1235 hard temper aluminium foil
Aluminium foil is a staple material across various industries due to its lightweight, corrosion resistance, and exceptional malleability. Among numerous grades, 1235 hard temper aluminium foil stands out for its specific blend of physical strength, chemical consistency, and practical utility.
1235 Hard Temper Aluminium Foil
1235 aluminium alloy is an essentially pure aluminium product with an aluminium content of minimum 99.35%. It belongs to the 1xxx series, which focuses on high purity and excellent corrosion resistance rather than significant strength enhancements from alloying.
The term “hard temper” refers to the mechanical state introduced through cold rolling operations, meaning the foil has undergone strain hardening to increase tensile strength and hardness without heat treatment. This temper is typically denoted as H18 or sometimes just Hystall-grade, implying full-hard temper with the highest strength due to extensive cold working.
Core Chemical Composition (1235 Alloy)
| Element | Content Range (wt%) |
|---|---|
| Aluminium (Al) | 99.35 min |
| Iron (Fe) | 0.40 max |
| Silicon (Si) | 0.30 max |
| Copper (Cu) | 0.05 max |
| Manganese (Mn) | 0.05 max |
| Zinc (Zn) | 0.05 max |
| Titanium (Ti) | 0.03 max |
| Others | 0.05 max combined |
This chemical composition results in a highly pure aluminum foil with certain metallic impurities that do not significantly affect corrosion resistance or formability, yet enhance specific attributes critical for heavy handling.
Alloy Tempering and Mechanical Properties
| Parameter | Typical Value (H18) |
|---|---|
| Tensile Strength | 165 - 200 MPa |
| Yield Strength | 145 – 170 MPa |
| Elongation | 1-3 % (reflecting hard temper) |
| Thickness Range | 5 µm to 50 µm (commonly available) |
| Density | 2.70 g/cm³ |
Technical Standards and Measurements
- ASTM B479 / B151ASTM sets standards for Aluminium Alloy 1235 products, including hardness grades and dimensions.
- ISO 6361 - which covers aluminium and Aluminium alloy sheets, strips, and plates.
- JIS H4000 can apply to similar grades in Japan.
The verification of thickness, tensile strength, elongation, and surface finish quality aligns with international standards, guaranteeing product uniformity and predictable performance.
Functions and Benefits — A Deeper Dive into Performance
Mechanical Strength: The cold working applied to achieve the hard temper significantly increases foil rigidity and tensile strength, allowing 1235 hard temper foil to be used when mechanical durability is necessary. Its minimum elongation shows it is less pliable than soft temper foils; therefore, it avoids deformation during packaging, laminating, or artful embossing but still remains flexible enough for shaping.
Barrier Properties: Despite its thin profile, 1235 hard temper foil retains excellent barrier properties against oxygen, moisture, and odors, ideal for sensitive packaging applications such as pharmaceuticals and perishables.
Corrosion Resistance: The exceptional purity ensures resistance against corrosion in mildly aggressive environments, enhancing shelf life and product safety.
Thermal Conductivity: With thermal conductivity around 235 W/m·K, it works efficiently in cooking applications, heating elements, and heat exchangers by providing fast and even heat distribution without corrosion or degradation.
Distinctive Applications of 1235 Hard Temper Aluminium Foil
The hard temper quality opens doors to specialized applications where flatness, strength, and moisture barrier reliability must coincide:
- Industrial Insulation: Sheets for thermal insulations that require strength to sustain external loads during installation.
- Electrical Capacitors: Acts as an anode foil in electrolytic capacitor manufacture, leveraging its crack resistance and conductivity.
- Transformer and Generator Manufacture: Used as shielding foils withstanding repetitive vibrations and temperature flux due to elevated strength.
- Consumer Packaging: While soft tempers suit variable folds, hard temper foils are preferred when pack configurations require schizophrenia—flat sealing without compromise.
- Laminates for Automotive & Aerospace Components: Adopting 1235 H18 foil in multilayer composites contributes mechanical integrity & corrosion resist in harsh conditions.
Manufacturing and Implementation Insights
Achieving hard temper in 1235 aluminium foil involves extensive cold rolling without thereafter annealing – hence the H18 designation "full hard." Controlled reduction at room temperature mobilizes metal dislocations increasing yield stress at the cost of ductility.
Suppliers routinely test mechanical and chemical conformity, pursuing rigorous QA inspection in thickness ranging as slight as 5 microns to bulk 50 microns depending been welding or lamination methods.
The characteristic surface finish is repetitive bright and non-anodizing nature one finds in primary foil forms for further customization.
Final Thoughts
1235 hard temper aluminium foil offers a niche yet critical balance—purer-grade aluminium alloys stiffened by cold work that propels it from household utility to indispensable industrial role player. Its intrinsic characteristics of strength, thinness, resistance to corrosion, and performance in heat/enviro barriers, affirms its core position in capacitor manufacture, heat exchangers, and avatar packaging demands where form and function pair seamlessly—aluminum foil perfected down to its molecular composition and temper design.
Combined with adherence to international parameters like ASTM B479, the 1235 H18 foil legacy expresses robustness crafted through metallurgical consciousness and technical rigor.
Explore 1235 hard temper aluminium foil for your project today and experience aluminum's resilience in its highest functional definition!
Sources & Standards Reference:
- ASTM B479 Standard Specifically for Aluminium Alloy Foils
- International Aluminium Institute Data on Alloy 1235
- ISO 6361 for Aluminium Sheets and Foil
- Reliable Metallurgical Handbooks on 1xxx series tempers
This comprehensive view dives beyond general characteristics, showcasing how discerning engineering choices transform 1235 Aluminium foil from raw metal into finely-tuned industrial solutions.
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