Information on the most widely used ASTM standards within the materials testing industry
Model: UT2064 ASTM D2137; ASTM D746; ISO 812; ISO 974
UT2064 Rubber low-temperature brittleness testing machine is to determine the highest temperature of vulcanized rubber under specified conditions when the sample is damaged by impact, that is, the brittle temperature, which can be used by non-rigid plastics and other elastic materials under low temperature conditions for comparative identification. It can determine the brittle temperature and low temperature performance of vulcanized rubber of different rubber materials or different formulations. Therefore, it is indispensable in terms of quality inspection of scientific research materials and their products, and control of production processes.
This instrument is designed according to ISO 974 plastic impact embrittlement temperature test method, ISO 812 international standard for determination of low-temperature brittleness of vulcanized rubber (single sample method), and is the latest developed compressor refrigeration equipment.
General Introduction
UT2064 Rubber low-temperature brittleness testing machine is to determine the highest temperature of vulcanized rubber under specified conditions when the sample is damaged by impact, that is, the brittle temperature, which can be used by non-rigid plastics and other elastic materials under low temperature conditions for comparative identification. It can determine the brittle temperature and low temperature performance of vulcanized rubber of different rubber materials or different formulations. Therefore, it is indispensable in terms of quality inspection of scientific research materials and their products, and control of production processes.
This instrument is designed according to ISO 974 plastic impact embrittlement temperature test method, ISO 812 international standard for determination of low-temperature brittleness of vulcanized rubber (single sample method), and is the latest developed compressor refrigeration equipment.

This equipment adopts cascade compressor refrigeration technology, using the principle of heat balance and circulating stirring to achieve automatic uniform cooling and constant temperature of the sample, which can fully meet the temperature control indicators stipulated by the national standard GB/T229-94. ISO 812; ISO 974. ASTM D 2137,ASTM D746
Key Features
1. Lifting clamp: The lifting clamp is composed of a cylinder with a clamp and a cylinder block. The distance from the impact part of the specimen to the lower end of the gripper is 11.0±0.5mm.
2. Impact device: The impact device is composed of an impact device and an impact cylinder.
3. Impactor: The weight of the impactor is 200±20g, and its working stroke is 40±1mm. When the impact cylinder is in the reset state, the distance from the end of the impactor to the specimen is 25±1mm.
4. Refrigeration medium: compressor refrigeration.
ISO 812:2017(en)
Rubber, vulcanized or thermoplastic — Determination of low-temperature brittleness
ISO 974:2000
Plastics — Determination of the brittleness temperature by impact
ASTM D2137-11(2018)
Standard Test Methods for Rubber Property—Brittleness Point of Flexible Polymers and Coated Fabrics
ASTM D746-24
Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact


Type of Impact Motion: The type of impact motion provided by the machine follow the A Strait-line motion, , with reference to the image from ISO 812 standards shared below.

Main parameters
| Model | UT2064 |
| Temperature control range | -70°C (compressor refrigeration) |
| Cooling speed | 0°C~-20°C about 1.2°C/min-20°C~-30°C, about 1.0°C/min-30°C~-60°C, about 0.7°C/min -60°C~-70°C, about 0.5°C/min |
| After constant temperature, the temperature fluctuation within 5min of the test | <±1 °C |
| Impact speed | 2m/s±0.2m/s |
| Sample numbers | Max. 10 pcs sample in one test |
| Option A1, For Rubber | |
| a) punch radius | 1.6±0.1mm |
| b) the gap between the impact head and the specimen holder | 6.4±0.3mm mm |
| c) The distance between the centerline of the impact head and the specimen holder | 8±0.3mm |
| Option A2, For Plastic | |
| Option A2.1, Method A | |
| a) punch radius | 1.6±0.1mm |
| b) jaw radius | 4.0±0.1mm |
| c) The gap between the punch centerline and the clamp | 3.6±0.1mm |
| d) The gap between the outside of the punch and the clamp | 2.0±0.1mm |
| Option A2.2, Method B | |
| a) punch radius | 1.6±0.1mm |
| b) The gap between the punch centerline and the clamp | 7.87±0.25mm |
| c) The gap between the outside of the punch and the clamp | 6.35±0.25 |
| Maximum dimensions | 720×700×1380mm (length× height × width) |
| Cold room size | 200×140×100mm |
| Cooling medium | 99.7% ethanol or other antifreeze |
| Stirring motor Power | 15W |
| Working power supply | 220V~240V, 50Hz 2Kw |
Standard
ASTM D2137: Standard Test Methods for Rubber Property--Brittleness Point of Flexible Polymers and Coated Fabrics
ASTM D2137 test method is used to evaluate the brittleness of rubber materials, or rubber coated fabrics, when exposed to low-temperature flex with an impact under specified conditions of striker speed. ASTM D2137 tests performed will be used to determine the lowest temperature at which rubber compounds will not show fractures or coating cracks when exposed to specified impact conditions.
ISO 812:2017 specifies a method for determining the lowest temperature at which rubber materials do not exhibit brittle failure or the temperature at which half of the test pieces used in a test fail when impacted under specified conditions.
The temperatures thus determined do not necessarily relate to the lowest temperature at which the material can be used since the brittleness will be affected by the conditions of test and especially by the rate of impact. Data obtained by this method are, therefore, intended to be used to predict the behaviour of rubbers at low temperatures only in applications in which the conditions of deformation are similar to those specified in the test.
ASTM D746: Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact
ASTM D746 test method establishes the temperature at which 50 % of the specimens tested would probably fail when subjected to the conditions specified herein. The test provides for the evaluation of long-time effects such as crystallization, or those effects that are introduced by low-temperature incompatibility of plasticizers in the material under test. Plastics and elastomers are used in many applications requiring low-temperature flexing with or without impact. Use data obtained by this method to predict the behavior of plastic and elastomeric materials at low temperatures only in applications in which the conditions of deformation are similar to those specified in this test method. This test method has been found useful for specification purposes, but does not necessarily measure the lowest temperature at which the material is suitable for use.
ISO 974 Plastics — Determination of the brittleness temperature by impact
Scope:
Brittleness temperature is the temperature at which 50% of the tested specimens exhibit brittle failure at specified impact conditions. It is utilized primarily for plastics and elastomers.
Test Procedure:
Specimens are secured in the customer specified specimen holder (A or B) with a torque wrench at 5 in-lb. The specimen holder is lowered into a bath at a specified temperature. The specimens are impacted at 2000 ± 200 mm/s and then examined. The procedure is repeated at a lower temperature until enough data is generated to determine a brittleness temperature. Brittle temperature is the temperature at which 50% of the specimens fail. Brittle failure is defined by ASTM D746 as fracture into 2 or more pieces, or any crack visible to the unaided eye. The specimens can be bent to an angle of 90° and examined for cracks at the bend.
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