ISO 17025 is an international standard which defines all the general and specific requirements for the competence of the testing and calibration laboratories. This is the standard that helps ensure laboratories establish, implement, and maintain a quality management system, ensuring the tests performed in the lab are valid, reliable, and traceable.
ISO 17025 Ensuring Competence in Testing and CalibrationApplying ISO 17025 to Martindale Tester — Expanded Calibration & Maintenance Checklists
Application of an ISO 17025 requirement as technical work, resources and processes to prepare a clear, well-documented plan for maintaining and calibrating a Martindale abrasion / pilling tester, similar to the DaRong pilling and abrasion tester.
Daily Inspection and Pre-Use Checks Points
Before every test run, always ensure:
- Perform the overall visual inspection of the tester, such as checking abrasive discs or pads, the sample holding clamp, wear, or cracks
- Do alignment and mounting checks, such as testing that the specimen is mounted without twist, that the clamps hold uniformly, and that the is no sample distortion.
- Always check the mechanical and motion check by running a blank cycle to confirm smooth motion and observe that the motion arms, rotation disc, stroke path and specimen holders are moving uniformly.
- Check the environmental conditions in the testing area, including temperature and humidity.
- Maintain a logbook, recording the date, operator name, and observations, and mark OK or add findings or corrective actions if required.
Weekly/ Monthly Maintenance and Verification
- Lubrication and mechanical maintenance must be performed by lubricating the bearings, sliding guides, joints, checking the linkages, crews, bolts, and springs for wear or looseness. Replace or adjust if wear as observed.
- Consumables check and replacement, such as abrasive disks or pads, felt pads, clamps and specimen holders. Replace when wear exceeds the defined threshold. Use only the tester manufacturer-recommended consumables to maintain the consistency of the test.
- Check the function of the control system, such as verification of timers, stroke counters, the frequency of strokes, and the motion sensor.
- To ensure the black-cycle or reference run, a test is performed using a standard blank of reference fabric, per the testing procedure, to verify processes such as motion, load, and frequency.
- Calibrate the load/pressure settings in the adjustable tester by verifying that the wright or load arms deliver the correct pressure by using certified calibration weights.
All these points satisfy ISO 17025’s equipment, metrological traceability and ensure the quality requirements.
Annual Calibration and Full Verification
Perform a comprehensive calibration and verification method, including:
- Load/pressure calibration by using certified, traceable weights and verify applied load matches the standard required by the testing method, such as ISO 12947-2 of ISO 12945-2
- Motion path of stroke verification by measuring the stroke length, trajectory, circulatory motion diameter, and also verifying the RPM (strokes per minute) with an appropriate device and ensuring that the tester is within the specified tolerance.
- Accuracy of the cycle counter and timer by testing digital or mechanical counters vs an external reference.
- Testing with reference material, for example, running pilling or abrasion test using a certified standard reference fabric under defined standard conditions as per the testing procedure and comparing the results to detect the deviation.
- Replace wear-critical parts, such as abrasive discs, specimen holders, clamps, springs, belts, and bearings, and maintain a parts-change history.
- Environmental control equipment calibration by using instruments for conditioning, such as a thermo-hygrometer, a temperature-humidity sensor or HVAC controllers, which must be calibrated and maintained.
- Generate a calibration certificate or report which includes the serial number of the tester, date, technician name, equipment used for calibration, measured parameters, deviation and adjustments made, uncertainties, and validity period.
These points are fulfilling ISO 17025 requirements.
Points must be checked in visual inspectionPower Up the Martindale Tester Maintenance / Calibration Program
Integrate the calibration and maintenance routines directly into your quality management system for consistency and reliability by following the points below:
- Make SOPs for Martindale tester calibration & maintenance on a daily, weekly/monthly, and annual basis
- Add a calibration schedule to the master equipment list of the lab
- Maintain proper logbooks (daily or weekly inspection, maintenance and calibration certificates) under controlled documents
- Establish a responsibility matrix for lab staff detailing who is responsible for inspections, calibrations, log entries, and audits, etc.
- Use controlled templates for calibration reports, test reports and nonconformity reports.
