Whip Mix FireLite Specifications download pdf (Page 6)

Whip Mix Investments are divided

into two categories according to their

bonding systems: Phosphate and

Gypsum. Within these systems you

will nd a wide variety of investments

for general purposes, as well as for

specic uses and techniques.

Individual descriptions herein will

enable you to choose those best

tting your requirements.

Phosphate investments are especially

intended for use with high-fusing

precious and non-precious alloys as

they will withstand burnout as high as

1,000° C/1,800° F. They possess

high strength and high expansion.

A special liquid is used with most of

these investments to help impart

these qualities, as well as to enable

the user to vary the expansions for

different alloys by proper dilution with

water.

Gypsum investments, because of

their temp erature limitation, are

restricted to use with metal alloys in

the low-fusing range below 1,080°

C/1,975° F. Some gypsum investments

may be used hygroscopically, others

with a high heat burnout of 650°

C/1,200° F maximum and a few with

either technique.

Physical Properties

This latest edition of the Whip Mix

Products Directory provides detailed

Physical Properties for our many

investments. Use them as a guide in

selecting the material most appropriate

for your needs.

ISO 9694 for phosphate investments

requires that all testing be done

according to manufacturer’s

recommended mixing directions. This

is how the properties listed here have

been determined. Phosphate

investments may vary widely in their

handling properties due to variations

in temperature, humidity, mixing time,

mixing equipment and investment

age. The physical properties reported

are typical, recorded from samples

prepared from mixes at 27° C/80° F

when mixed under slow-speed mixing.

Gypsum investments are covered by

ISO 7490, whose tests have been

used to determine their physical

properties. It should be noted that

specication tests are principally for

conformance and uniformity, and the

gures listed, especially for expansion,

do not necessarily predict the actual

compensation (casting t) obtainable.

Whip Mix uses its own performance

test to ensure reliability in actual use.

Some investments of a more

specialized nature, such as Jewelry

Investment, the Soldering Investments,

etc., are not covered by any

ISO

Specication.

Following is a brief list of the Physical

Properties:

Consistency

The ratio of water (or special liquid) in

milliliters per 100 grams of powder.

The gures listed are generally

recommended for practical use; the

individual product brochure indicates

how more or less liquid affects the

casting t.

Working Time

These gures denote the actual time

available for handling the material

after spatulation and before it thickens

and becomes unusable. The range in

values is dependent on investment

age, temperature, mixing time, etc.

Ready for Burnout

The minimum time the investment

should be allowed to set before

burnout is started.

Setting Expansion

The relatively free expansion in air as

determined by the ISO method. It

does not reect the restraint imposed

by the casting ring, impression

material, etc.

Hygroscopic Expansion

Determined by the ISO method, it is

the investment’s expansion under

water. The water is maintained at 38°

C/100° F and the specimen is

submerged immediately after investing.

Thermal Expansion

ISO method determination of the

effective expansion of the investment

when raised to the temperature

shown.

Compressive Strength

The ‘green’ strength of the investment

is determined after the material has

set for one or two hours at room

temperature and 100% relative

humidity.

Warning

Phosphate investments are

incompatible with gypsum materials.

Even a small amount of investment

can seriously retard or prevent the

setting of gypsum materials. Therefore,

a separate bowl should be used to

mix phosphate investments.

Properties of investments are subject

to change due to moisture absorption

and abrupt temperature changes.

They should be stored in a dry, cool

place, preferably at room temperature.

Containers should be kept sealed at

all times.

Investment packed in bulk quantities

should not be overstocked; a

reasonable stock would be a six

months’ supply. However, the

preweighed envelopes extend this

period considerably because of the

moisture-proof properties of the

envelope.

All Whip Mix investment cartons bear

two dates: one is the month, day and

year of manufacture and the other is

the warranted shelf life of the

material. Whip Mix investments all

have a two-year shelf life.

Whip Mix Investments

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