASTM D5034?
No. Elongation comes from clamp separation (crosshead travel). A video extensometer helps diagnose slippage, measure wrapped specimens and give true strain on technical fabrics, reported as a supplementary result.
Can I run ASTM D5034 on a Mark-10 tester?
Yes. 300 mm/min is within every F-series frame's standard speed range. The F505 suits most apparel fabrics; the F1505 (about 6.7 kN) suits heavy and coated fabrics.
What if the fabric breaks at the jaw?
A break within 5 mm of a jaw is discarded only if it is below 50 % of the average of the other breaks. If over 25 % break at the jaw or specimens slip, pad, coat or change the faces and report it.
Is ASTM D5034 the same as ISO 13934-2?
No. ISO 13934-2 typically runs at about 50 mm/min over about 100 mm and reports force only, so results are not interchangeable.
Related reading
Get a complete ASTM D5034 system
Universal Grip supplies everything for ASTM D5034: pneumatic and vise grips with grab and strip faces, pin-wrap fixtures and wrap grips for strong fabrics, cutting dies, video extensometers, environmental chambers, adapters for your frame, and machines from a Mark-10 tensile tester to a Galdabini universal testing machine. Tell us your fabrics, break forces and standards, and we will configure and quote a grab-test system. Contact us
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