(A) concentration
The latex concentration is expressed in terms of total solids and dry gum content. Adhesive content refers to the latex rubber content, the total solids content refers to the latex in the removal of water and volatile components of all solid content, expressed as a percentage. The total solid content and dry content generally have a difference, this value is called the total dry difference, to illustrate the latex non-volatile non-rubber content. These indicators have important meanings for guiding production and product quality.
Fresh latex concentration varies with age, season, tapping system, generally only 20% -40% of the total solids content.
(B) the relative density
The relative density of fresh latex is between 0.96 and 0.98, which is determined by the relative density of whey (1.02) and the relative density of rubbery hydrocarbons (0.9064). The relative density of rubber latex can be approximated by the rubber content. The higher the content of rubbery hydrocarbons, the smaller the relative density of the latex, as shown in the table.
(C) viscosity
The total solids content of about 35% of the fresh latex viscosity of about 12-15mPa · s, with the collection period and other factors have a greater change. Generally high total solids, high viscosity, but the same total solids latex, due to storage methods, storage time, the size of the particles, the viscosity will be relatively different.
(D) Surface tension
The size of the surface tension indicates that the latex is evenly distributed on the surface of the solid --- so-called wetting performance. Rubber is insoluble in water, but the latex contains a large amount of surface-active substances that reduce the surface tension of water, such as proteins and fatty acids, which lower the surface tension of the latex. Such as the total solids content of 38% to 40% of the latex, the surface tension of about 38 ~ 40mN / m, far lower than the water (72mN / m), and thus hydrophilic surface such as cloth, leather and so wet and soaked Can often increase with the decrease of its surface tension. When the production of latex still can not meet the technical requirements, the need to add some surfactant to further improve the surface properties and increase the wettability.
(Five) PH value
The pH of the latex has a great influence on its stability. Fresh latex was neutral, slightly alkaline tendency, PH value of 7 to 7.2. After several hours to more than ten hours, due to the bacteria and enzymes in the latex, the pH decreases and becomes acidic, causing coagulation. To this end, often adding ammonia or other alkali, the PH value increased to 10 ~ 10.5, so that it can be preserved for a long time.

use
Mainly used in latex impregnated products: (weather, festivals, toys) balloon, (medical, household, industrial) gloves, pacifiers, condoms;
Sponge products: sponge (mattresses, pillows, shoes in the end pad);
Injection molding products: latex toys, gas masks, make-up appliances, footwear;
Other products include: adhesive, flocking, non-woven fabrics, carpets, textiles, paper making, adhesives and other applications: (wool, palm, animal and plant and synthetic fibers, artificial leather).