Food-Grade Color Coated Aluminium Circles for Cookware Manufacturing — Full Spec Guide

Introduction

Every wok, frying pan, and stewing pan starts the same way: as a flat, circular disc of aluminum — an aluminium circle. But not all aluminum circles are created equal. For cookware that touches food every single day, the circle must be manufactured from food-grade alloys, coated with food-safe paint, and formed with precisely controlled temper and thickness so that deep drawing produces smooth, defect-free pots and pans.

At Dingang, we manufacture food-grade color coated aluminium circles specifically for the cookware industry — used by leading pot and pan manufacturers to produce woks, frying pans, stewing pans, and non-stick cookware. In this guide, we break down the complete specification: alloys, temper grades, dimensions, food-grade coating standards, and the manufacturing process that ensures your cookware blanks meet both performance and food-safety requirements.

What Is a Food-Grade Color Coated Aluminium Circle?

A color coated aluminium circle is a pre-painted, circular aluminum disc that serves as the starting blank for deep-drawn cookware. Instead of a bare aluminum disc that the pot maker must coat later, a color coated circle arrives with a factory-applied, food-grade paint finish on one or both sides — ready to be pressed, deep-drawn, and finished into the final pan body.

The term "food-grade" refers to two things: the aluminum alloy itself must be a composition approved for food contact, and the coating must be a food-safe paint system that will not release harmful substances when in contact with food, high heat, or cooking oils.

At Dingang, our food-grade circles use AA1060 and AA1100 aluminum alloys — both recognized for excellent formability and food-contact suitability — coated with food-grade safety paint in a controlled factory environment, ensuring consistent, compliant blanks for every cookware manufacturer.

→ View Dingang Food-Grade Non-Stick Cookware Aluminum Circle — Specs & Inquiry

Key Specifications at a Glance

Why Food-Grade Aluminum Circles Are Essential for Cookware

1. Food-Contact Safety Comes First

Cookware is in direct contact with food, high temperatures, oils, and acidic ingredients such as tomatoes and vinegar. A circle made from non-food-grade material — or coated with industrial paint — can leach heavy metals or harmful chemicals into food during cooking. Food-grade circles use approved alloys and food-grade safety paint that are formulated to be stable and non-migrating under cooking conditions, protecting both consumers and cookware brands from compliance and liability risks.

2. Superior Deep-Drawing Formability

Turning a flat disc into a seamless wok or pan body requires deep drawing — a demanding process that stretches the metal into a three-dimensional shape. Alloys AA1060 and AA1100 are renowned for their excellent ductility and deep-drawing performance, producing smooth, wrinkle-free, crack-free pan bodies without tearing. The temper grade (O, H14, H26) is selected to match the drawing depth and wall-thinning requirements of each pan design.

3. Excellent Thermal Conductivity for Even Cooking

Aluminum is one of the best thermal conductors among metals. A pan body formed from a pure aluminum circle (1060/1100) heats up quickly and distributes heat evenly across the cooking surface — eliminating hot spots that cause scorched food. This is why aluminum remains the core material of choice for professional and home cookware, even under non-stick or clad multi-layer constructions.

4. Lightweight & Corrosion-Resistant

Aluminum cookware is lightweight and easy to handle — roughly one-third the weight of cast iron or steel. Combined with its natural corrosion resistance and the protective food-grade coating, the finished pan resists rust, staining, and degradation over years of daily use, washing, and dishwasher cycles.

5. Factory Coating Saves Production Time & Improves Consistency

For cookware manufacturers, starting with a pre-coated circle eliminates the need for in-house painting and curing lines. Consistent, factory-controlled coating thickness and color reduce rejects, shorten time-to-production, and ensure every blank matches the same quality standard — critical for large production runs and brand consistency.

Understanding the Specification: Alloys, Tempers & Coatings

Alloy Choice: AA1060 vs AA1100

Temper Grades and What They Mean

• O (Annealed) — Softest, maximum formability. Used for deep-drawn shapes requiring the most severe deformation.

• H14 (Half-hard) — Balanced strength and formability; the common choice for general cookware deep drawing.

• H26 (Strain-hardened 3/4 hard) — Higher strength for lighter draws where wall rigidity matters.

Your pan design, drawing depth, and final thickness requirements determine the correct temper. Dingang can supply O, H14, H26, and custom tempers to match your tooling and drawing process.

Food-Grade Coating Standards

The coating on a food-grade circle must be:

• Food-contact compliant — no heavy metals (lead, cadmium, etc.) or restricted substances

• Heat-stable — no degradation, blistering, or off-gassing under cooking temperatures

• Oil & acid resistant — stable against cooking oils, vinegar, tomato, and citrus

• Adhesion-strong — bonds firmly to the aluminum so it survives deep drawing without flaking or cracking

Dingang applies food-grade safety paint (with polyester paint options) in a controlled coating line, and each production batch is verified for coating uniformity and adhesion to support your food-safety documentation and certifications.

Manufacturing Process: From Coil to Finished Circle

Understanding how food-grade circles are made helps you specify the right quality. The typical process at Dingang:

1. Coil selection — AA1060/AA1100 aluminum coil of confirmed purity and temper

2. Surface preparation — cleaning and chemical pretreatment for optimal paint adhesion

3. Coating — food-grade paint applied by roller coating to precise, uniform thickness

4. Curing — oven-cured to develop full durability, adhesion, and food-safety properties

5. Blanking / stamping — circles punched from the coated sheet to exact diameter with clean, burr-free edges

6. Inspection & packing — flatness, diameter, coating, and surface inspection; circles stacked with protective interleaving to prevent scratches

Key quality signals to look for: clean, burr-free edges; consistent coating thickness and color across the batch; flat, non-warped discs; and supplier documentation confirming the alloy grade and food-grade coating compliance.

Common Applications for Food-Grade Aluminium Circles

• Woks — deep-drawn Chinese-style woks and stir-fry pans

• Frying pans / skillets — including non-stick coated frying pans

• Stewing pans & saucepans — deep pots for soups, stews, and boiling

• Non-stick cookware — blanks ready for PTFE/ceramic non-stick topcoat application

• Baking & grill pans — lighter-gauge circles for bakeware and griddles

• Pressure cooker bodies — thicker circles for pressurized cooking vessels

• Transportation & road signs — food-grade circles also serve as durable sign blanks where required

Why Source Food-Grade Aluminium Circles from Dingang?

With 22+ years of aluminum processing experience, eight automatic roller coating lines, and an annual deep-processing capacity of over 20,000 tons, Dingang supplies food-grade color coated aluminium circles to cookware manufacturers across 100+ countries:

• Food-grade alloys AA1060/AA1100 — confirmed purity for food-contact safety and deep drawing

• Food-grade safety paint — compliant, heat-stable, oil/acid-resistant coating

• Custom diameters & thicknesses — 200–600mm standard (100–800mm available), 0.5–1.2mm

• Flexible tempers — O, H14, H26, and custom temper matching your tooling

• Clean, burr-free blanks — precise punching with protective interleaving for scratch-free delivery

• OEM / private label — custom sizes, colors, and packaging for cookware brands

• Fast lead times & global shipping — reliable supply for high-volume pan production