ASTM C738 Test for Lead and Cadmium Extracted from Glazed Ceramic Surfaces

ASTM C738 is used to determine the amount of lead and cadmium extracted by acetic acid from glazed ceramic surfaces. The values stated in SI units are to be regarded as standard.

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ASTM C738 Test for Lead and Cadmium Extracted from Glazed Ceramic Surfaces

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C738 determines the amount of lead and cadmium that can be extracted from glazed ceramic surfaces under controlled conditions. The test evaluates the potential release of these toxic elements when ceramic products come into contact with food or liquids.

This method is widely used in tableware, cookware, and consumer ceramics industries. It ensures compliance with safety regulations and helps protect human health by limiting exposure to hazardous metals.

Scope, Applications, and Benefits

Scope

ASTM C738 evaluates the leaching behavior of lead and cadmium from glazed ceramic surfaces by exposing them to an acidic solution. The test measures the concentration of extracted metals.

The test evaluates:

Lead release from ceramic glaze
Cadmium release from ceramic glaze
Compliance with safety standards
Surface stability under acidic exposure
Suitability for food-contact applications

Applications

Ceramic tableware and dinnerware
Food-contact ceramic products
Glazed cookware and kitchenware
Decorative ceramics
Consumer household products
Regulatory compliance testing

Benefits

Ensures consumer safety and regulatory compliance
Detects hazardous metal leaching
Supports product certification and approval
Assists in glaze formulation improvement
Enables comparison of material safety

Test Process

Sample Preparation

Glazed ceramic specimens are cleaned and prepared.

Acid Extraction

Samples are exposed to a controlled acidic solution (e.g., acetic acid).

Exposure Period

Specimens are maintained under specified time and temperature conditions.

Data Recording & Evaluation

Extracted solution is analyzed for lead and cadmium content.

Technical Specifications

Parameter	Details
Applicable Materials	Glazed ceramic surfaces
Extraction Solution	~4% acetic acid
Test Temperature	~20°C to 25°C
Exposure Time	~24 hours
Detection Limit	~0.1 mg/L
Measured Outputs	Lead and cadmium concentration (mg/L)

Instrumentation Used for Testing

Atomic absorption spectrometer (AAS) or ICP-OES
Chemical-resistant containers
Acid solution preparation setup
Temperature control system
Sample handling tools
Data acquisition system

Results and Deliverables

Lead concentration values (mg/L)
Cadmium concentration values (mg/L)
Compliance evaluation with safety limits
Surface leaching assessment
Test condition summary
ASTM compliance report

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Frequently Asked Questions

ASTM C738 measures the amount of lead and cadmium extracted from glazed ceramic surfaces. It evaluates potential leaching into food or liquids, ensuring safety of ceramic products used in food contact applications.

Key parameters include extraction solution type, exposure time, temperature, and surface area of the specimen. Controlled conditions ensure accurate measurement of metal release from glazed surfaces.

The test determines concentrations of lead and cadmium released, typically reported in mg/L. Results indicate compliance with safety regulations and suitability for food-contact use.

ASTM C738 is used for glazed ceramic products such as tableware, cookware, and decorative items that may come into contact with food or beverages.

ASTM C738 uses controlled extraction conditions and may not fully represent real usage scenarios with varying food types, temperatures, or repeated use affecting metal leaching behavior.