Gray Natural Block - Size: 4x4x2.5-3

Gray natural blocks have various specifications depending on their intended use and manufacturer. Here are some key specifications to consider:

Material and Composition
- Material: Gray natural blocks can be made from concrete, natural stone, or a combination of both.
- Composition: Some blocks may have a high porosity level, around 99%, which affects their water absorption and durability .

Size and Dimensions
- Thickness: Gray natural blocks can range from 10mm to 60mm or more in thickness, depending on the application.
- Length and Width: Blocks can be rectangular, with dimensions such as 6 inches, 8 inches, or 16 inches in length and width.
- Size Variations: Some blocks may have specific dimensions like 200x100x60mm or 4x12x7 inches .

Physical Properties
- Weight: Blocks can weigh around 12 pounds or more, depending on their size and material.
- Color: Gray natural blocks typically have a monochromatic gray finish, but some may have variegated colors.
- Texture: Blocks can have a smooth or textured surface, depending on the manufacturing process.

Applications and Uses
- Building Facades: Gray natural blocks can be used for building facades, retaining walls, and garden walls.
- Landscaping: They're suitable for landscaping projects, such as creating garden beds, pathways, and patios.
- Structural Walls: Blocks can be used for structural walls, edging, and retaining walls .

Certifications and Compliance
ASTM Compliance: Some gray natural blocks meet ASTM C90 specifications for concrete blocks.
Acid Resistance: Certain blocks may be acid-resistant, making them suitable for specific applications