Original Assignee Union Starch and Refining Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US101073A Inventor Patel Chim Ronald E Pyle Current Assignee (The listed assignees may be inaccurate. Google Patents High viscosity starches using stannic chlorideĭownload PDF Info Publication number US3117892A US3117892A US101073A US10107361A US3117892A US 3117892 A US3117892 A US 3117892A US 101073 A US101073 A US 101073A US 10107361 A US10107361 A US 10107361A US 3117892 A US3117892 A US 3117892A Authority US United States Prior art keywords starch viscosity stannic chloride chloride slurry Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3117892A - High viscosity starches using stannic chloride honey).US3117892A - High viscosity starches using stannic chloride

Remember, flux is the source of that sticky tack property.Ī high viscosity fluid generally equates to a high tack (i.e. The tack decreases as metal load increases because there is less flux present. What does this higher metal load do to the tack? More metal in the paste means it's harder to stir. A higher metal load equates to a higher viscosity. Viscosity is going up, but tack is going down.Ĭonsider the metal load of a solder paste, or the weight percent of alloy in the flux vehicle. The solder paste also dries out and becomes less tacky. Over a period of days or weeks, the solder paste hardens and becomes extremely viscous. The difference between these two properties is apparent when you leave a jar of solder paste sitting out. Examples of tacky materials are tape, glue, gum that has been chewed, and also honey. Tack is the stickiness of a flux or its ability to hold components.

It has units of (force x time)/area or SI units of . Examples of viscous materials are honey, peanut butter, and yogurt. Viscosity is the resistance of a flux to flow or the internal friction of a flux. Typically, this is the case, but not always. People often “tack” them together as one, thinking they go hand-in-hand. Viscosity and tack are two important material properties that define a flux.

SiP & Heterogeneous Integration & Assembly (HIA).

The Indium Corporation & Macartney Family Foundation.

Test for high viscosity paste