How much calcium carbonate do you need to brush your teeth every day?

The basic function of toothpaste is to clean the teeth, and this effect is mainly achieved by abrasives , which account for 40% to 50% of the toothpaste formulation.

Four types of abrasives commonly used internationally are calcium hydrogen phosphate, silicon dioxide, calcium carbonate, and aluminum hydroxide.

The use of calcium hydrogen phosphate and silica in the American toothpaste formula accounts for 97%. In China, most of them use calcium carbonate . The heavy calcium carbonate has strong friction and the light calcium carbonate has a small specific gravity, which is the main reason for making ordinary grade B products. raw material. China's calcium carbonate resources are abundant, the quality is acceptable, and the cost of producing toothpaste is low, which is suitable for the current consumption level in China.

Basic formula for toothpaste

According to statistics, adults use about 1.5 grams of toothpaste every time to brush their teeth, brush twice a day, and consume 3 grams of toothpaste. The calcium carbonate content is 45%, and the daily brushing cost consumes 1.35 grams of calcium carbonate .

The population of China is calculated at 1.383 billion. The people of the country spend 1867.5 tons of calcium carbonate every day. ( Of course, the friction agent in toothpaste is not necessarily calcium carbonate, and some people do not brush their teeth every day. This is only a rough estimate ).

(1) Hardness

When brushing your teeth, the pressure of the toothbrush is used to press the abrasive into the soft scale, plaque and calculus to break the dirt. The ideal toothpaste abrasive should be less hard, but it can get rid of contaminated plaque.

The hardness of calcite is 3, the enamel is 4 to 5, and the cementum and dentin are 2 to 2.5. More than 80% of adults in China have gingival recession and neck exposure, which requires the use of more delicate and soft abrasives.

(2) particle size

The size of the abrasive particles has a large impact on product functionality, safety and appearance. When the particle size is 30um or more, there will be a grit feeling in the oral cavity. The average particle size of the abrasives accepted by consumers is 3-12um .

In addition to particle size, particle size distribution and uniformity are also important indicators of abrasives. The toothpaste with suitable particle size is smooth and delicate, and the mouthfeel is comfortable; when the particle size is too fine (such as less than 1um), the toothpaste holder will have a coarse phenomenon, that is, the fine abrasive particles will flocculate due to the Brownian motion.

(3) particle shape

The crystal particles of calcium carbonate are mostly square diamond-shaped, mostly acute angles less than 90°, and the surface damage is strong and scratched when rubbed.

(4) Solubility

The abrasive is insoluble in water, which is an important indicator of its chemical stability. In recent years, since toothpastes have been used with therapeutically active active substances, and it is required that the abrasive as a main component has higher chemical inertness, it is possible to formulate a stable product.

Calcium carbonate for toothpaste includes light calcium carbonate, heavy calcium carbonate and natural calcium carbonate . The technical specifications are as follows:

â–½GB/T 23957-2009 Lightweight calcium carbonate index requirements for toothpaste industry


â–½HG/T 4528-2013 Heavy calcium carbonate index requirements for toothpaste

â–½QB/T 2317-2012 Oral cleaning care products, natural calcium carbonate for toothpaste

Cermic Ball Bearing

The full ceramic ball bearings listed below are supplied with rings and balls made from zirconium dioxide (ZrO2). These zirconia bearings are available as full complement (no cage) or with cages made from PTFE, PEEK or 316 stainless steel.

These are non magnetic, non-conductive and highly corrosion resistant to most chemicals although ZrO2 bearings are not recommended for prolonged contact with steam. Full complement bearings or those with a 316 stainless cage can be used up to 400°C while bearings with a PEEK or PTFE cage can cope with temperatures of up to 250°C. For temperatures below -70°C, PTFE or 316 stainless steel cages are preferred. Standard radial clearance for full ceramic bearings is C0 but other clearances can be supplied to order.

ZrO2 ceramic bearings are generally used for their extreme temperature capabilities, excellent corrosion resistance or non-magnetic properties. Other sizes can be supplied on request.

The Description of Ceramic Bearings:



Compared to steel, Ceramic ball Bearings have many specific advantages. They offer superior corrosion and heat resistance, higher dimensional stability, and lower density, which facilitate high speed. Ceramics are superior to steel in heat and corrosion resistance, and are lightweight and extremely hard as well. Consequently, ceramic rolling bearings can be used in environments where conventional steel bearings cannot. That is to say, the superiority of these bearings makes it possible that they can be applied in some special environments.

Firstly, they can be used in corrosive environments. Compared to stainless steel bearings, hybrid and all Ceramic Bearing lasted three and twenty times longer respectively. It is presumed that water readily adheres to silicon nitride and forms a better lubrication film, leading to extended bearing life.

Secondly, they can be performed in corrosive agents. Generally, silicon nitride has excellent corrosion resistance. However, corrosion resistance varies depending on the type and quantity of sintering additives, and certain corrosive agents decrease in hardness and flexural strength. In such situation, it is can be proved that the carbide-based ceramic bearings are the most effective.

Thirdly, they can be used in high-temperature vacuum. An all-silicon nitride Ball Bearing with a self-lubricating laminated cage (mainly composed of MoS2) and with MoS2-coated rings and balls proved superior in durability in a high-temperature vacuum environment. Compared with the hybrid bearings, the all-ceramic bearing was superior in both dynamic frictional torque and life.

Fourthly, they can be performed with poor lubrication. As ceramics are extremely hard and have outstanding wear resistance, they outperform other materials in bearing life without lubrication. According to a test, the steel bearing seized within a short period while the hybrid and all 627 Ceramic Bearings, though sustaining wear, did not. And the all-ceramic bearing sustained considerably less wear than the hybrid bearing, indicating that its endurance life is much longer.

Cermic Ball Bearing,Full Ceramic Bearing,Hybrid Ceramic Bearing,Self-Aligning Full Ceramic Ball Bearing

Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearing.com