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Category “Video”


Textile testing of cotton sheeting using the ASTM International D5034-09 Standard Test Method for Breaking Strength and Elongation (Grab Test) demonstrates the ability of the laboratory to characterize and provide corrective actions to manufacturers and importers based on the determination of assignable and common causes within the framework of a quality control program. Common causes of variation are those associated with everyday or typical on target mill performance. Assignable causes causes are those associated with a loss of control in the manufacturing process that can lead to production of products that fail important performance specifications.

The sample used comprised a plain weave square cotton sheeting whose structure is shown below using both reflected light and scanning electron microscopy:


Light Micrograph Of Plain Weave Textile Structure

Light Microscopy Micrograph Of Plain Weave Sheeting Fabric



Plain Weave Textile Structure Of Cotton Yarn

Scanning Electron Microscopy Of Plain Woven Structure


Testing was performed on Vartest’s Instron 5569 load frame running Bluehill 3 software with real time video capture as seen in the following image:


Video Capture Complements Graphical Force Elongation Curve And Tabular Analysis

Video Capture Provides The Ultimate In Specimen Performance Chracterization


A 100 specimen sample taken in the warp direction was tested on Vartest’s Instron 5569 Constant Rate of Extension Load Frame with interactive video capture as seen in following force elongation curves:


ASTM D5034 Specimens 1 through 25

Specimens 1 through 25


Specimens 26 through 50

Specimens 51 through 75

Specimens 76 through 100


Breaking force was exported and plotted as a control chart which revealed specimens 20 and 85 displaying variation attributable to assignable causes:


Control Chart For Breaking Force


Elongation at break was also exported and plotted as a control chart which revealed specimens 19, 20 and 85 displaying variation attributable to assignable causes.


Control Chart For Elongation At Break


Investigation of video capture files for these specimens revealed slippage at the jaw due to intentionally induced gradually decreasing low air pressure being introduced into the pneumatic clamps as the cause of excessive variation in specimens 20 and 21:


For comparison the break characteristics of Specimen 5 showing only common cause variation is shown in the following video:



Specimen 85 was revealed to be a filling direction specimen that had been intentionally introduced into the test specimen series. While the breaking force of the filling specimen was about 30% lower than the mean, the elongation at break was about 300% higher than the mean; predominantly due to the high level of filling yarn crimp possessed by the filling specimen as opposed to the relatively low amount of warp yarn crimp possessed by the warp specimens as seen in the following video:

Variation in textile quality can be quantified and managed readily with statistical tools used in conjunction with standard test methods and performance specifications.

Gaussian Sort Of Tested Specimens


Assignable causes of variation in textile and apparel quality such as uneven application of water resistant finishes, antibacterial finishes and seam slippage performance can all be analyzed and corrected with the aid of these techniques. Accredited quality assurance laboratories inform and control factory supply chains worldwide.

For more information click here for Instron’s Website.

Announcing service expansions & equipment updates

Vartest Laboratories continues to expand services for flammability, textile insulation and vapor resistance to facilitate performance assessment of safety and protective products and garments.

Vartest Laboratories demonstrates excellence in services provided to high technology and compliance markets, while maintaining unsurpassed breadth of methods and capabilities to the textile, apparel, home textile, and industrial markets, and military sectors. We are continually improving our offerings through investment in the latest technology and ISO-17025 accredited operations.

Recent additions and updates to the laboratories included:

  • Installation of new instruments for Thermal and Radiant Protective Performance (TPP & RPP) to meet ISO, EN, NFPA, ANSI and military requirements.
  • Updating of basic instruments for ASTM 6413 and NFPA 701 flammability testing.
  • Isothermal Sweating Hot Plate instrumentation along with a broad scope environmental chamber and remote access technology.
  • Our GCMS section is also supported by high performance microwave digestion and rotary evaporation instruments.
  • Near Infra Red Spectrophotometry for measurement of spectral reflectance.
  • Updated hydrostatic penetration capability.
  • Running all methods all methods including ASTM D751.
  • IL options ISO 811, AATCC 127 and others up to 200,000 millimeters of water pressure.

With this expanded capability, Vartest provides highly specialized protective performance assessment of products and applications related to development and production of fabrications dedicated to military, active sportswear and other specialized markets, which require elevated performance in unique environments.

Vartest sets itself apart with in-house testing using a fully automated large scale goniometric range for evaluation of high visibility trims, including all treatments required by ANSI 107, 207, EN 471 and CSA 96 protocols. It is this dedication and continued investment that positions Vartest as the undisputed leader in color measurement and spectral data in .qtx format, high visibility assessment and third party certification and compliance verification of high visibility safety and protective products and garments.

We invite your enquires and look forward to meeting all of your company’s testing requirements and greatly appreciate the opportunity to do so.