Strength of two types of furniture connector in particle-board and MDF board

"Two types of connector used in construction of desks were evaluated for their ability to hold a particleboard (HMR and interior grade) and medium density fibreboard (MDF). So-called Director screws and Hafele Minifix Cam connectors were tested in pullout and flexure respectively, characteristic of the type of load sustained in service. Both 33mm and 16mm thick boards were compared for strength. Comparing between similar test conditins for 16mm thick boards, HMR boards carried the largest loads, then MDF, then interior grade particleboard with the smallest loads. Particleboard densities had the same ranking, but not MDF."--p. (ii).