ASTM D938 Congealing Point of Petroleum Waxes and Petrolatum

KN-938 Congealing Point of Petroleum Waxes and Petrolatum

Overview

   KN-938 Congealing Point of Petroleum Waxes and Petrolatum conforms to ASTM D938 Standard Test Method for Congealing Point of Petroleum Waxes, Including Petrolatum. Congealing point is a wax property that is of interest to many petroleum wax consumers. The procedure described here measures the temperature at which a sample being cooled develops a “set” or resistance to flow. At that temperature, the wax may be at or close to the solid state, or it may be semisolid and quite unctuous, depending on the composition of the wax or petrolatum being tested. In the case of petrolatums, congealing property is associated with the formation of a gel structure as the sample cools.

A sample of wax is melted and a droplet is made to adhere to the bulb of a thermometer. Using a prewarmed flask as an air jacket, the droplet on the bulb is allowed to cool at a fixed rate until it congeals. The congealing point is observed as the temperature at which the droplet ceases to flow as the thermometer is turned.

Application scope

1.       This test method is suitable for testing the freezing point of paraffin wax, including petrolatum.

2.       The inch/pound mentioned in this standard is regarded as a standard unit, and the value in parentheses is for reference only.

3.       This standard does not make recommendations for all related safety issues. Therefore, before using this standard, appropriate safety and health protection measures should be established and related systems and scope of application should be worked out.

Note 1: This method and D127 can choose one of them. The measured result is usually lower than the result obtained in D127-LP133, and the deviation varies with the type of petroleum wax.

Features

1.       Metal bath heating samples, safe, environmentally friendly, no open flame;

2.       The motor drives the sample to rotate in the horizontal axis direction to reduce human error;

3.       The rotation speed can be adjusted according to requirements;

4.       The blessing device can be operated very conveniently;

5.       Microcomputer temperature controller, PID adjustment temperature control, PT100 temperature sensor, high accuracy;

6.       Matching special thermometer and test tube plug;

Technical parameters

1.       Applicable standard: ASTM D938

2.       Heating method: metal bath heating

3.       Temperature control method: digital display PID temperature controller

4.       Rotation method: DC motor drive

5.       Rotation speed: 2.5s/r

6.       Power of the whole machine: 900W

7.       Working power supply: AC220V 50Hz