Technical Bulletins


Use of SMA in Hong Kong

SMA was developed in Germany in mid-1960s and it has spread throughout Europe and across the world in 1980s and 1990s. The excellent performances include resistance to mechanical and temperature deformation (cracking and rutting), resistance to weathering actions such as aging and low-temperature cracking. Durability is excellent even under slow moving heavy traffic. The textured surface increases skid-resistance and provides environmental and driving comfort by reduced noise level, and improved visibility in rainy days.

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Performance and development of robust SMA in Hong Kong

Despite wide application of SMA in its homeland since invention in Germany in 1960s and wide acceptance by many other countries in 1980s and 1990s, performance of SMA may not be so consistent in some parts of the world. Hong Kong has had different experiences.

SMA is renowned for its structure of “stone-on-stone contact” and thick binder film, which provides superior performances including mechanical and temperature deformation resistance, cracking resistance, rutting resistance, weathering resistance (such as aging and low-temperature cracking), and excellent durability, skid-resistance, noise reduction and reduced hydroplaning. Use of cellulose fibre is an outstanding feature that allows SMA to retain thick binder film which helps its durability.

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