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Table 3 Water CAs of treated stone surfaces measured in different time. The concentrations of nano Al2O3 in 101S are 1.0 mg/mL for Marble and Hedishi, 1.5 mg/mL for Qingshi, respectively

From: Nano-materials enhanced protectants for natural stone surfaces

Surface

Time

Treated With 101S + nano Al2O3

SCA (°)

ACA (°)

RCA (°)

HA (°)

Marble

Oct. 2020

168.9 ± 1.5

170.7 ± 0.3

156.6 ± 0.9

14.1

Jul. 2021

165.6 ± 0.8

170.0 ± 0.3

154.3 ± 2.3

15.7

Qingshi

Oct. 2020

165.0 ± 1.3

169.2 ± 1.4

153.1 ± 0.5

16.1

Jul. 2021

165.4 ± 0.7

169.2 ± 1.4

148.1 ± 2.5

21.4

Hedishi

Oct. 2020

165.6 ± 0.1

169.7 ± 0.7

153.0 ± 1.1

16.7

Jul. 2021

165.7 ± 0.5

170.0 ± 0.9

149.2 ± 4.8

21.0