Designed for the extra stresses and strains associated with extended cruising and for saving weight on a long anchor rode by taking the opportunity to step down one size in chain.
Grade 70 chain is manufactured to such a high specification that it is possible to substitute e.g. 10mm Grade 40 anchor chain with a far longer length of 8mm Grade 70 without losing any strength.
MF DAMS High Strength Grade 70 Calibrated Anchor Chain with Enhanced Solid Zinc Hot Dip Galvanising
Jimmy Green Marine MF DAMS70 is sourced exclusively and directly from MF Catenificio Frigerio, a modern chain manufacturing plant in Italy.
MF Catenificio manufacturing is all carried out in their own research, test and ISO9001 attested production facility. The whole state of the art enterprise is located in Olginate, near Lecco, Lake Como, Italy.
Every link is proof tested during the production process as part of their quality control. The proof load testing process ensures that each individual weld has been completed successfully.
The original concept, design and production of increased strength Galvanised Anchor Chain is the brainchild of Corrado Maggi, lately of Maggi Catene, erstwhile top quality Italian chain manufacturers. Corrado has been instrumental in the development of DAMS Grade 70 for MF Catenificio. Corrado originally designed and developed a specially-engineered combined chemical and heat treatment to improve the tensile resistance of Grade 40 chain to high strength hot dip galvanised Grade 70 Anchor Chain. Note that the special part of this process is that the subsequent galvanising treatment which involves dipping the chain into molten zinc does not adversely affect the newly enhanced strength. Different manufacturers have tried to copy Corrado's formula, but it remains a trade secret which is now closely guarded by the design technicians at MF Catenificio.
MF Catenificio market their High Strength Grade 70 Chain as DAMS which stands for Downsizing Anchoring and Mooring System
MF DAMS High Strength Grade 70 Calibrated Anchor Chain Plus Factors - this is the Jimmy Green interpretation of the translations expressed in the MF catalogue:
Optimises the redistribution of weight onboard
Maximises possible chain length
Facilitates deep water anchoring
Optimises chain locker stowage
Requires less retrieval power
Smoothes the passage of the chain, both up and down
MF DAMS Grade 70 Calibrated Anchor Chain features enhanced Solid Zinc Galvanising treatment with greater micron depth and longer lasting corrosion resistance
MF have developed a Solid Zinc Galvanising treatment in conjunction with the standard hot dip galvanising process.
Solid Zinc Galvanising is an MF duplex treatment where both aspects of the process are hot dip molten zinc galvanisation.
The consolidated, faultless coverage, increased micron depth and improved fusion layer adhesion can extend the working life of the galvanising by up to 25%.
Solid Zinc Galvanising is proven to increase resistance to corrosion by up to 25% compared with standard galvanising.
The exterior finish generally has a more aesthetically pleasing, homogeneous chromatic appearance than standard hot dip galvanising.
However, even the Solid Zinc galvanising process is not infallible.
Flaws and blemishes can occur, but the deeper fusioning effect of the duplex treatment should provide reassurance.
Solid Zinc Features and Benefits:
Improved outer surface "Eta" Layer with 25% more zinc giving better protection to the next "Zeta" layer
Excellent galvanising coverage despite the awkward nature of the process experienced by all manufacturers with chain linkage.
Smooth, brilliant zinc finish with less blemishes than normal (chrome like appearance)
Reduced white oxidisation during its first exposure to the elements, due to longer lasting passivation
MF standard hot dip galvanising is normally to a minimum 80 microns, but the Solid Zinc process boosts that depth.
The enhanced coverage resulting from Solid Zinc Galvanising extends the effective protection against rust degradation in a marine environment.
N.B. All minimum micron thickness values are subject to variables and therefore dependent on the size of the chain, so micron depth figures are not specific.
This graph illustrates the relationship between the enhanced micron coverage of Solid Zinc Galvanising and the resistance to corrosion i.e. rust in terms of longevity/endurance in a marine environment.
The entire MF chain manufacturing process has Lloyds Register approval to the ultimate ISO 9001 quality standard: