Balance Community Materials test laboratory · SnapLab
Record W25AI
Product Mantra MK4
Reference standard ISA 41 v3 (Highline Webbing)
Batch test record
Mantra MK4W25AI
Production batch of Mantra MK4. Every figure below was measured on material drawn from this batch.
- Batch
- W25AI
- Product
- Mantra MK4
- Produced
- April 2025
- Status
- Released
- Manufacture location
- USA
- Sewing location
- In-house, Colorado, USA
- Destruction tests
- 20 in 4 configurations
- Dimensional results
- 3 measurements
- Elongation readings
- 3 ISA method
- Laboratory
- In-house SnapLab
1Product
- Material
- 100% Polyester
- Structure
- Flat
- Nominal width
- 25.4mm
- Nominal weight
- 76g/m
- Certification
- None assigned
2Dimensions
Measured on this batch
ISA 41 §7
3Elongation
Stretch under load
ISA 41 §9
200 mm gauge
| Load | Specimens | Mean | ||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| 1kN ISA | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| 5kN ISA | 1.5% | 1.5% | 1.5% | 1.5% | 1.5% | 1.5% |
| 10kN ISA | 4.0% | 3.75% | 3.5% | 3.5% | 3.5% | 3.65% |
Rows marked ISA follow the standardized ISA stretch method on a 200 mm gauge, read at the method’s own load steps; the 1 kN row is the reference reading the gauge was marked at. Measured this way, the figures are directly comparable between webbings.
The stretch sample's loops were sewn with pattern 512 (Bartack ramp for 25 mm webbings). Sewing details.
4Tensile strength
4 test setups, reported separately
ISA 41 §10 / §11
App. G
Each configuration is reported separately and never pooled with another. Specimen numbering restarts within each one.M6
4.1Summary of findings
Breaking force by test configuration
| Configuration | Samples | Mean | Std. dev. σ | 3σ MBS |
|---|---|---|---|---|
| Blue Whale to Blue Whale Determines Batch MBS | 5 | 41.69kN | 0.30kN | 40.80kN |
| Alpine WebLock 6 to Alpine WebLock 6 | 5 | 39.43kN | 0.70kN | 37.35kN |
| MightyLock to MightyLock | 5 | 35.36kN | 1.00kN | 32.37kN |
| Sewn Loop to Sewn Loop | 5 | 36.10kN | 0.79kN | 33.73kN |
3σ MBS is the mean breaking force less three population standard deviations, per ISA 41 Appendix G.
4.2Blue Whale to Blue Whale
Determines Batch MBSProcedure · Blue Whale to Blue Whale
Determines the webbing's own MBS. This device, the Blue Whale, is based on the device used by the ISA for testing the strength of slackline webbings. We have created our own version that has a slightly different anchor method for the tail and modified anchor hole to fit our test machine. The device has an 80mm drum that the webbing wraps around and is ultimately anchored at the back of the device with a short sewn loop.
The Blue Whale is anchored to the test bed directly, with each end in opposite orientations. The webbing wraps around each side in opposite ways to allow for even stretching across the width and thickness of the webbing to prevent uneven loading caused by bent samples. Since the webbing is ultimately anchored with a short sewn loop, the entire sample is able to be tested as there are no tails exiting the sample space.
Sample Length - 2.0 m (6.5 ft)
Pull Rate - ~350 mm per minute
- Specimens
- 5
- Mean force
- 41.69kN
- Std. deviation σ
- 0.30kN
- 3σ MBS
- 40.80kN
| Specimen | Breaking force |
|---|---|
| Sample 1 | 41.36kN |
| Sample 2 | 41.95kN |
| Sample 3 | 41.38kN |
| Sample 4 | 41.65kN |
| Sample 5 | 42.1kN |
4.3Alpine WebLock 6 to Alpine WebLock 6
Procedure · Alpine WebLock 6 to Alpine WebLock 6
Determines strength retention in the 6-series Alpine Weblock.
Each AWL6 is anchored to the test bed with a Van Beast Shackle (usually 1/2" or 5/8", depending on the webbing strength). The webbing sample is installed in each weblock in the same orientation on both ends with a minimal tail (75 - 150 mm (3 - 6 inches)). The sample is then pulled to failure.
Sample Length - 1.5 m (5 ft)
Pull Rate - ~350 mm per minute
- Specimens
- 5
- Mean force
- 39.43kN
- Std. deviation σ
- 0.70kN
- 3σ MBS
- 37.35kN
| Specimen | Breaking force |
|---|---|
| Sample 1 | 39.32kN |
| Sample 2 | 38.6kN |
| Sample 3 | 40.71kN |
| Sample 4 | 39.14kN |
| Sample 5 | 39.4kN |
4.4MightyLock to MightyLock
Procedure · MightyLock to MightyLock
Determines strength retention in the MightyLock line-locker ring.
We have a Mightylock installation at both ends of the webbing. The webbing is wrapped around the MightyLock in the Right-Side-Up configuration and anchored to either a 5/8" Van Beast Shackle (if it's a 25mm/1-inch webbing) or a 1/2" Van Beast Shackle (if it's a 19-20mm webbing). The tails are kept to a minimum on both ends (75 - 150mm (3 - 6 inches)).
Sample Length - 1.5 m (5 ft)
Pull Rate - ~350 mm per minute
- Specimens
- 5
- Mean force
- 35.36kN
- Std. deviation σ
- 1.00kN
- 3σ MBS
- 32.37kN
| Specimen | Breaking force |
|---|---|
| Sample 1 | 36.16kN |
| Sample 2 | 35.82kN |
| Sample 3 | 34.8kN |
| Sample 4 | 36.36kN |
| Sample 5 | 33.68kN |
4.5Sewn Loop to Sewn Loop
Procedure · Sewn Loop to Sewn Loop
Determines strength retention in a sewn loop. The particular pattern used for sewing is indicated on each test.
Each sewn loop is done in an opposite direction in order to take out the possibility of failure by uneven loading across the width and thickness of the webbing. Each sewn loop is directly attached to the clevis pins on our test machine, with a diameter of pin diameter of 19mm.
These tests are often used as our elongation tests as well, since they experience the least change in length within the anchoring method.
Webbing starting length - 1.5 m (5 ft)
Pull Rate - ~350 mm per minute
Sewing pattern Pattern 512
Loop pattern behind these specimens
Sewn Loop
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- Pattern dimensions
- 65.5 × 20 mm (L × W) (2.6 × 0.8 in)
- Opening size
- 139 mm (5.5 in)
- Webbing fold
- 210 mm (8.3 in)
- Sleeve length
- 200 mm (7.9 in)
- Bobbin thread
- Amann Xtreme Tech with Dyneema · 220-tex · Yellow
- Needle thread
- Amann Xtreme Tech with Dyneema · 220-tex · Red
- Stitches
- 176
Needle threadBobbin threadSleeveModelled to scale.
Written specification
- Pattern
- 512end loop, folded
- Fits webbing
- 25 mmnominal width
- Webbing
- 25.4 × 3.5 mm nominal W × T
- Stitch density
- 2.7 per mmover the pattern length
- Opening range
- 25 to 300 mm settable when the end is built
- Drawing source
- Machine pattern file stitch run plotted to scale
- Specimens
- 5
- Mean force
- 36.10kN
- Std. deviation σ
- 0.79kN
- 3σ MBS
- 33.73kN
| Specimen | Breaking force |
|---|---|
| Sample 1 | 35.71kN |
| Sample 2 | 36.3kN |
| Sample 3 | 36.82kN |
| Sample 4 | 36.9kN |
| Sample 5 | 34.77kN |