ASTM C1651 Roll Wave Distortion measurement in Heat-Treated Flat Glass

The standard method ASTM C1651 measures roll wave optical distortion in Architectural Glass. The peak-to-valley depth and peak-to-peak distances can be used to determine roll wave distortion in flat, heat-treated architectural glass. Values in inch-pound units are used as standard.

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

Overview

ASTM C1651 provides a standardized method for measuring roll wave distortion in heat-treated flat glass. Roll wave distortion refers to periodic surface waviness caused during the tempering or heat-strengthening process, which can affect optical clarity and visual quality.

This test is essential for evaluating the surface profile and ensuring that distortion levels remain within acceptable limits. ASTM C1651 helps manufacturers maintain high-quality glass products by enabling accurate measurement and control of surface irregularities introduced during thermal processing.

Scope, Applications, and Benefits

Scope

ASTM C1651 specifies procedures for quantifying roll wave distortion in heat-treated flat glass using precise measurement techniques to evaluate surface irregularities.

Applicable to tempered and heat-strengthened flat glass
Measures periodic surface waviness (roll wave)
Evaluates optical distortion and surface quality
Includes standardized measurement intervals and locations
Ensures repeatable and accurate surface assessment
Supports quality control and product acceptance

Applications

Architectural and façade glass
Automotive glazing
Solar panel glass
Display and optical glass products
Quality control in glass manufacturing
Inspection of heat-treated glass surfaces

Benefits

Ensures high optical quality of glass
Detects surface distortion caused during processing
Supports compliance with visual quality standards
Improves manufacturing process control
Enhances customer satisfaction and product performance
Provides standardized and reliable measurements

Test Process

Specimen Placement

Position the glass specimen on a stable and level measurement platform.

Measurement Setup

Align measuring instruments along the glass surface in the rolling direction.

Profile Measurement

Record surface height variations across specified intervals.

Data Evaluation

Analyze measurements to quantify roll wave amplitude and spacing.

Technical Specifications

Parameter	Details
Material Type	Heat-treated flat glass
Distortion Type	Roll wave (periodic waviness)
Measurement Direction	Along glass rolling direction
Measurement Parameter	Wave amplitude and spacing
Specimen Condition	Clean and defect-free surface
Test Environment	Controlled ambient conditions
Output Result	Quantified roll wave distortion values

Instrumentation Used for Testing

Surface profilometer
Optical distortion measurement system
Straight edge or reference beam
Dial gauge or displacement sensors
Data acquisition system
Glass support platform

Results and Deliverables

Roll wave amplitude values
Wave spacing measurements
Surface distortion profile data
Optical quality assessment
Compliance with specification limits
Detailed inspection report with observations

Why Choose Infinita Lab for ASTM C1651?

Infinita Lab is a leading provider of ASTM C1651 and streamlined material testing services, addressing the critical challenges faced by emerging businesses and established enterprises. With access to a vast network of over 2,000+ accredited partner labs across the United States, Infinita Lab ensures rapid, accurate, and cost-effective testing solutions. The company’s unique value proposition includes comprehensive project management, confidentiality assurance, and seamless communication through a Single Point of Contact (SPOC) model. By eliminating inefficiencies in traditional material testing workflows, Infinita Lab accelerates research and development (R&D) processes.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

Frequently Asked Questions

ASTM C1651 is used to measure roll wave distortion in heat-treated flat glass by evaluating surface waviness. It helps ensure optical quality and detect distortions introduced during tempering or heat-strengthening processes, supporting quality control and product acceptance requirements.

Roll wave distortion is a periodic surface waviness formed during heat treatment due to roller contact. It affects the flatness and optical clarity of glass, making it important to measure and control for high-quality applications.

Measuring roll wave distortion is important because it directly impacts visual appearance and optical performance. Excessive distortion can cause visual defects, making the glass unsuitable for applications requiring clarity and precision.

Roll wave mainly affects optical performance and visual appearance, though excessive distortion can also influence structural behavior in some applications.

It enables manufacturers to monitor and control distortion, improve production processes, and deliver high-quality glass products that meet customer expectations and industry standards.