ASTM C1651

ASTM C1651 – Standard Test Method for Measurement of Roll Wave Optical Distortion in Heat-Treated Flat Glass

Description:

Significance and Use

5.1 This test method is a procedure for determining the peak-to-valley depth and the wavelength of roll wave in flat glass and then calculating the optical distortion resulting from that roll wave. Peak-to-valley measurements provide a means of monitoring the roll wave distortion in a heat processed glass product.

5.2 Measured peak-to-valley depth provides information required by some specifiers of heat-treated glass products.

5.3 Roll wave is inherent in flat glass which has been heat treated in a furnace in which rollers are used to convey the glass.

5.4 Consult Specifications C1036 and C1048 for additional glass characteristics and quality information.

Scope

1.1 This test method is applicable to the determination of the peak-to-valley depth and peak-to-peak distances of the out-of-plane deformation referred to as roll wave which occurs in flat, heat-treated architectural glass substrates processed in a heat processing continuous or oscillating conveyance oven.

1.2 This test method does not address other flatness issues like edge kink, ream, pocket distortion, bow, or other distortions outside of roll wave as defined in this test method.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.