Evaluate a non-woven geotextile manufacturer by the evidence connecting the proposed product to its raw materials, production controls, test results and delivered rolls. Factory size, certificate count and a nominal fabric weight do not establish that a grade is suitable for drainage, separation, protection or reinforcement.
The ten checks below are a practical buyer’s framework. They are not an industry certification scheme or a claim of a measured reduction in supplier failures. Set the required performance first, then ask each supplier to demonstrate it on a consistent basis.
Manufacturing illustration only. Displayed machine settings are not a specification or verified production record for the grade being offered.
1. Define the application before comparing factories
Tell bidders what the geotextile must do, what materials it contacts and what installation conditions it will face. A filter must retain the relevant soil while allowing the required flow. A protection layer must reduce damage to the adjacent liner under the actual loading arrangement. A fabric specified primarily for separation may have a different acceptance schedule.
State the proposed polymer, product construction, nominal mass, roll dimensions, required mechanical and hydraulic properties, exposure conditions and governing specification. Avoid selecting a 200 or 300 g/m² grade solely because that weight was used on another project.
2. Verify polymer and fiber-source declarations
Ask for the raw-material supplier, material grade, production batch, incoming inspection and connection to the finished product. Distinguish PET from PP and staple-fiber from continuous-filament construction. A description such as 6.6 dtex × 65 mm specifies fiber linear density and cut length; it is not an appropriate description of continuous filaments.
Require disclosure of virgin and recycled content where relevant to the contract. Neither a recycled-content label nor a virgin-resin label alone demonstrates durability or finished-product performance. Compare the proposed material against the project requirements and request evidence for the formulation actually offered.
A density test does not independently verify the percentage of recycled polymer. Likewise, a material supplier’s certificate must match the supplied grade and lot; a generic certificate bearing another company’s name is not sufficient traceability.
3. Check mass uniformity, not just the average label
ASTM D5261 is the geotextile mass-per-unit-area test method. Sampling positions and the specified acceptance basis matter: one small sample from the centre of a roll does not describe the entire production lot.
For an illustrative 300 g/m² target with a contractual ±5% band, the corresponding range is 285–315 g/m². This is arithmetic for that assumed contract, not a universal geotextile tolerance. Establish whether the requirement applies to individual results, an average or another statistical basis.
Request records that show how the manufacturer detects and handles cross-width or machine-direction variation. Review what happens when a line alarm or inspection identifies nonconforming production, rather than relying only on the presence of automated equipment.
4. Compare mechanical results using equivalent methods
ASTM D4595/D4595M-24 addresses wide-width tensile properties. A wide-width tensile value is not directly interchangeable with a grab-test value. Reports should identify the method, direction, specimen conditions and reporting basis.
ASTM D6241-22a measures puncture strength using a 50 mm probe. Its result is a test force, commonly reported in N or kN; it is not a pressure rating in MPa or a complete demonstration of field protection against a particular aggregate.
For a numerical comparison, hypothetical results of 3.8 kN and 2.6 kN differ by (3.8 − 2.6)/2.6 × 100 ≈ 46.2%. That calculation is meaningful only for comparable tests. It does not prove a particular fiber size or needling setting produces a 46.2% improvement, and the numbers here are not Jinseed test results.
5. Review hydraulic properties against the soil and drainage design
Ask for the opening-size and normal-to-plane flow properties required by the design. ASTM D4751 addresses apparent opening size; ASTM D4491/D4491M addresses water permeability expressed through permittivity under its test conditions. Different methods and units cannot be compared as though they represent the same measurement.
Permittivity is expressed in s−1; hydraulic conductivity is commonly expressed in m/s. A single clean-water flow result does not demonstrate long-term resistance to clogging with the site’s soil. An opening that is suitable for one soil may be unsuitable for another.
For a filter application, provide soil grading and relevant fines or plasticity information to the designer and testing laboratory. Where project conditions warrant it, request a soil–geotextile compatibility evaluation rather than choosing the supplier with the largest flow number.
6. Require exposure-specific durability evidence
ASTM D4355/D4355M-21 evaluates geotextile deterioration under xenon-arc light, moisture and heat exposure. Laboratory exposure hours do not directly equal outdoor service years. The method’s interpretation requires attention to the material and exposure conditions.
State the anticipated period before covering and any permanent exposure, temperature or chemical conditions. The project specification should define test durations and retained-property limits. Do not accept a universal “500-hour UV test equals 50-year life” claim.
For example, if tensile strength changes from 15 to 12 kN/m under a defined exposure, retention is 80%. Whether that passes depends on the agreed test method, exposure and acceptance requirement; it is not proof of an 80% service-life remainder.
7. Trace a delivered roll back to its records
Choose a roll number from actual inventory and ask the supplier to connect it to raw-material batches, production date, process records, finished-product tests and shipment documentation. A traceability demonstration is stronger than an untested promise that records can always be retrieved within a few hours.
Check that a report for “Sample A” cannot be substituted for a different delivered grade. Preserve sample identification and chain-of-custody information when independent testing is required. Decide in advance who selects, seals and sends samples and who retains the comparison samples.
8. Review laboratory competence and equipment control
ISO/IEC 17025 concerns the competence and consistent operation of testing and calibration laboratories. When accreditation is required, verify the laboratory’s current scope for the relevant methods through its accreditation body. Possession of a tensile machine is not equivalent to accreditation for a particular test.
Review equipment identification, calibration and intermediate checks, operator competence, conditioning and report approval. Calibration intervals should follow the laboratory’s justified control program and equipment history. Do not assume every instrument must be calibrated at the same fixed 12-month interval.
9. Put sampling and dispute rules into the purchase agreement
| Item to agree | Useful evidence or decision |
|---|---|
| Product identity | Grade, polymer, construction, nominal mass and roll dimensions |
| Acceptance schedule | Property, unit, test method, edition and acceptance basis |
| Sampling | Lot definition, frequency, selection responsibility and retained samples |
| Reports | Sample and roll IDs, test dates, results, limits and authorized approval |
| Nonconformity | Quarantine, notification, retest rules and disposition responsibility |
| Disputes | Agreed laboratory, comparable specimens, decision rules and costs |
A sampling interval such as one test group per 5,000 m² is only applicable if the governing specification or agreed plan establishes it. The appropriate schedule depends on the product, lot definition, variability, risk and required evidence.
10. Verify the system in operation
During a factory audit or remote document review, follow a real order through purchasing, production, testing, release and dispatch. Review a recent nonconforming lot and its disposition. Look for consistency between procedures and actual records, not just polished forms.
An unexplained record gap deserves investigation, but its significance depends on the required recording frequency. Similarly, a supplier’s claimed production speed, instrument count or process tolerance should be supported by current records before it is used in a purchasing decision.
For Jinseed non-woven geotextile, request the proposed grade and its supporting documents against your application requirements. A defensible supplier decision combines traceable material identity, relevant test evidence, production consistency and clear acceptance terms. Record any unresolved evidence gaps before placing the order.
