Structural Parameters Buyers Should Check

A reliable structure should be supported by measurable parameters. Buyers should not rely only on marketing language.

Straight-and-Curled Yarn Ratio

The yarn structure should be close to a functional 7:3 straight-to-curled ratio, depending on the application.

Buyers should also check whether the two yarn types have different mechanical roles:

• Straight yarn tensile modulus: preferably ≥1,000 MPa
• Curled yarn recovery rate: preferably ≥90%
• Functional difference between support yarn and recovery yarn

If both yarn types are nearly the same, the so-called mixed structure may not deliver real performance benefits.

Effective Straight-Yarn Tuft Density

Total density is not enough. Buyers should also evaluate the effective density of straight support yarns.

For a reliable non-infill structure, the straight-yarn tuft density should generally be no less than approximately 7,000 tufts/m², depending on the system design.

This is important because straight yarns provide the main upright support network. A product may have high total density, but if the support yarn density is too low, the field may still collapse or flatten.

Backing Performance

Key backing-related parameters should include:

• Yarn pull-out force: preferably ≥30 N, with higher values preferred for sports fields
• Hydrolysis strength retention: preferably ≥90%, with premium systems reaching around 95% after accelerated testing
• Peel strength and seam strength suitable for the intended field application
• Dimensional stability under moisture and temperature changes

For non-infill turf, backing performance directly affects service life.

Shockpad Mechanical Parameters

The shockpad should not be judged only by thickness. More important parameters include:

• Closed-cell rate
• Compression set
• Vertical deformation
• Shock absorption
• Moisture resistance
• Recovery under repeated loading

For many sports applications, vertical deformation around 5–8 mm and shock absorption around 40%–55% can provide a practical balance between cushioning and support.

Environmental Parameters

A professional non-infill turf system should also meet strict environmental requirements, especially for schools, community fields, and indoor sports spaces.

Recommended references include:

• Low heavy metal migration
• Controlled TVOC emissions
• Low odor
• No loose rubber granules
• No loose sand infill
• Reduced dust and particle migration risk
• Compliance with applicable standards such as GB/T 20394, GB 36246-2018, and relevant local or international testing requirements