Example Logbook / SOP Template (Outline)
Below are given the outlines of the logbook template for integrating Martindale maintenance and calibration into the lab QMS.
- Date
- Operator Name
- Tester ID / Serial No
- Visual inspection (Abrasive disc, pads, clamps)
- Mounting clamps alignment
- Lab environment (Humidity and temp)
- Motion check (Blank cycle)
- Remarks
Weekly / Monthly Maintenance Log
- Date
- Maintenance performed (yes/no)
- Lubrication done (yes/no; lubricant used)
- Consumables inspected — disc/pad condition, clamps, springs, bearings (OK / Replace)
- Control system check (timers, counters, motor, sensors) — OK / Remarks
- Blank-cycle verification (pass/fail) + any deviations corrected
- Operator name
- Remarks / parts replaced
4.3 Annual Calibration Report (template)
- Lab name, address, accreditation status
- Tester ID / Serial No., model (e.g. Darong Martindale YG(B)401T)
- Date of calibration; technician name & signature
- Equipment used for calibration (calibration weights, tachometer, gauge, etc.) — with their serial numbers. and traceability certificate number
- Measured values vs. standard values:
Applied load (N / kg) — the reading, deviation, tolerance, and corrective action
• Stroke length / motion path — measured vs specified, deviation, adjustments
• Stroke frequency (RPM / strokes/min) — reading vs standard, deviation, corrections
• Cycle counter verification — reading vs external count, deviation - Environmental conditions during calibration (temp, RH, lab conditions)
- Uncertainty estimation (brief)
- Statement of conformity / non-conformity
- Next calibration due date
- Remarks / parts replaced (if any)
- Signature and approval
Trust, Credibility & Audit Readiness — Role of Manufacturer
5.1 Why Using a Standard‑Drafting Manufacturer (DaRong) Helps
Darong is an international-standard drafting unit for textile testing instruments, and its instruments are used all over the world. Their Martindale tests are specially designed with metrological rigour and adherence to international standards, such as ISO and AATCC testing standards. Darong offers mechanical stability, precise weight application, accurate motion control, and reliable consumable parts, which reduce the frequency and extent of corrective maintenance and calibration, leading to accurate, repeatable testing results. Using the DaRong Martindale test will strengthen the lab’s case in audits and demonstrate that your instruments are specifically designed for textile testing and conform to recognised standards.
Modern pilling and abrasion tester made by DarongConclusion & Recommendations
For labs that utilise a Martindale abrasion or pilling tester, especially those made by a standard-drafting manufacturer like Darong, compliance with ISO 17025 requirements provides strong technical and administrative foundations, including traceable calibration, a validated method, a controlled environment, robust documentation, and systematic maintenance.
FAQs
What is ISO 17025, and why is it important for textile laboratories?
To ensure the competence of testing and calibration labs, the international standard ISO 17025 was established, which requires labs to generate accurate, reliable, and traceable test results.
How often should a Martindale Abrasion of Pilling Tester Be Calibrated?
Usually, the calibration frequency depends on instrument usage, environmental conditions and lab policies, but a typical schedule includes daily checks, weekly, monthly and annual calibrations.
How does DaRong’s role as a standard-drafting unit benefit ISO 17025 compliance?
Darong designs instruments in accordance with national and international textile testing standards, with high metrological precision, reducing initial measurement uncertainty and providing documentation and technical support compliant with ISO 17025 requirements. This reduces audit risk by providing high-quality, traceable equipment from a reputable manufacturer.
How do I maintain ISO 17025 compliance across multiple Martindale testers in a single lab?
I recommend maintaining a master equipment list that includes the instrument’s serial number, calibration status, next calibration due date, and the responsible personnel for each instrument. Implement an internal audit covering all machines to ensure compliance, and apply cross-checks between machines when using reference fabrics to ensure consistency.
Related Resources
Pilling vs Abrasion: How to Switch Your Martindale Tester Configuration Correctly
Martindale Troubleshooting Guide-5 Common Problems and How to Fix Them
The Lissajous Figure Explained: Why It Defines Your Martindale Test Accuracy