What are the key properties of 1100 H18 brushed aluminum sheets?
The 1100 H18 alloy is a commercially pure aluminum (99%+ Al) with excellent corrosion resistance and high thermal/electrical conductivity. The H18 temper indicates full hard condition, achieved through cold rolling for increased strength (tensile strength ~130 MPa). Brushed finishing creates a uniform linear grain pattern that hides fingerprints and minor scratches. These sheets are lightweight (2.71 g/cm³ density) and non-magnetic, making them ideal for decorative and EMI-sensitive applications. However, they have lower mechanical strength compared to alloyed grades like 3003 or 5052.
Brushing mechanically polishes the surface using abrasive belts or wheels, producing a satin-like matte finish. This process removes surface impurities while improving aesthetic consistency across large panels. The directional grain pattern can influence light reflection, reducing glare in architectural applications. Unlike anodizing, brushing doesn't alter corrosion resistance but may slightly reduce thickness (typically 0.01-0.03mm material loss). Proper brushing maintains the ASTM B209 standard flatness tolerance (±1% of width).
Common uses include interior décor (elevator panels, signage), kitchen backsplashes, and electronic enclosures where EMI shielding isn't required. Its formability allows for simple bending (minimum bend radius ≈1x thickness for H18 temper). The non-sparking property makes it safe for use near flammable materials. Architects favor it for façade cladding due to its cost-effectiveness and recyclability. Recent trends show growing adoption in DIY projects and art installations.
How should 1100 H18 brushed sheets be maintained?
Regular cleaning with mild soapy water and soft cloths preserves the brushed texture. Avoid alkaline or acidic cleaners that could etch the surface. For outdoor use, apply clear acrylic coatings to prevent oxidation spots. Unlike stainless steel, it shouldn't be polished as this destroys the brushed pattern. Storage in dry environments (<60% humidity) minimizes uncontrolled oxidation (white powder formation).
Verify thickness tolerances (e.g., ±0.05mm for 1mm sheet) per ASTM B209 standards. Confirm brushing direction (unidirectional or crosshatch) matches project requirements. Check for mill certifications ensuring proper temper (H18 hardness tested via Rockwell 15T scale). Compare pricing-1100 series is generally 15-20% cheaper than 3003 alloy. Lead times vary; custom brushing may add 1-2 weeks versus stock inventories.
