Buying Antioxidant 7PPD: What Matters
Antioxidant 7PPD (CAS 3081-01-4) is a liquid rubber antiozonant, and buying it well means getting the identity right, matching the specification to the compound, and securing the documentation that goes with a hazardous industrial chemical. This guide sets out what to check.
For the chemistry and applications behind these points, see our main article on antioxidant 7PPD (CAS 3081-01-4).
Step 1: Confirm the Identity
PPD antiozonants are easily confused, so identity is the first check.
| Substance | CAS | Alkyl group |
|---|---|---|
| 7PPD | 3081-01-4 | 1,4-Dimethylpentyl (C7) |
| 6PPD | 793-24-8 | 1,3-Dimethylbutyl (C6) |
Always confirm the CAS number and the alkyl group, and require the supplier to state whether the product is the pure homologue or a blend.
Step 2: Read the Specification
| Parameter | Why it matters | Typical value |
|---|---|---|
| Appearance | Confirms the expected liquid product | Dark brown viscous liquid |
| Active ingredient (HPLC) | Defines the useful content and dosing | ≥ 96% |
| Specific gravity (60/15 °C) | Affects volumetric dosing and consistency | 0.992–1.010 |
| Heating weight loss (70 °C) | Volatiles; cleanliness | ≤ 0.3% |
| Ash | Inorganic residue | ≤ 0.1% |
| Residue (100 mesh) | Absence of solid impurities | No granular impurities |
Step 3: Match the Form to Your Plant
- Liquid. The standard form, dosed by weight or volume into the mixer.
- Solution or pre-dispersed. Easier dosing in some continuous systems; confirm the carrier and the active content.
- Blends. Common in the PPD family; specify the composition and the active content rather than relying on a trade name.
Step 4: Secure the Documentation
As a hazardous industrial chemical, 7PPD must come with a complete documentation package:
- SDS in the required format and language, covering skin sensitisation and aquatic toxicity controls.
- COA per batch, reporting the active content and the specification parameters.
- Regulatory statements — REACH registration, TSCA and any market-specific requirements.
Supplier Checklist
- Identity. CAS 3081-01-4 and the correct alkyl group confirmed.
- Active content. Stated, and consistent batch to batch.
- Form and packaging. Liquid in drums or IBCs, matched to your dosing system.
- Documentation. SDS, per-batch COA and regulatory statements.
- Consistency. Recent batch history if colour or active content is critical.
- Handling. Closed-transfer arrangements and spill/waste guidance.
Common Buying Mistakes
- Accepting 6PPD as 7PPD. The two are different substances; buying on a generic “PPD antiozonant” label invites error.
- Ignoring active content. A lower-assay product needs higher dosing and may contain more inert material.
- Skipping documentation. For a hazardous chemical, the SDS and REACH/TSCA statements are not optional.
- Overlooking storage. Prolonged heat and air exposure darken and oxidise the product; rotate stock.
- Not re-validating on substitution. Switching between 6PPD and 7PPD can change compound performance and requires re-validation.
How PolyBlueChem Can Help
PolyBlueChem can supply antioxidant 7PPD (CAS 3081-01-4) as a bulk rubber-chemical raw material, with the documentation appropriate to your market. To request current specifications, a COA or a quotation, contact the PolyBlueChem team.
Frequently Asked Questions
What should I look for when buying 7PPD?
Confirm the CAS number (3081-01-4) and the alkyl group, check the active content and specification, match the form to your dosing system, and secure the SDS, per-batch COA and regulatory statements.
How do I avoid confusing 7PPD and 6PPD?
Buy on the CAS number and the chemical name, not on a generic “PPD antiozonant” description. 7PPD is 3081-01-4; 6PPD is 793-24-8.
What documents should come with a 7PPD shipment?
At minimum an SDS and a per-batch COA, plus REACH, TSCA or other market-specific statements as required.
What form is 7PPD supplied in?
Typically as a dark, viscous liquid in steel drums or IBCs; solution and blend forms are also available.
How should 7PPD be stored?
In sealed containers, cool and out of direct sunlight, and used in rotation to avoid darkening and oxidation over long storage.