Hebei Hankai high temperature o ring kit

A typical rotary shaft seal consists of several key components a flexible sealing lip, a rigid outer casing, and sometimes a spring mechanism to enhance the sealing effect. The sealing lip is made from elastomeric materials, which allow it to maintain flexibility while adapting to the surface of the rotating shaft. The outer casing is usually made from metal or hard plastics, which ensures a secure fit within the housing or bore.

- Dust Seals These seals act as the first line of defense against external contaminants. They are located outside the cylinder and help keep dirt and debris from entering the hydraulic system.

- O-Ring Seals Circular in shape, O-rings are widely used due to their simplicity and effectiveness. They can accommodate a range of applications and are often used in low-pressure systems.

In an early study Jani et al. administred rutile TiO₂ (500 nm) as a 0.1 ml of 2.5 % w/v suspension (12.5 mg/kg BW) to female Sprague Dawley rats, by oral gavage daily for 10 days and detected presence of particles in all the major gut associated lymphoid tissue as well as in distant organs such as the liver, spleen, lung and peritoneal tissue, but not in heart and kidney. The distribution and toxicity of nano- (25 nm, 80 nm) and submicron-sized (155 nm) TiO₂ particles were evaluated in mice administered a large, single, oral dosing (5 g/kg BW) by gavage. In the animals that were sacrificed two weeks later, ICP-MS analysis showed that the particles were retained mainly in liver, spleen, kidney, and lung tissues, indicating that they can be transported to other tissues and organs after uptake by the gastrointestinal tract. Interestingly, although an extremely high dose was administrated, no acute toxicity was observed. In groups exposed to 80 nm and 155 nm particles, histopathological changes were observed in the liver, kidney and in the brain. The biochemical serum parameters also indicated liver, kidney and cardiovascular damage and were higher in mice treated with nano-sized (25 or 80 nm) TiO₂ compared to submicron-sized (155 nm) TiO₂. However, the main weaknesses of this study are the use of extremely high single dose and insufficient characterisation of the particles.

Titanium dioxide nanoparticles have also been found in human placentae and in infant meconium, indicating its ability to be transferred from mother to fetus.