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Table 4 Water CAs of treated stone surfaces measured in different time. The concentrations of nano SiO2 in 101S are 1.0 mg/mL for Marble and Qingshi, 1.5 mg/mL for Hedishi, respectively

From: Nano-materials enhanced protectants for natural stone surfaces

Surface

Time

Treated With 101S + nano SiO2

SCA (°)

ACA (°)

RCA (°)

HA (°)

Marble

Oct. 2020

165.4 ± 0.3

167.3 ± 1.4

153.9 ± 1.3

13.4

Jul. 2021

165.8 ± 0.3

168.3 ± 2.0

150.9 ± 6.3

17.4

Qingshi

Oct. 2020

166.2 ± 0.2

170.6 ± 0.5

150.9 ± 2.8

19.7

Jul. 2021

165.5 ± 0.3

170.1 ± 0.4

150.0 ± 3.5

20.1

Hedishi

Oct. 2020

169.6 ± 0.1

170.8 ± 0.2

155.3 ± 1.7

15.5

Jul. 2021

164.0 ± 1.5

166.9 ± 2.0

153.2 ± 3.5

13.8