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What a Plastic/Rubber MDS Should Include
Heidi M. Wittenborn
I just want to say one word to you. Just one wordâŚ
Plastics.
⢠The Graduate was 1967 â Plastics were the new wonder materials
⢠Today plastics are ubiquitous and found in everything from food packaging to âŚ
Know Your Polymer Classifications
⢠When creating or examining the MDS for a polymer based part check the material classification first
â Is it appropriate?
⢠Example: O-ring component is most likely to be an elastomer given the usual functional requirements of an o-ring
⢠Example: Molded hard plastic component is most likely a thermoplastic, filled or unfilled
⢠Recommendation 001A can help you determine the correct classification
Classifications
⢠5 Polymer Materials
â 5.1 Thermoplastics
⢠5.1.A Filled Thermoplastics
⢠5.1.B Unfilled Thermoplastics
â 5.2 Thermoplastic Elastomers
â 5.3 Elastomers/Elastomeric Compounds
â 5.4 Duromers
⢠5.4.1 Polyurethane
⢠5.4.2 Unsaturated Polyester
⢠5.4.3 Other Duromers
Classifications
⢠5 Polymer Materials (contâd)
â 5.5 Polymeric Compounds
⢠5.5.1 Plastics (In Polymeric Compounds)
⢠5.5.2 Textiles (In Polymeric Compounds)
Classifications
⢠6. Process Polymers
â 6.1 Lacquers
â 6.2 Adhesives, Sealants
â 6.3 Underseal
Classification 5.5.1
⢠5.5.1 Plastics (in polymeric compounds)
â Often used as a catch all even though it should not be
â More common in older MDSs
â Recommended that this classification not be used as there is almost always a more accurate classification available
Classification 5.5.2
⢠5.5.2 Textiles (in polymeric compounds)
â Sometimes used when nothing else seems to quite fit
â This is the type of material that it should be used for â rayon fibers caught in a PET matrix
Polymer Basics
⢠Should contain more than one substance
â A pure polymer is extremely rare and rarely used in automotive applications
⢠Additives modify polymer performance / appearance
â Fire resistance, Impact resistance, Flexibility, Elasticity, Color, UV resistance, etc.
Polymer Basics
⢠Not uncommon to have a polymer material made of sub-materials
â Example: Polymer sub-material + color master batch sub-material*
* Color master batches are sometimes classified as 7.3 because they contain so
little polymer that IMDS generates warnings if they are classified as polymers.
Remember â the 10% maximum rule for confidential + highly confidential doesnât apply at the sub-material level
Polymer Symbol as a Guide to Substances
⢠IMDS Recommendation 001 Rule 4.4.2.C.
âŚif the nomenclature for materials of a certain type is described in a public standard (example: ISO 1043-1 and 2 for plastics, ISO 1629 for elastomers or ISO 18064 for thermoplastic elastomers), then the material name according to this public standard must be enteredâŚ
⢠The symbol is the name for a polymer material
â Reject polymer materials in classifications 5.1, 5.2 and 5.3 if the symbol is not used as the name
â Can include additional information in () after the symbol name
Polymer Symbol as a Guide to Substances
⢠Building the symbol will help you be aware of what substances should be present or might be missing in a supplier submission
Symbol Complete
List base polymers
PP
Fillers added? Add
filler symbols
No
Yes
-GF30
Plasticizers added?
Add plasticizer symbols
No
Yes
-P(ELO)
Add flame retardant symbols
Flame retardants
added?
Yes
No
FR(52)
Symbol Construction â the Base Polymer(s)
⢠Base polymers
â Blends are listed in order from highest to lowest percentage with a plus sign between the symbols
⢠PC+PBT
â Laminates that cannot be easily separated are listed with the primarily visible polymer first followed by the others separated by commas
⢠PVC,PUR,ABS
â Up to four letters can be added to indicate modifications to the polymer using a hyphen
⢠PE-HD (for high density) PP
Symbol Construction â the Additives
⢠Fillers
â Indicated by âââ followed by the symbol for the filler
â 1st letter is the type of filler
â 2nd letter is the form of the filler
â Number is the percentage of the filler
⢠PP-MD30 for Polypropylene containing 30% by mass of mineral powder
â Multiple fillers are separated by a plus sign
⢠PP-(GF25+MD15)
PP -GF30
Symbol Construction â the Additives
⢠Plasticizers
â Indicated by ââPâ
â Specific plasticizer symbol in () after the -P
⢠PVC-P(ELO) for PVC containing Epoxidized Lineseed Oil as plasticizer
⢠For multiple plasticizers list them with a â+â sign in between
PP -GF30 -P(ELO)
Symbol Construction â the Additives
⢠Flame Retardants
â Indicated by FR
â Specific flame retardant number in () after the FR
⢠PP-FR(52) for Polypropylene with red phosphorus as a flame retardant
⢠For multiple flame retardants list them with a â+â sign in between
PP -GF30 -P(ELO) FR(52)
The Symbol vs. The Substances Listed
⢠17 - aromatic brominated compounds (excluding brominated diphenyl ether and biphenyls) in combination with antimony compounds
⢠Halogenated compounds include all flame retardants in group codes 10 - 29
Getting a Material MDS
⢠Always go back to the polymer manufacturer
â The vast majority are in IMDS and they are the only ones who really know what is in their products
â Some publish their MDSs, others submit directly upon request
Check Your Specifications
⢠What type of material does the drawing specify?
â Example: 40% Talc Reinforced, Polypropylene, Black
⢠MDS should have at least 3 substances listed â Talc
â Polypropylene
â Pigment for the black color
Know What is Reasonable
⢠Do the percentages for the substances in your polymer material make sense
⢠Amounts for additives can vary from less than 1% for flame retardants to as much as 10% or so for pigments
⢠Base polymer amounts vary depending on the type of polymer and its function â Example: PVC is used for many things from rigid pipes to flexible
wire insulation
â The formulation for PVC is dependent on its function
Âť Rigid â contains a high percentage of PVC
Âť Flexible â typically contains no more than 40 â 50% PVC
Polymeric Parts Marked Question
⢠Triggered whenever a component contains any amount of a polymer material
⢠Answer not always required
â IMDS checks do not produce warnings/errors when the amount of the polymer material is too light
â Failing to answer can cause rejection so always answer it
Questions?
Heidi M. Wittenborn
Senior Environmental Consultant
512-217-1675