Oerlikon Tenax 88S HR description: TENAX 88S HR is a iron powder low-alloyed basic MMA electrode with low hydrogen content. Suitable for the welding of HYSS Higher yield strength steels: Yield strength <450MPa.BS 4360-55 e/f and e 450 EMZ. With a high impact energy (down to -60C) and fracture (CTOD) toughness in the as welded and stress relieved conditions. The TENAX 88S HR is used extensively in offshore oil and gas applications. 120% efficiency. Excellent operabillity, higher deposit.