Price & Influencing Factors of Warp‑Knitted PET Geogrid
Price & Influencing Factors of Warp‑Knitted PET Geogrid
> Notes: Below are ex‑factory reference prices in 2026 (domestic China, tax‑exclusive and freight‑excluded). FOB prices apply for export business. Actual prices fluctuate with raw‑material cost, certification requirements and order volume, for reference only.
Domestic Ex‑factory Reference Price (CNY/㎡, Biaxial GSJ Series)
| Specification (kN/m) | Reference Price Range | Typical Application |
|---|---|---|
| 30‑30 | 1.1‑1.6 | Municipal roads, light‑loaded subgrade |
| 50‑50 | 1.6‑2.2 | Highway subgrade, slope protection |
| 80‑80 | 2.1‑2.8 | Arterial roads, soft‑soil improvement |
| 100‑100 | 2.6‑3.4 | Expressway, railway subgrade, retaining wall |
| 120‑120 | 3.2‑4.2 | Heavy‑load subgrade, high‑fill embankment |
| 150‑150 | 4.0‑5.5 | Railway, large‑scale retaining wall, mine project |
> Uniaxial warp‑knitted PET geogrid for retaining‑wall use costs 15%‑30% higher than biaxial grade at equal tensile strength. CRCC‑certified railway‑grade products carry an extra premium of 20%‑40% for the same specification.
> Export FOB reference: USD 0.45‑1.8 /㎡, subject to tensile strength, coating type and certification. Minimum order quantity usually ≥1000㎡.
Key Price‑determining Factors
1. Tensile Strength (Primary Factor)
Higher tensile strength requires more PET filament with higher unit‑area mass, directly raising material cost. Tensile strength is roughly proportional to weight per unit area under identical manufacturing conditions.*Pay attention to nominal tensile strength, junction efficiency and creep performance instead of weight only; some low‑cost products have over‑stated strength.
2. Coating Type
- Standard PVC coating: general subgrade application, baseline cost.
- Modified acid‑alkali‑resistant & UV‑resistant coating: for mines, saline‑alkali soil and open‑air slopes, price increases by 10%‑25%.
- Uncoated bare‑filament grade: lowest price but poor ageing resistance; only suitable for permanently buried non‑exposed conditions.
3. Product Structure: Uniaxial vs Biaxial
- Biaxial: mainstream for roads, soft‑ground improvement and slope protection.
- Uniaxial: for retaining‑walls and steep slopes; higher raw‑material consumption, higher unit price than biaxial products of equal strength.
4. Raw‑material Quality of PET Filament
- Virgin high‑strength industrial PET filament: stable performance and low creep, for standard‑grade critical‑project usage.
- Recycled regenerated fibre: lower cost but unstable creep and elongation, only for non‑critical projects.
Virgin industrial PET filament is mandatory for expressway and railway projects.
5. Certification & Testing Requirements
- Ordinary JT/T highway‑standard delivery‑batch inspection.
- Additional cost for CRCC railway certification, CE marking and full‑set third‑party ISO testing. Extra expenses occur if on‑site batch‑by‑batch third‑party inspection is specified by clients.
6. Order Volume & Roll Width
Large‑volume orders (≥50,000 ㎡) enjoy 8‑15% discount. Small‑batch orders have higher unit price. 4‑6 m is the cost‑effective standard width; custom narrow or extra‑wide rolls lead to price surcharge.
7. Transportation, Tax and Delivery Location
Geogrid features large‑volume medium‑weight rolls; freight accounts for a notable proportion of landed cost, especially for long‑distance delivery. Price differs between tax‑inclusive and tax‑exclusive quotations.
8. Commodity‑cycle Fluctuation of Raw‑material PET Chip
PET chip market volatility directly impacts polyester‑filament cost and causes quarterly price swings.
Risks of Low‑cost Products
1. Falsified tensile‑strength rating: sufficient weight but inferior‑quality fibre and low junction efficiency, resulting in long‑term creep deformation.
2. Ordinary woven PET geogrid disguised as warp‑knitted geogrid. Warp‑knitted structure delivers far superior junction strength than plain woven alternatives, with clear performance‑and‑price gaps.
3. Insufficient coating thickness: insufficient chemical‑ and ageing‑resistance, shortened service life under aggressive environments.
Procurement Suggestions
1. Place orders according to design‑specified tensile strength, junction efficiency and creep indicators rather than pure price comparison.
2. Virgin industrial PET filament and complete type‑test reports shall be required for highway‑railway critical‑projects.
3. Specify modified weather‑resistant coating for saline‑alkali and exposed‑service‑life scenarios.
4. Adopt consolidated bulk procurement to reduce comprehensive unit cost.
