Table of Contents
- What is an IMDS Material Data Sheet?
- What are the main elements of an IMDS MDS?
- Component
- Semi-component
- Material
- Basic substance
- What information should an IMDS MDS contain?
- Product information
- Material information
- Substance information
- Supporting information
- What is homogeneous material in IMDS?
- How should material percentages be handled?
- What are the IMDS requirements for substance reporting?
- How does GADSL affect an MDS?
- What are IMDS MDS validation checks?
- 1. Structural validation
- 2. Data validation
- 3. Regulatory validation
- 4. Customer validation
- Common IMDS MDS errors
- Incorrect component structure
- Incorrect material classification
- Missing basic substances
- Incorrect percentages
- Weight discrepancies
- Incorrect regulatory information
- Incorrect recipient
- Outdated supplier data
- Over-reliance on system checks
- How should suppliers validate an MDS before submission?
- What happens if an MDS is rejected?
- IMDS MDS management across suppliers
- MDS changes and ongoing compliance
- IMDS MDS validation checklist
- Final takeaway
A Material Data Sheet (MDS) is the core data record used in IMDS to communicate the material and substance composition of automotive components.
For an MDS to support an acceptable IMDS submission, the data must accurately represent the supplied product, use the appropriate component and material structure, contain the required substance information, and satisfy applicable IMDS, regulatory and customer requirements.
The important point is that an MDS is not simply a form to complete. It is a structured representation of the material composition of a product.
What is an IMDS Material Data Sheet?
A Material Data Sheet, or MDS, contains structured information about a component, material or substance composition that is exchanged through IMDS.
Depending on the product, the MDS can represent:
- Components
- Semi-components
- Materials
- Basic substances
- Substance concentrations
- Material classifications
- Component and material weights
- Regulatory information
- Supplier information
- Recipient information
- Recycled or recyclate information where applicable
The MDS structure allows automotive customers to trace the reported substances through the product hierarchy.
For suppliers, this means the quality of the MDS depends on both the information entered and how that information is structured.
For the broader IMDS workflow, see our IMDS compliance guide for automotive manufacturers.
What are the main elements of an IMDS MDS?
An MDS can contain several levels of information.
Component
The component represents the supplied part or product being reported.
Examples might include:
- Electronic control units
- Connectors
- Cables
- Fasteners
- Plastic housings
- Sensors
- Mechanical assemblies
The component can contain lower-level components, semi-components or materials depending on its construction.
Semi-component
A semi-component represents an intermediate product that has not necessarily reached its final component form.
Examples can include:
- Wire
- Sheet
- Tubing
- Rolled material
- Extruded material
Whether a product should be represented as a component, semi-component or material depends on its physical form and the way it is supplied.
Material
Materials describe the composition of the material used within the component.
Examples include:
- Plastics
- Metals
- Elastomers
- Glass
- Ceramics
- Coatings
Material composition is important because the material is ultimately broken down into its constituent basic substances.
Basic substance
Basic substances represent the chemical substances that make up the reported material.
The substance level provides the information required for assessing applicable regulatory and customer requirements.
The relationship can therefore be represented broadly as:
Component - Material - Basic substances
More complex products can contain multiple levels:
Component - Component - Material - Basic substances
The structure should reflect the actual product rather than being created purely to satisfy an administrative workflow.
What information should an IMDS MDS contain?
The exact information depends on the product and customer requirements, but an MDS may need to include:
Product information
- Part number
- Component name
- Component description
- Supplier information
- Recipient information
Material information
- Material name
- Material classification
- Material weight
- Material composition
Substance information
- Basic substances
- Concentrations
- Applicable regulatory information
- Relevant declarable or restricted substances
Supporting information
Depending on the application and customer requirements, additional information may be necessary to support regulatory, recycling or customer-specific assessments.
The objective is to create a material record that is complete enough to support downstream compliance decisions.
What is homogeneous material in IMDS?
Homogeneous material is an important concept in IMDS because substance reporting and material assessment can depend on the composition of the individual material.
A component may contain several different homogeneous materials.
For example:
Electronic component
→ Plastic housing
→ Copper conductor
→ Solder
→ Coating
Each material can have a different chemical composition and therefore needs to be represented appropriately.
Do not assume that an entire component can always be treated as one material.
The material structure should correspond to the actual physical composition of the product.
How should material percentages be handled?
Material and substance percentages need to be consistent with the reported material structure.
For a material, the declared substances should represent its composition within the applicable reporting rules.
Common data problems include:
- Percentages that do not reconcile
- Missing substances
- Incorrect substance concentrations
- Incorrect material classifications
- Material weights that do not match the component structure
- Inconsistent information between supplier declarations and the MDS
These errors can affect downstream compliance assessments and may result in customer rejection.
This is why material-data validation should happen before the MDS is submitted.
What are the IMDS requirements for substance reporting?
Substance reporting is one of the most important parts of the MDS.
The supplier needs to determine which substances are present in the material and report them according to the applicable IMDS rules.
The review should consider:
- Substance identity
- Substance concentration
- Material classification
- Applicable regulatory information
- GADSL requirements
- Customer-specific requirements
- Confidential substance provisions where applicable
A supplier should not assume that passing a technical system check means the substance data is substantively correct.
