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layout: default
title: Tri-ply Cookware Specification Template
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# Tri-ply Cookware Specification Template

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Use this template to define tri-ply stainless steel cookware requirements before requesting samples or quotations. Clear specifications help suppliers identify feasible construction, quote against the same product assumptions, and explain cost differences.

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## Technical Guide: Tri-Ply Construction Standards

When defining specifications for clad cookware, buyers should understand the engineering details of the metal bonding and fittings:

### 1. Cladding Structure Configurations
Multi-ply cookware bonds multiple layers of metal across the entire body (base and sides). Common configurations include:
* **Tri-Ply (3-Layer Clad - Standard):**
  * *Inner Cooking Surface:* Stainless Steel 304 (18/8 or 18/10) or Stainless Steel 316 (offering higher corrosion resistance against salt/acids).
  * *Core Layer:* Pure Aluminum (typically Al 1050) or Aluminum Alloy (Al 3003) for rapid and uniform heat distribution.
  * *Outer Induction Base:* Stainless Steel 430 (18/0 magnetic stainless steel) to enable induction cooktop compatibility.
* **Five-Ply (5-Layer Clad - Premium):**
  * *Structure:* SS304 (Interior) – Aluminum – Copper (or Aluminum Alloy) – Aluminum – SS430 (Exterior). This offers superior thermal retention and response but increases product weight and cost.

### 2. Thickness & Weight Guidelines
The total thickness of the bonded metal determines the cookware's warp-resistance and heat distribution:
* **2.0 mm to 2.4 mm (Mid-range):** Lightweight, heats up very quickly, but has higher risk of warping under high induction temperatures and may develop minor hot spots.
* **2.5 mm to 3.0 mm (Premium / Professional):** The **"Sweet Spot"** for high-quality cookware. It balances excellent thermal distribution, high warp-resistance, and comfortable handling weight.
* **Above 3.0 mm (Heavy-Duty):** Extreme durability and heat retention, but significantly heavier and more expensive.

### 3. Edge Finish & Corrosion Risks
Because the aluminum core is sandwiched between stainless steel, the rim treatment is critical:
* **Exposed Aluminum Edge (Cut Rim):** The aluminum core is visible at the rim. *Warning:* High-alkaline dishwasher detergents (high pH) can corrode/erode the exposed aluminum over time, leading to pitting and recessing at the edge.
* **Sealed/Rolled Edge (Closed Rim):** The stainless steel outer layers are rolled over to completely seal the aluminum core. This prevents dishwasher corrosion and protects the core, but requires specialized tooling and manufacturing.

### 4. Handle Attachment: Riveted vs. Welded
* **Riveted Handles:**
  * *Pros:* Extremely secure mechanical connection; virtually zero risk of sudden detachment.
  * *Cons:* Rivet heads protrude into the cooking surface, creating crevices where food particles, grease, and bacteria can accumulate; harder to clean.
* **Welded Handles:**
  * *Pros:* Interior cooking surface remains completely smooth and flat; highly hygienic and easy to wipe clean; modern aesthetic.
  * *Cons:* Requires highly precise, automated capacitor discharge welding and strict pull-force QC; poor welds can fail shear tests under heavy loads.

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## Project Information

| Field | Details |
| --- | --- |
| **Project Name** | `[e.g., Professional Culinary Series]` |
| **Buyer / Brand** | `[e.g., Goldensea / Sourced Brand Name]` |
| **Product Category** | `[e.g., Cookware Set / Frying Pan / Casserole]` |
| **Target Market** | `[e.g., United States (FDA) / Germany (LFGB)]` |
| **Sales Channel** | `[e.g., Specialty Retail / E-commerce (Shopify)]` |
| **Specification Date**| `[e.g., June 17, 2026]` |
| **Document Version** | `[e.g., v1.0]` |

---

## 1. Clad Structure Specifications

| Layer | Material Grade | Thickness Target | Material Specification / Standard |
| --- | --- | --- | --- |
| **Inner Layer** | `[e.g., SS304 (18/10 Stainless Steel)]` | `[e.g., 0.4 mm]` | `[e.g., Food-contact grade, ASTM standard]` |
| **Middle Core** | `[e.g., Pure Aluminum 1050]` | `[e.g., 1.5 mm]` | `[e.g., High-purity thermal conductor]` |
| **Outer Layer** | `[e.g., SS430 (Magnetic Stainless Steel)]`| `[e.g., 0.6 mm]` | `[e.g., Induction-ready, mirror finish]` |
| **Total Thickness** | | **`[e.g., 2.5 mm]`** | Target range (e.g., 2.5 mm $\pm 0.1$ mm) |

