Water Separability Testing Advice

Extreme care should be taken to use very clean, unscratched, un-etched glassware in this test method. Carefully examine the cylinder. Discard it if any sign of residue, etching or scratching is noted. Before using, the glassware should be checked for cleanliness by adding reagent water to the cylinder and inverting it to drain. If the water is drained by a smooth sheeting action and leaves behind no droplets, the glassware is clean for use.

Please visit the Lawler page for our Model 305 Water Separabilty Apparatus: http://www.LawlerCorp.com/d1401.html

D892 Foam Test - Ceramic or Metal Diffuser?

Although the method allows both a circular, Norton ceramic (stone) diffuser and a Mott cylindrical metal diffuser, there are advantages and disadvantages to each. The stone diffuser was used for many years before the introduction of the metal diffuser. Both need to meet certification requirements but the metal diffuser is much more uniform, easier to clean, and holds it specification for a much longer time than the stone diffuser. Based purely on the geometrical design, the circular stone diffuser produces larger bubbles, since the bubbles, as they are produced cling to the side of the stone and move upward. They then coalesce at the top of the stone thus forming larger bubbles. The larger bubbles cause the foam to break more easily, thus giving slightly better foam results.

Lawler makes several models of foam testing apparatus and diffuser certification apparatus. Learn more about them here: http://www.LawlerCorp.com/d892.html

Safe Lifting

Safe Lifting Suggestions:

• Squat down over the object to be lifted, keeping your back in a comfortable position without excessive bending of the spine


• Place your feet at shoulder width, or just beyond


• Keep the load close to your body, avoiding horizontal reaches greater than 16 inches. the further the weight moves from your body, the greater the effort needed to lift it.


• Use the large leg muscles for lifting


• Avoid twisting or bending from the waist and avoid jerking motions while lifting


• Do not rotate your upper body to move a lifted object without first shifting your feet in the direction you wish to move


• Do not attempt to lift a heavy object from the floor to shoulder level or above in one motion. rest it on a bench or other steady support at about waist level and change your grip to lift it higher

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Ergonomics and the Lawler Automated Pour Point Analyzer

Ergonomics is defined as an applied science concerned with the relationship between people and their work surroundings and work activities. It incorporates the designing of equipment, workstations, and tasks to fit the physical capabilities and comfort of the individuals performing the work. Improperly designed workstations and work positions can cause injury resulting in conditions ranging from:

• Temporary discomfort (aches and pains)
  


• Instantaneous injury (muscle pulls or strains), or



• Permanent physical illnesses referred to as cumulative trauma disorders (CTDs).

Temporary discomfort and instantaneous injury are often attributed to tasks involving heavy lifting or awkward body positions (crouching, stoopijng, crawling on hands and knees, etc.). CTDs, on the other hand are conditions caused over time by a combination of factors such as repetitive motion, forceful motion, porrt posture, vibration, and awkward movements. Age, gender, and physical attributes also play an important role. Tasks such as assembly line work, food processing, writing, and computer typing have been directly linked to CTDs.

If you are concerned about repetitive motion CTD injuries in your lab for manual pour point testing, then please consider the Lawler Automated Pour Point Analyzer. Our robotic arm replicates the ASTM D97 manual pour point motion. Follow this link to learn more: http://www.LawlerCorp.com/d97_auto.html

D2272 RPVOT Minimizing pressure fluctuations

The water that is added to the glass test vessel provides a stable peroxide content but does not greatly affect the oxidation process. It does minimize the pressure fluctuations in the induction phase of the test. A significant portion of the pressure increase is from the vapor pressure of water. The rise is approximately 50 psi at 150 deg C.