Test Methods: ASTM D665, NACE TM-01-72 (Automated)
Rusting Characteristics of Oils
• Fully conforms to ASTM D665 and NACE TM-01-72 Methods
• Automated Operation Liberates Operator for Other Duties
• Reduces Operator Errors
• Improved Precision
• Liquid Bath or Liquid Free Bath
• Operation Parameters Adjustable via Color Touch Panel
• Stirrers Agitating at Precisely 1000 rpm, ±0 rpm
• Stirrers Adjustable from 0 to 1100 rpm
• Temperature Range 40° to 150°C
• Temperature Stability of ±0.1°C
Click for Manual Apparatus
Click for Rust Bath with Individually Controlled Test Positions

Model 391-6 is an agitated liquid bath with 6 test positions conforming to ASTM D665 and related tests. The bath is in all respects the same as Model 390-6 manual apparatus, but with the addition of timing features that make it an automated apparatus. Operator timing errors are thus reduced and the data precision is improved.

Sequence of bath operation:
The operator adds 30 mL of water into each of the 6 reservoirs above each of the beakers.

The operator prepares and inserts the beakers (with test oil, covers, and stirrers) into the bath as per ASTM D665 method. The test rod assembly (includes the steel rod and holder) are mounted on a holding rack above the individual beakers.

The stirrers and the timer are started.

From this point and until the completion of the test the operator is no longer involved.

When the test oil temperature reaches 60°C (as detected by one PT100 temperature probe inserted into one of the test beakers), the steel rod holding rack is automatically lowered such that the steel specimens are inserted into test oil as per ASTM D665.

After 30 minutes of agitation, the 30 mL of water is automatically released into the beakers.

After 4 hours of agitation the holding rack with the steel test rods are automatically raised from the beakers, the stirrers are stopped and an alarm alerts the operator. The timers are reset for the next test.

The steel rods are now ready for visual rating of rusting.

Model 391-4 is identical to Model 391-6 but configured for only 4 test positions.

Model 397-6 is a 6 position heated tube bath (liquid free) also available with same automation features as Model 391-6. This dry heated bath removes the disadvantages of liquid baths, such as smoke, fire hazard, cleanliness, safety, etc.

Available Models
Part No.
Automated Liquid Bath for Rust Testing, 4 positions. D665, NACE (specify)*
Automated Liquid Bath for Rust Testing, 6 positions. D665, NACE (specify)*
Automated Individually Heated Tube Bath for Rust Testing. 4 positions. D665, NACE (specify)*
Automated Individually Heated Tube Bath for Rust Testing. 6 positions. D665, NACE (specify)*
*  Inquire for other alternate automated tests

Part No.
Polishing device with chuck (115 Volts) 
Polishing device with chuck (230 Volts) 
Holding chuck (for polishing test specimen. Spare)
400 mL beaker for D665, D3603, D5534, each
400 mL beaker for NACE test, each
Beaker cover (PMMA) for D665, NACE, each
Beaker cover (PMMA) for Lawler D665, NACE Automatic Units, each
Beaker cover (PTFE) for D665, each for Procedure C (heavier than water fluids)
Beaker cover (PTFE) for Lawler D665 Automatic Units, each for Procedure C
Steel test specimen for D665, NACE, each
Plastic holder (PMMA) for D665, NACE specimen, each
Teflon holder (PTFE) for D665 specimen, each
Clear plastic stirrers' shield for 4 position baths
Clear plastic stirrers' shield for 6 position baths
NACE Air purging system of electrical enclosure with differential pressure gauge & remote air blower for reduced fire danger – NOT Certified Explosion proof
Paddle and Shaft, D665, NACE. Spare
Auxiliary Stirrer Blade for ASTM D665 Procedure C (heavier than water fluids)
Silicon carbide paper 240-grit (50 sheets)
Silicon carbide paper 150-grit (50 sheets)
Silicon carbide cloth, J-weight 100-grit for NACE (50 cloths)

Specifications subject to change without notice.

Specifications subject to change without notice. Lawler Manufacturing Corporation © 2011