The underlying composition still needs to be accurate.
How does GADSL affect an MDS?
GADSL—the Global Automotive Declarable Substance List—is widely used in automotive material reporting.
GADSL classifications help determine whether particular substances need to be declared within automotive material data.
However, GADSL should not be treated as the complete compliance assessment.
An automotive MDS may also need to be considered against:
- Applicable legislation
- ELV requirements
- REACH requirements
- Customer-specific requirements
- OEM substance restrictions
- Other applicable regulatory lists
The reporting status of a substance and its legal status are therefore not necessarily the same thing.
This distinction is important when validating MDS data.
What are IMDS MDS validation checks?
MDS validation should cover both technical completeness and substantive data quality.
A useful validation process can include four layers.
1. Structural validation
Check whether:
- The component hierarchy is correct
- Materials are attached to the correct components
- Semi-components are used appropriately
- Material classifications are correct
- Homogeneous materials are represented correctly
2. Data validation
Check:
- Material weights
- Component weights
- Substance percentages
- Missing substances
- Material composition
- Supplier information
- Part numbers
3. Regulatory validation
Check:
- GADSL-related declarations
- Applicable regulatory information
- Relevant restricted substances
- Customer-specific requirements
- Changes to applicable requirements
4. Customer validation
Check:
- Correct recipient
- Customer request
- OEM-specific rules
- Required information
- Submission requirements
- Customer deadlines
This layered approach is more reliable than relying on a single automated check.
Common IMDS MDS errors
Incorrect component structure
The MDS hierarchy does not accurately represent the supplied product.
Incorrect material classification
A material is assigned to the wrong material category.
Missing basic substances
The material composition is incomplete.
Incorrect percentages
Substance concentrations do not accurately represent the material.
Weight discrepancies
Component, material and substance-level information does not reconcile.
Incorrect regulatory information
Required regulatory information is missing or incorrectly entered.
Incorrect recipient
The MDS is submitted to the wrong organization or customer.
Outdated supplier data
The supplier's declaration no longer reflects the current product or material.
Over-reliance on system checks
The MDS passes an automated check but still contains inaccurate material information.
These problems are why IMDS data quality needs to be treated as an ongoing process rather than a final checkbox.
For a deeper look at recurring problems, see IMDS data quality problems in automotive material declarations.
How should suppliers validate an MDS before submission?
A practical pre-submission review can follow this sequence:
1. Confirm the part
Verify the part number, description and customer.
2. Confirm the product structure
Make sure the component, semi-component and material hierarchy reflects the actual product.
3. Verify material information
Check material classifications, weights and composition.
4. Verify substance information
Check substance identity, percentages and required declarations.
5. Review GADSL and regulatory information
Identify applicable declarable or restricted substances and confirm the required information has been entered.
6. Review customer requirements
Check OEM-specific requirements before submission.
7. Run validation checks
Identify structural, data and regulatory errors.
8. Resolve exceptions
Correct missing or inconsistent information.
9. Submit
Send the MDS to the correct recipient.
10. Retain the submission record
Maintain the information needed to demonstrate what was submitted and how exceptions were resolved.
What happens if an MDS is rejected?
An MDS rejection should be treated as a data-quality issue that requires investigation.
The process should be:
The correction should address the underlying problem.
For example, if a material declaration received from a supplier is incomplete, simply modifying the final MDS may resolve one submission but leave the source data incorrect for other products.
A better process identifies the supplier data problem and corrects the underlying record.
This creates a more reusable compliance dataset.
IMDS MDS management across suppliers
The MDS is only as reliable as the data feeding it.
For manufacturers managing complex supply chains, the workflow can involve:
The challenge increases when material information is collected from hundreds or thousands of suppliers.
Teams may need to track:
- Supplier responses
- Missing material information
- MDS requests
- Validation exceptions
- Rejected submissions
- Corrections
- Resubmissions
- Approval status
- Material changes
This is why IMDS data management is closely connected to supplier data collection.
For the upstream challenge, see our guide on getting FMD data without repeatedly chasing suppliers.
MDS changes and ongoing compliance
An approved MDS should not automatically be considered permanently valid.
Changes to the underlying product or material can require the data to be reviewed.
Potential triggers include:
- Supplier changes
- Material substitutions
- Manufacturing changes
- Component redesign
- New regulatory requirements
- GADSL changes
- Customer requirement changes
The key question is:
Does the change affect the material data or the compliance status of the product?
If it does, the relevant MDS should be identified, reviewed and updated through the appropriate customer process.
IMDS MDS validation checklist
Before submitting an MDS, verify:
Final takeaway
An IMDS MDS is a structured representation of the materials and substances contained in an automotive product.
A reliable MDS process therefore requires more than completing mandatory fields.
It requires:
Accurate material data + correct product structure + complete substance information + regulatory checks + customer requirements + pre-submission validation
When those elements are controlled, suppliers can reduce avoidable rejections and manufacturers can build a more reliable material compliance dataset.
For the complete IMDS workflow, see the IMDS compliance guide for automotive manufacturers.