General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal container with gypsum (possible) investment compound.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

18.5 cm

Width

13.2 cm

Height

26.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Medical Technology

Category

Dentistry

Sub-Category

N/A

Manufacturer

AKA

Kerr

Country

United States of America

State/Province

Michigan

City

Detroit

Context

Country

United States of America

State/Province

Vermont

Period

Unknown

Canada

Unknown

Function

Used to mold and cast models and dies.

Technical

Part of a collection of chemicals and equipment used in the manufacture of dental fillings, moulds, bridgework and inlays.

Area Notes

Unknown

Details

Markings

Printed on the proper front and proper back: "KERR/ REG. U.S. PAT. OFF./ CRISTOBALITE/ INVESTMENT/ U.S.A. PATENT No. 1,932,202/ for INLAYS/ This Investment has sufficient expansion to/ compensate for all shrinkages of gold and wax/ encountered in casting inlays./ Manufactured in U.S.A. by/ KERR DENTAL MFG. COMPANY/ DETROIT, MICH., U.S.A./ 10 lbs. Net/ 4.54 Kg. Net"/ Printed on the proper left side: "ADVANTAGES OF/ KERR/ REG. U.S. PAT. OFF./ CRISTOBALITE/ INVESTMENT/ REG. U.S. PAT. OFF./ for INLAYS/ Cristobalite Inlay Investment obtains its ex-/ pansion from its principal ingredient Cristo-/ balite, a distinct form of silica having a/ higher expansion than any other form. This/ expansion makes it possible to produce well/ fitting inlays without recourse to wax expan-/ sion, hot water, thick mixes, or complicated/ techniques./ A single mix is used, burn-out/ may be accomplished quite rapidly and the/ Investment has adequate strength. Any/ technique may be used, but the Philips'/ Control Technique is highly recommended./ Read Enclosed Directions"/ Printed on the proper right: "PHYSICAL PROPERTIES OF/ KERR/ U.S. PAT. OFF./ CRISTOBALITE/ INVESTMENT/ U.S. PAT. OFF./ for INLAYS/ Guaranteed to meet the American Dental/ Associated Specifications No. 2 for Inlay/ Investment./ WATER-POWDER RATION: 38-42 parts of water/ to 100 parts of In-/ vestment by weight./ SETTING EXPANSION: 0.36%/ CRUSHING STRENGTH: 1500 lbs. per sq. in./ SETTING TIME: Vicat Needle - 13 Min./ Gilmore Needle -/ Initial 15 Min. - Final 22 Min./ THERMAL EXPANSION:/ 700-900 [degrees] Fahr./ 370-480 [degrees] Cent. - 1.20 %/ 1200-1800 [degrees] Fahr./ 650-980 [degrees Cent. - 1.25%"

Missing

Unknown

Finish

A brown paper covered can with black printed text and a grey metal top and bottom.

Decoration

N/A