---

## 2. Product Assortment and Dimensional Targets

| SKU | Product Type | Inner Diameter | Wall Height | Capacity (L / QT) | Target Net Weight | Lid Included? |
| --- | --- | --- | --- | --- | --- | --- |
| **1** | `[e.g., Frypan]` | `[e.g., 24 cm / 9.5 in]` | `[e.g., 5.0 cm / 2.0 in]` | `[e.g., N/A]` | `[e.g., 0.95 kg]` | `[e.g., No Lid]` |
| **2** | `[e.g., Casserole]` | `[e.g., 20 cm / 7.9 in]` | `[e.g., 10.0 cm / 3.9 in]`| `[e.g., 3.0 L / 3.2 QT]` | `[e.g., 1.25 kg]` | `[e.g., Glass Lid]` |
| **3** | `[e.g., Saucepan]` | `[e.g., 16 cm / 6.3 in]` | `[e.g., 8.0 cm / 3.1 in]` | `[e.g., 1.5 L / 1.6 QT]` | `[e.g., 0.85 kg]` | `[e.g., Glass Lid]` |
| **4** | `[e.g., Stockpot]` | `[e.g., 24 cm / 9.5 in]` | `[e.g., 14.0 cm / 5.5 in]`| `[e.g., 6.0 L / 6.3 QT]` | `[e.g., 2.10 kg]` | `[e.g., SS Lid]` |

---

## 3. Shape, Rim, and Body Design

| Design Attribute | Specification / Requirement |
| --- | --- |
| **Body Shape** | `[e.g., Straight side with flared rim (pouring lip)]` |
| **Rim Finish** | `[ ] Sealed Closed Rim (Recommended)` <br>`[ ] Exposed Aluminum Cut Rim` <br>`[ ] Flared Pouring Rim` |
| **Interior Markings** | `[e.g., Laser-etched capacity marks in Liters and Quarts]` |
| **Stackability** | `[e.g., Standard nesting (saucepan fits inside casserole)]` |
| **Pouring Function** | `[e.g., Integral pouring rim around the entire edge]` |

---

## 4. Base and Cooking Compatibility

| Attribute | Requirement / Standard |
| --- | --- |
| **Induction Compatibility** | `[e.g., Required (Must pass strong magnet test)]` |
| **Stove Compatibility** | `[e.g., Gas, Electric, Ceramic, Induction]` |
| **Oven Compatibility** | `[e.g., Required (Target temp: 260°C / 500°F)]` |
| **Dishwasher Safe Claim** | `[e.g., Yes (Requires Sealed Rim)]` |
| **Base Flatness (Cold)** | `[e.g., Slight concavity of 0.2% of base diameter toward inside]` |
| **Bottom Branding** | `[e.g., Stamped logo HausRoland in the center]` |

---

## 5. Surface Finishes

| Area | Finish Specification | Notes / Reference Standards |
| --- | --- | --- |
| **Interior Cooking Surface** | `[e.g., Satin Brushed finish]` | Smooth surface, no polishing grease |
| **Exterior Body** | `[e.g., High Mirror Polish]` | Corrosion resistant |
| **Bottom Base** | `[e.g., Concentric Satin finish]` | Helps hide stovetop scratches |
| **Rim Border** | `[e.g., Polished smooth, zero burrs]` | Safe handling rim |
| **Brand Logo (Bottom)** | `[e.g., Mechanical Stamping (钢印)]` | Center placement |

---

## 6. Handle Specifications and Attachment

| Attribute | Specification |
| --- | --- |
| **Handle Type** | `[e.g., Long handle on frypan/saucepan, loop side handles on casserole]` |
| **Handle Material** | `[e.g., Cast Stainless Steel 201, hollow design for heat dissipation]` |
| **Handle Finish** | `[e.g., Brushed Satin finish]` |
| **Attachment Method** | `[ ] Riveted (Stainless Steel Rivets)` <br>`[ ] Welded (Smooth Interior)` |
| **Ergonomic Profile** | `[e.g., V-shaped long handle with flat thumb rest to prevent twisting]` |
| **Heat-Resistance Target**| `[e.g., Stay-cool handle (remains below 50°C during normal stove use)]` |
| **Hanging Hole** | `[e.g., Required on long handles]` |

---

## 7. Lid and Knob Specifications

| Attribute | Specification |
| --- | --- |
| **Lid Type** | `[e.g., Tempered dome glass lid with stainless steel rim]` |
| **Glass Specification** | `[e.g., High-durability tempered glass, thickness: 4.0 mm]` |
| **Lid Rim** | `[e.g., SS304 protective outer rim]` |
| **Steam Vent** | `[e.g., Required (1 steam release hole near edge)]` |
| **Knob / Handle Material** | `[e.g., Cast Stainless Steel knob with silicone insert]` |
| **Lid Fit Clearance** | `[e.g., Max lateral play: 1.5 mm]` |

---

## 8. Compliance, Testing, and Quality Standards

| Checkpoint | Requirement |
| --- | --- |
| **Target Market Regulations** | `[e.g., LFGB (Germany) / FDA (US)]` |
| **Acceptable Quality Limits** | Critical: **0.0** / Major: **2.5** / Minor: **4.0** |
| **Chemical Analysis (MTC)** | `[e.g., Steel Mill Test Certificate (MTC) required for each raw batch]` |
| **Testing Laboratories** | `[e.g., SGS / TUV / Intertek]` |
| **Pre-Shipment Inspection** | `[e.g., Final random inspection standard: ANSI/ASQ Z1.4]` |

---

## Revision History

| Version | Date | Description of Changes | Author |
| --- | --- | --- | --- |
| **v1.0** | `[e.g., June 17, 2026]` | Initial Release | `[e.g., Sourcing Manager]` |
| | | | |