Fused quartz and silica

FUSED QUARTZ

FUSED SILICA

Naturally occurring crystalline (sand) is crushed into powder
and passes through numerous purifying processes. The
resulting pure powder is fused by either of two different
processes to manufacture clear fused quartz ingots.

The manufacturing of this form of Silicon Dioxide does not
uses naturally occurring material but it is derived
synthetically. Hence the name synthetic quartz.

Electrically Fused

High energy electrical heating process melts (fuses)
the powder, casting very large ingots which will be cut
up during fabrication.

The result of this process is a fairly pure material. This
material has a very low Hydroxil (OH) content. It does
however contains some fine bubbles and minute
amount of other contaminants.

Currently this is the most widely used material in the
semiconductor industry. It is also used in some optical
applications where low cost and commercial grade
quality is acceptable.

Flame Fused

In this process particular chemicals are fused with
Oxygen - Hydrogen flame.

This material processing involves various drying
processes, thus numerous grades are available with
different OH content.

This material have excellent optical characteristic and
it is suitable for most optically critical applications
because the OH content effects the maximum
processing temperatures of the wafer substrate. This
parameter should be carefully evaluated.

Flame Fused

In this manufacturing process the powder is fused with
Oxygen - Hydrogen flame.

This clear fused quartz material is extremely pure and
virtually bubble free. However the OH content is
somewhat higher than the electric fused quartz.

This material is appropriate for almost all but the most
demanding optical applications.

Dry - Fused

This process to manufacture synthetic quartz is one of
the latest advancement in this technology.

This method produces the highest grade material to
date. The extremely low OH contents allows for high
processing temperatures.

The optical characteristics are of the highest grade.

Material

PROPERTIES of QUARTZ & SILICA

GE is the main manufacturer of fuzed quartz material. The material has a low OH content and is fairly pure with excellent
thermal properties. However is does contain some bubble and a minute amount of contaminants.

Tosoh, Schott are manufacturers of fused silica quartz material. The flame fused process has many grades OH content
which decreases its thermal properties compared to fuzed quartz. However the optical properties are excellent and has no
bubbles and contaminants.

Quartz Unlimited LLC
1181 South Rogers Circle, Suite 11
Boca Raton Florida 33487

Toll Free (888) 264-3879
Fax: (888) 264-3879
Main: (561) 999-4340
sales@qullc.com