Absorption and permeation of water and aqueous solutions of high-temperature vulcanized silicone rubber

Property Failure of Silicone Rubber Caused by Silicone Grease Absorption

“…The silicone grease absorption of the SiR under tensile stress/strain was investigated using the tension device that we used in our previous work [9]. The SiR sample has a free length, width, and thickness of 100, 18, and 2 mm, respectively.…”

Investigation of electrical, tracking/erosion, and water absorption resistance properties of ATH-SiO2-reinforced RTV-SiR composites for high-voltage insulations

“…It can be seen from Figure 12 that compared to neat SiR specimens, the individual ATH- and SiO 2 -filled composites showed higher mass uptake, which primarily increased and then decreased irrespective of filler type and concentration. Wang et al 17 also noticed the same absorption behavior in high-temperature vulcanized–SiR-blends filled with hydrophilic fillers. Among all investigated specimens, the improved immersion resistance was exhibited by ATH–SiO 2 co-filled blends (D and E), which may be due to stronger Van der Waal’s forces, lower free volume, and preexisting voids in polymer matrix.…”

“…13 Recently, numerous researchers have studied thermal degradation and resistance to tracking/erosion of SiR composites. [14][15][16][17][18][19][20][21][22][23][24][25][26] Du and Xu 14 reported that material degradation depends on leakage current (LC) magnitude and arc mobility. Likewise, the enhancement in tracking and erosion resistance has been noticed for SiR composites at lower weight percent of SiO 2 particles.…”

“…16 Due to the poor electrical, thermal, erosion/tracking, and water immersion properties, pure SiR cannot be used as the outdoor flexible insulants. 17 Water, moisture, and fluids can penetrate into weather-sheds and sheath of the polymer insulator. As a consequence, it causes siloxane chains hydrolysis, fillers decomposition, interface breakdown between polymer matrix and filler particles, increase in LC, and decrease in dielectric strength.…”

Effect of mineral oil on flashover voltage of HTV silicone rubber under AC corona ageing: from the view of trap level distribution

“…Many studies investigated the effect of liquid intrusion on the electrical and mechanical properties of HTV silicone rubber. Wang et al [5, 6] found that the infiltration of water would increase the dielectric constant, the polarisation current of HTV silicone rubber, and would reduce the volume resistivity and breakdown field strength. They also found the infiltration of NaCl solution and HNO 3 solution would affect the electrical performance of HTV silicone rubber.…”