K28495 Automatic Breaking Point Apparatus


Test Method
Determines the breaking point of solid and semi-solid bitumens. A thin steel plaque is coated with the sample and flexed in a bending apparatus at descending temperatures until cracks appear in the sample coating.

Features and Benefits
• Conforms to IP 80 and related test specifications

• Allows user modification of test procedure for research or other applications

• Peltier cooling system

• Automatic clamp and adjusting of sample-coated steel plaque


K28495 Automatic Breaking Point Apparatus
The Automatic Breaking Point Apparatus tests bitumen samples according to the conventional Fraass Method and also allows the user to modify the testing procedure for research or other applications, such as determining the glass transition temperatures of various materials or performing a fatigue test. Utilizing Peltier cooling elements for the refrigeration of the test chamber, the unit requires only a light, auxiliary refrigerant for additional cooling down to –46°C (requires an external circulator) and avoids the use of a bulky and energy-consuming cryostat. The instrument features user-friendly operation. The sample-coated steel plaque is placed on the test support, and then the unit will automatically clamp and adjust the plaque and then determined whether the sample has been prepared properly in order to avoid any faulty measurements. In addition, a two-line alphanumeric display provides further instructions during a test.

In the Fraass Method routine, the instrument detects a distinct variation in the applied bending force or a typical deformation in the force/temperature curve. These striking force characteristics can even be recognized with difficult-to-measure materials such as polymer-modified bitumens, where ruptures of the sample coating cannot be observed visually. The initial bending force parameter indicates whether the sample has been prepared properly. For samples with a very low breaking point, a rapid cooling program cools the sample chamber at an initial accelerated rate and then decreased to the standard cooling rate during the actual test period. For samples where the estimated breaking point is unknown, the search mode program will determine an approximate breaking point by cooling the sample at a rate of 2°C/min and performing a bending test each minute. The instrument also offers the possibility to change and store test parameters, such as bending speed, cooling rate or bending intervals as separate user-defined programs. As an alternative to the Fraass Method, the Fatigue Method cools the sample to a specified temperature and then counts the number of repetitive bending strokes required to fatigue or crack the sample. This method requires the Breaking Point Windows® software for instrument operation and data evaluation, and the test results can be graphed in real-time.

Conforms to the specifications of: IP 80; DIN 52012; DIN EN 12593; NF T 66-026; JIS K2207

Included Accessories
Steel Test Plaques, pack of 10
Cleaning Brush

Dimensions lxwxh,in.(cm)
13x13.75x23.5 (33x35x60)
Net Weight: 26.5 lbs (12kg)

Shipping Information
Shipping Weight: 33 lbs (15kg)
Dimensions: 5 Cu. ft.

Ordering Information



Product Description

Electrical Requirements


Automatic Breaking Point Apparatus

230V 50Hz


Automatic Breaking Point Apparatus

230V 60Hz




Product Description


Breaking Point Windows® Software Package
Provides additional capability for instrument control and data manipulation. Needed to perform fatigue and glass transition temperature tests.


Sample Preparation Apparatus
Used for coating test plaques with bitumens having a softening point below 100°C. For samples with softening points above 100°C, please contact Koehler Customer Service for information.


Steel Test Plaques, pack of 10


Calibration Set