In most cases, age 15-60 years of occupation are employed in General and private business. Structural materials, synthetic material that can be maintained and has a long lifetime, so that the material used was very helpful.
The most commonly employed aged 15-60 years with professional and private business. To structure a synthetic material to maintain and last for a long time. The materials used to make the most useful.
The majority 15-60 years The profession is employed and the general business Want to make structural materials of synthetic materials that can maintain life, and ได้ยาวนาน So the material used was the greatest advantage