Schott Borofloat 33 Wafers

Schott Borofloat® 33 is a high-quality borosilicate glass known for its outstanding properties, making it suitable for various applications. BF33 is Manufactured using the advanced Microfloat process. It is a transparent, colorless glass features excellent optical quality, a smooth surface, and high flatness.

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Brief Introduction

Borofloat 33 achieves a transmission rate exceeding 90% and has minimal fluorescence across the light spectrum. These qualities make it ideal for optics, optoelectronics, and photonics. Its low thermal expansion and high thermal shock resistance allow it to withstand temperatures up to 450°C, ensuring stability in temperature-sensitive applications.

This glass also resists water, acids, and alkalis, making it well-suited for the chemical industry and analytical technology. Notably, Borofloat33 is widely used in silicon wafer anodic bonding, providing excellent compatibility with silicon substrates for microelectronics and biotechnology.

CQT GROUP offers Schott BF 33 substrates in sizes ranging from 3 inches to 12 inches, meeting diverse industry needs.

Chemical composition
B2O3	13%
Na2O/K2O	4%
AI2O3	2%
SiO2	81%

Product Parameters

The general specs are as follows sheet, if your specified is not included with it, you may freely tell us and we’ll pleased to customize them for you.

spec	unit	4"	6"	8"	10"	12”
Diameter/size(or square)	mm	100	150	200	250	300
Tolerance (±)	mm	0.2	0.2	0.2	0.2	0.2
Thickness	mm	0.10 or more	0.30 or more	0.40 or more	0.50 or more	0.50 or more
Primary reference flat	mm	32.5	57.5	Semi-notch	Semi-notch	Semi-notch
LTV (5mmx5mm)	µm	< 0.5	< 0.5	< 0.5	< 0.5	< 0.5
TTV	µm	< 2	< 3	<3	<5	<5
Bow	µm	±20	±30	±40	±40	±40
Warp	µm	≤ 30	≤ 40	≤ 50	≤ 50	≤ 50
PLTV(5mm*5mm)<0.4um	%	≥95%	≥95%	≥95%	≥95%	≥95%
Edge Rounding	mm	Compliant with SEMI M1.2 Standard/refer to IEC62276
Surface Type		Single Side Polished /Double Sides Polished
Polished side Ra	nm	≤1
Back Side Criteria	µm	general 0.2-0.7 or customized