K25330 Copper Strip Tarnish Test Apparatus


Test Method
Measures the tendency of lubricating grease to corrode copper under static conditions. A polished copper strip is immersed in a sample of grease at elevated temperature for a specified period. The strip is examined for corrosion and a classification number from 1-4 is assigned based on a comparison with the ASTM Copper Strip Corrosion Standards.

Features and Benefits
• Conforms to ASTM D4048 specifications


K25330 Copper Strip Tarnish Test Apparatus
Constant temperature bath immerses 16 test tubes for copper strip tarnish tests of products not requiring a test bomb. Microprocessor temperature controller has C/F switchable digital setpoint and display. Operator and equipment are protected by an overtemperature control circuit which automatically interrupts power to the unit should bath temperature exceed a programmed cut-off point. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information. Welded stainless steel double-wall construction with built-in support rack. Fully insulated.

Conforms to the specifications of: ASTM D4048, FTM 791-5309

Capacity: 16 test tubes

Maximum Temperature: 190C (374F)

Temperature Control Stability: 1C (2F)

Heater Range: 0-750W

Bath Medium: 5 gal (18.9L) water or high temperature heater transfer fluid

Electrical Requirements
115V 50/60Hz, Single Phase, 7.5A
220-240V 50/60Hz, Single Phase, 4A

Dimensions Ixwxh,in.(cm)
15.5x12.5x14 (39x32x36)
Net Weight: 27 Ibs (12.2kg)

Shipping Information
Shipping Weight: 45 Ibs (20.4kg)
Dimensions: 12.8 Cu. ft.

Ordering Information



Product Description

Electrical Requirements


Copper Strip Corrosion Test Tube Bath

115V 50/60Hz


Copper Strip Corrosion Test Tube Bath

220-240V 50/60Hz



Catalog Number

Product Description


Test Jar Rack
Inserts in K25330/K25339 baths to hold sixteen 332-004-004 Test Jars


Test Jar


Copper Test Strip
Conforming to ASTM specifications


Silicone Carbide Paper, 150 grit
For polishing of test strips. Pack of 50 sheets.


Silicone Carbide Paper, 240 Grit
For polishing of test strips. Pack of 50 sheets.


Silicone Carbide Grain, 150 Grit
For final polishing of test strips. 1 lb package.


Polishing Vise
Holds copper strip firmly in place without marring the edges. Stainless steel, mounted on a composition base.


ASTM Copper Corrosion Standards
Colored reproductions of tarnished strips encased in plastic.


Viewing Test Tube
Protects copper strip during inspection or storage.


ASTM 130F Thermometer
Range: 20 to 220F


ASTM 130C Thermometer
Range: –7 to +105C


When inquiring about NIST traceable certified thermometers, please refer to the catalog number for the corresponding thermometer and replace the middle three zeros in the catalog number with 004. Example: 251-000-01C ASTM 1C Thermometer would be 251-004-01C ASTM 1C Certified Thermometer.