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When choosing materials for structural work, consider these 5 key factors:

1. Suitability for the Application: What type of structure is it? How much weight does it need to support? For example, a typical house will use different materials than an industrial factory. A house might use standard reinforced concrete, while a factory might require structural steel.

2. Strength and Durability: The material must be able to withstand the designed loads and forces, and be durable against environmental conditions such as humidity, heat, and corrosion.

3. Quality and Standards: Choose materials of good quality that meet relevant standards (e.g., ASTM, EN). This ensures safety and a long service life.

4. Budget: Select materials that are appropriate for the budget, considering long-term value and quality.

5. Availability: Choose materials that are readily available in your area to ensure convenience and minimize transportation costs.
In summary, choose materials that are suitable for the application, strong, durable, of good quality, meet standards, are within budget, and are easily available.