A refined Materials Hazardous only in Bulk (MHB) corrosivity (CR) test has been developed which prescribes testing of representative samples of the cargo at conditions representing their as-shipped properties. The International Maritime Organization (IMO) formally published this interim guidance in January 2019 MSC.1/Circ.1600 Interim Guidance for Conducting the Refined MHB (CR) Corrosivity Test. AMSA have recently issued exemption EX5739 which allows shippers to use this guidance in the circular until 31 December 2022 when it is agreed and finalised in the 06-21 amendments to the IMSBC Code, considering the mandatory entry into force would be 1 January 2023.
AMSA have previously issued two exemptions also relating to corrosivity:
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The Australian Maritime Safety Authority (AMSA) have been working with industry on issues identified with the repeatability and reliability of the modified C.1 test prescribed by section 18.104.22.168.3 of the International Maritime Solid Bulk Cargoes Code (IMSBC Code).
AMSA have previously issued two exemptions, namely EX5450 (issued 19 December 2016) and EX5451 (issued 21 December 2016) in respect of assessing the corrosive properties of solid bulk cargoes. Both of these exemptions were valid until the 04-17 amendment to the IMSBC Code came into mandatory effect from 1 January 2019.
Issues relating to use of the C.1 test for assessing the corrosive properties of Solid Bulk Cargoes have been progressed at meetings of the sub-committee for the Carriage of Cargoes and Containers (CCC) at the International Maritime Organization (IMO). A refined Materials Hazardous only in Bulk (MHB) corrosivity (CR) test has been developed which prescribes testing of representative samples of the cargo at conditions representing their as-shipped properties. Amendments to be included in the 06-21 amendments to the IMSBC Code were finalised and agreed during CCC 5 in September 2018. These were sent to the Maritime Safety Committee (MSC) in December 2018 for that committee to issue an MSC circular. Until that circular can be formally published, allowing AMSA to permit use of it, and to allow shippers a period to transition to the contents of the circular once it is formally published, AMSA has issued two exemptions valid until the end of June 2019, to replace those previously issued as detailed below:
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 International Maritime Solid Bulk Cargoes Code. Incorporating Amendment 04-17 and Supplement, 2018 Edition.
The Australian Maritime Safety Authority (AMSA) has issued two recent exemptions in respect of assessing the corrosive properties of solid bulk cargoes.
AMSA issued EX5450 on the 19th of December 2016, which allows shippers of the following solid bulk cargoes
What does the exemption mean?
The exemption means that producers and shippers of the above listed cargoes may use the standard DIN 50 929 Part 3 as an alternative method to evaluate localised corrosion of these cargoes. The rate of uniform corrosion shall still be evaluated using the UN Manual of Tests and Criteria, part III, Section 37 Test C.1 and as prescribed in Section 22.214.171.124.3 in the IMSBC Code, inclusive of the 03-15 amendments. This exemption replaces previously issued EX5389 which is now revoked and was specifically for IRON ORE and IRON ORE FINES only.
EX5451 was issued on the 21st of December 2016 and allows shippers of the following solid bulk cargoes
What are the modifications?
The main change is the use of steel coupons only which are considered to be more representative of ships’ structures. Other notable amendments in the modified test are the sealing of the test container to prevent air exchange, a specified air to solids ratio and more prescriptive guidance on sample introduction and compaction within the test container.
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For further information for assessment of localised corrosion according to DIN 50 929 Part 3 (EX5450) or the modified Test C.1 (EX5451) or for any other maritime transport compliance query please contact Davoren Environmental firstname.lastname@example.org.
 Corrosion of metals; probability of corrosion of metallic materials when subject to corrosion from the outside; buried and underwater pipelines and structural components. September 1985.
The International Maritime Solid Bulk Cargoes (IMSBC Code) 2016 Edition - What's new with MHB classification and how it will impact shippers
The principal aim of the IMSBC Code is to enable the safe stowage and shipment of solid bulk cargoes by providing information on the dangers associated with the shipment of certain types of solid bulk cargoes and instructions on the practices and procedures to be followed when planning to ship solid bulk cargoes.
The IMSBC Code is subject to updates every two years to keep pace with the nature and variety of solid bulk cargoes presented for shipment, and developments in understanding regarding the safest ways to carry established solid bulk cargoes.
In June 2015, the IMO’s Maritime Safety Committee (MSC) adopted the most recent amendments Resolution MSC.393 (95) specifying forthcoming changes to the IMSBC Code. Amongst the adopted amendments (03-15) are included specific changes to Section 9 of the Code Material Hazardous only in Bulk (MHB).
According to the adopted amendments, where a cargo is found to meet one or more of the chemical hazards for MHB designation as defined below, a notational reference for each hazard must be included in the “Class" cell. A summary of the notational references to be used is presented below:
Summary of Notational References for Classification of Relevant MHB Hazards
Resolution MSC.393(95), incorporating amendment 03-15, may be applied from the 1st of January 2016 on a voluntary basis, anticipating its envisaged official entry into force on the 1st of January 2017.
* Where deviations from the chemical hazards described in 126.96.36.199 to 188.8.131.52 of IMSBC Code have been determined (Other hazards (OH)), they shall be properly recorded with justifications. Other hazards are to be included in the section for “hazard” in the individual schedule.
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