FYI for whomever is interested this is the reply I received from Rocna.
Thank you for your enquiry and comments.
Glad to hear you are pleased with your Rocna.
Rocna anchors have been manufactured in three different countries (New Zealand, Canada
, and China). Following extensive evaluations and testing we moved our production to a Chinese manufacturing facility in 2009. We partnered with a well-respected manufacturer in Shanghai, who produce Rocna anchors in their ISO-9001 accredited facility. We also have our own in-country staff who work
closely with the factory and provide independent audits as part of our comprehensive quality assurance program.
In addition we have formed a long-term relationship with Italian based RINA (Registro Italiano Navale), an internationally recognized leader in certification
and assessment of conformity, who have also been actively involved in our quality assurance program.
The exact materials used are part of the proprietary intellectual property involved in our production specifications, and grades of steel are carefully chosen to ensure they exceed the RINA Super High Holding Power (SHHP) requirements by a considerable margin, as mentioned above.
While our manufacturing material specifications have evolved over time, primarily to reflect the material locally available in the different countries where our anchors have been produced, our technical website content had remained largely unchanged. This oversight has recently been brought to our attention and we apologize for any confusion this may have caused. We have now updated this website content accordingly.
All Rocna anchors are designed to meet or exceed the requirements of SHHP according to RINA and Lloyds rules, and our relationship with RINA has resulted in Type Approval classification to SHHP (currently Rocna Original sizes 4kg-110kg only – you can see our certificate http://www.rocna.com/assets/Uploads/Rocna-RINA-Cert.pdf
. This involved extensive seabed tests, mechanical tests, and drawings approval, and our work
with RINA continues.
production anchors were recently tested and found to withstand forces well in excess of six times the SHHP proof load requirements. This load also exceeds the breaking strength of the recommended G40 chain by a considerable margin, clearly demonstrating the significant factor of safety
in our design.
For a period of time during the first quarter of 2010, the shanks of some Rocna anchors were manufactured with steel sourced from a different supplier than usual.
While this steel had been approved on the understanding that it was of the same specification as that used previously, we recently discovered that this was not the case and that some anchors were produced using shank steel with a reduced specification. We stress that only a limited number of anchors were affected and at the same time we are deeply sorry for this mistake and apologise for any concern this may have created. Since discovering this discrepancy, our primary concern has been to ensure that these particular anchors are undeniably fit for purpose and pose no safety
With this in mind we engaged a number of professional independent organizations to undertake extensive evaluations and testing. This has been a comprehensive and time-consuming process that is now complete. The results are:
· Our current
production anchors were independently load tested using the RINA Super High Holding Power (SHHP) Type Approval test methodology. SHHP is the highest anchor rating available.
· Due to the unavailability of any of the limited number of anchors produced with the alternate material, we engaged a highly reputable marine
engineering consulting company to calculate the maximum load capability of these anchors.
· The model developed predicted the load capability of the current production anchors within 1% of the demonstrated value, validating the accuracy of the model.
· The model then calculated a load capability for the alternate specification anchors of 471% of the RINA SHHP Proof Load requirements.
· This load capability exceeds the breaking point of the recommended G40 chain rode
by a considerable margin.
These results confirm that all Rocna anchors, including those produced with alternate material, exceed RINA’s proof load requirements by a significant margin, clearly demonstrating the significant factor of safety in our design.
If you have any further queries please do not hesitate to contact us.
t:+64 9 4471961/f: +64 9 480 9576
Copy of my email to Rocna follows
I purchased a Rocna 33 kg anchor through Geoff at Waikawa Marine Rigging
in 2010. I am extremely pleased with the anchors performance with our Alden 54 Mithrandir. I have also posted this message to websites. I have a simple question. Everyone has heard about the issue of some of your anchors rusting because they were made in China
from less than optimum materials. What is your version and should I be concerned.