Artificial Grass Infill Materials Explained
As is well known, "artificial turf" might not be entirely unfamiliar to everyone. However, the reason why it can stand upright and feel springy when stepped on actually lies in the filling material hidden within the grass yarn. The so-called filler is the layer of fine particles that is filled in after laying the artificial lawn Without them, the "synthetic grass" would be as flat as a carpet, with the grass yarn quickly collapsing and the lifespan greatly reduced. The core function of the filler is to provide support, keep the grass yarn upright, and simulate the buffering effect of natural soil. Therefore, choosing the right filler directly determines the foot feel, safety, and durability of a piece of "synthetic lawn".
The most common filling materials for" are quartz sand and rubber particles. Quartz sand is cost-effective and heavy, which can firmly hold the grass and prevent it from being blown away by the wind. However, it is rather hard and offers limited cushioning when someone falls. Rubber granules (mostly made from recycled tires) have good elasticity and can significantly reduce the impact force during sports activities. They are commonly used in football fields and other frequently used "synthetic turf" areas. Nevertheless, rubber emits an odor under the hot sun and may contain trace amounts of heavy metals. In recent years, some high-end "fake grass" has begun to use thermoplastic elastomers (TPE) or plant-based fillers. These materials are environmentally friendly and non-toxic, but they are more expensive.
Apart from materials and costs, there are also certain requirements for the filling depth and particle shape. For home landscape-type "fake lawn", typically 8-10 kilograms of quartz sand are needed per square meter, with the particles mostly being rounded stones to avoid damaging the grass yarn. For sports-type "fake turf", a double-layer filling of sand and rubber is used: the lower layer of sand serves as a stabilizer, and the upper layer of rubber provides cushioning. The total filling amount can reach 20-25 kilograms per square meter. In terms of particle shape, round particles are smoother than crushed particles, but crushed particles have stronger locking ability. During professional installation, a special grass-scrubbing machine is used to repeatedly comb through, ensuring that the filling material evenly settles at the base of the grass yarn. Otherwise, "artificial grass" may develop depressions or the grass yarn may not stand upright.
Finally, the filling material is not always suitable for use. After being used for three to five years, the sand will become powdery and the rubber will age and harden, resulting in a decrease in the cushioning effect of the "artificial lawn" and accelerated breakage of the grass yarn. Therefore, professional maintenance requires regular inspection of the thickness of the filling layer and replenishment of new particles. Additionally, pet urine and the decay of fallen leaves can also accelerate the compaction of the filling material. For home "artificial lawn", it is recommended to clean and loosen them with disinfectant every six months or once a year. In summary, understanding the characteristics of the filling material is like choosing the right sole for an "artificial turf" - it needs to be both slip-resistant and cushioning, as well as durable and environmentally friendly. Selecting the filling solution that suits your usage scenario is the key to making this "artificial grass" truly safe, attractive, and long-lasting.
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