Foreign investment in the production of bricks made of clay and tiles is only allowed only through joint venture with Cambodian-owned investors.
"Article 1: The following investment sectors shall be restricted on the basis of national security, social welfare, or economic needs as listed in the sensitive list for the opening of industries and for the granting of national treatment in the attached annex.
Annex 1 
[...] II. Industries Open with Restriction to Foreign Investors: Manufacture of non-structural non-refractory ceramic ware [Bricks made of clay (hollow, solid) and tile]: subject to local equity participation" (Sub-decree 80/ANK/BK on Measures Restricting Certain Investment Sectors, 27 August 1999, Art. 1 and Annex 1)
Sub-decree 80/ANK/BK on Measures Restricting Certain Investment Sectors, 27 August 1999, Art. 1 and Annex 1.
[<a href="https://www.wto.org/english/thewto_e/acc_e/khm_e/wtacckhm3a3_leg_4.pdf">Sub-decree</a>]