K25339 Copper Strip Tarnish Test Apparatus


Test Method
The Copper Strip Tarnish Test assesses the relative degree of corrosivity of petroleum products, including lubricating oils. A polished copper strip is immersed in 30mL of sample at elevated temperature. After the test period, the strip is examined for evidence of 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 D130, D6074, D6158 and related specifications

• Accommodates 16 test tubes

• Temperature range to 190C (374F)

• Microprocessor temperature control with digital display and overtemperature protection.


K25339 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 control 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.

The complete apparatus for the Copper Strip Tarnish Test for lubricating oils consists of:
Test Tube Bath
Copper Strips
Test Tubes
ASTM Copper Strip Corrosion Test Standard
Surface Preparation Accessories

Conforms to the specifications of: ASTM D130, D6074, D6158; FSPT DT-28-65; IP 154; ISO 2160; DIN 51759; FTM 791-5325; NF M 07-015

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


Vented Cork (16)




Catalog Number

Product Description


Copper Test Strips
12.5 x 1.5-3.0 x 75mm to ASTM specifications


Test Tube, 25x150mm


Viewing Test Tube
Protects copper strip during inspection or storage


ASTM Copper Strip Corrosion Standard
Colored reproductions of tarnished strips encased in a plastic plaque.


Silicone Carbide Paper, 240-grit. For polishing copper strips prior to testing. Package of 50 sheets.


Silicone Carbide Paper, 150-grit


Silicone Carbide Grain, 150-grit. For final polishing of copper strips prior to testing. 1 lb package.


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


Multi-Strip Polishing Vise. Similar to K25000 but capable of holding four strips at a time.


ASTM 12F Thermometer
Range: –5 to +215F


ASTM 12C Thermometer
Range: –20 to +102C


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.