Related Rule
South Africa
Practice Relating to Rule 79. Weapons Primarily Injuring by Non-Detectable Fragments
South Africa’s LOAC Manual (1996) states: “Weapons which are calculated to cause unnecessary suffering are illegal per se. Such weapons include … weapons filled with glass.” 
South Africa, Presentation on the South African Approach to International Humanitarian Law, Appendix A, Chapter 4: International Humanitarian Law (The Law of Armed Conflict), National Defence Force, 1996, § 34(f)(i).
South Africa’s Revised Civic Education Manual (2004) states:
iv. Convention on Certain Conventional Weapons (CCW Convention). This convention was adopted on 21 Dec 2001 and endeavours to prohibit or restrict the use of certain conventional weapons which may be deemed to be excessively injurious or to have indiscriminate effects. The Convention is a collection of four Protocols:
(1) Protocol I: Protocol on Non-detectable Fragments. It is prohibited to use any weapon the primary effect of which is to injure by fragments, which, in the human body, escape detection by X-rays. 
South Africa, Revised Civic Education Manual, South African National Defence Force, 2004, Chapter 4, § 56(f)(iv).