Petroleum · CAS Database
Hydrotreated Light Paraffinic Distillate
Hydrotreated Light Paraffinic Distillate (CAS 64742-52-5) — Refined base oil. Get the SDS and OSHA HazCom guidance you need to store, label, and handle it safely on the job site.
Verified vs OSHA sources · October 5, 2026
CAS Registry Number CAS 64742-52-5
Overview
Refined base oil
OSHA Exposure Limits
OSHA permissible exposure limit (PEL) and secondary limit for Hydrotreated Light Paraffinic Distillate on a US construction site. Where a substance-specific 1926 standard applies, its codified limit is shown; otherwise the figure comes from Table 1 to 29 CFR 1926.55, the construction air-contaminants table. Where 1926.55 does not list the substance, the Safety Data Sheet (Section 8) controls.
| Limit | Value | Basis / citation |
|---|---|---|
| OSHA PEL | See SDS §8 | 29 CFR 1926.55 Table 1 + SDS Section 8 |
| Action level | See SDS / standard | Not all substances define an action level |
| Averaging period | See SDS §8 | Compare with ACGIH TLV / NIOSH REL — often more protective than the OSHA PEL |
Many OSHA PELs date to 1971 and may be less protective than current ACGIH/NIOSH values; always check the manufacturer SDS (Section 8) for the controlling limit and engineering-control guidance. Not legal advice.
What actually governs this substance
Hydrotreated light paraffinic distillate is a refinery stream. Table Z-1 carries no row for it; the figure below comes from the generic "Petroleum distillates (Naphtha)(Rubber Solvent)" row, which prints no CAS number at all.
| Limit | Form | Source |
|---|---|---|
| 500 ppm | 8-hour TWA2000 mg/m³, via the generic Petroleum distillates (Naphtha) row | 29 CFR 1910.1000 Table Z-1Read-across: this CAS number is not itself named in the source entry — the limit is applied by analogy to the generic row. |
This is a UVCB — a substance of Unknown or Variable composition, Complex reaction product or Biological material. Refinery streams are defined by the process that made them and by a boiling range, not by a fixed formula, so aromatic content, benzene content and n-hexane content differ between suppliers. That is why no single GHS classification exists for it, and why two SDSs for the same CAS number can carry different pictograms.
Read the supplier's sheet for aromatic content and for benzene and n-hexane in particular: an aromatic stream and a hydrotreated aliphatic one behave very differently, and the generic 500 ppm says nothing about either.
OSHA & HazCom Compliance Requirements
For construction work, Hazard Communication is governed by 29 CFR 1926.59 (adopts 29 CFR 1910.1200). Employers who use Hydrotreated Light Paraffinic Distillate must:
- •Maintain an accessible SDS for Hydrotreated Light Paraffinic Distillate (readily accessible during each work shift, 29 CFR 1910.1200(g)(8))
- •Label all containers with GHS-compliant labels (29 CFR 1910.1200(f)(1) shipped / 29 CFR 1910.1200(f)(6) workplace)
- •Include it in the workplace chemical inventory
- •Train employees on hazards before initial assignment
- •Retain employee exposure and medical records per 29 CFR 1910.1020 — 30-year retention applies to exposure/medical records, not to SDSs generically
HazCom (1910.1200 / construction 1926.59) covers labels, SDSs, and training only — it does not impose chemical storage segregation. Flammable & combustible liquid storage for construction is 29 CFR 1926.152; segregation of incompatibles is planned from SDS Sections 7 and 10. Not legal advice; state-plan states may have stricter rules.
Handling & Secondary-Container Labeling
When you transfer Hydrotreated Light Paraffinic Distillate into a workplace (secondary) container, OSHA gives two compliant options under 29 CFR 1910.1200(f)(6):
- •(f)(6)(i): full GHS label elements (as on the shipped container)
- •(f)(6)(ii): product identifier + words/pictures/symbols (or combination) that provide AT LEAST general information on the hazards
There is no volume/size cutoff for secondary containers — the ≤100 ml / ≤3 ml accommodations (29 CFR 1910.1200(f)(12) (added by the HCS 2024 final rule)) apply only to the manufacturer's shipped container. A portable container filled for the immediate use of the worker who fills it needs no label (29 CFR 1910.1200(f)(8)).
GHS Hazard Classification under OSHA HCS
OSHA's Hazard Communication Standard adopts the GHS (primarily GHS Revision 7 (HCS 2024)). It requires 8 hazard pictograms (Appendix C, Figure C.1). The Environment pictogram (GHS09) is not required by OSHA — Not in App C; outside OSHA jurisdiction; voluntary.
The 8 OSHA-required pictograms:
For flammable liquids, OSHA classifies by flash point and boiling point (App B.6.1 / 1910.106(a)):
- •Category 1: FP < 73.4°F AND BP <= 95°F
- •Category 2: FP < 73.4°F AND BP > 95°F
- •Category 3: FP >= 73.4°F AND <= 140°F
- •Category 4: FP > 140°F AND <= 199.4°F
The specific GHS classification of Hydrotreated Light Paraffinic Distillate comes from its Safety Data Sheet (Section 2). Use the live classification panel above and the manufacturer SDS to confirm pictograms and categories.
HCS 2024 Update Deadlines
Under the Hazard Communication Standard 2024 update (aligned primarily GHS Revision 7):
- •May 19, 2026 — manufacturers, importers, and distributors update substance labels & SDSs (1910.1200(j)(2)(i))
- •November 20, 2026 — employers update workplace labeling, the written program & training (1910.1200(j)(2)(ii))
During the interim, parts may comply with the 2012 HCS, the 2024 HCS, or both.
Quick Actions
Put Hydrotreated Light Paraffinic Distillate on your written inventory, print the workplace label your containers need, and keep your supplier’s sheet reachable on the jobsite.
The safety data sheet for your product comes from the supplier who sold it to you — no public registry can provide it. For the underlying chemistry, the public record is on PubChem.
Where this fits in your HazCom program
- SDS management — collecting the sheet, keeping it current, and making it readable during each work shift.
- GHS labels & workplace labeling — what has to appear on the shipped container, and what a secondary container needs instead.
Free Compliance Tools for Hydrotreated Light Paraffinic Distillate
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Frequently Asked Questions
What is Hydrotreated Light Paraffinic Distillate (CAS 64742-52-5)?
Refined base oil
What are the OSHA HazCom requirements for Hydrotreated Light Paraffinic Distillate on a construction site?
For construction work, Hazard Communication is governed by 29 CFR 1926.59 (adopts 29 CFR 1910.1200). Employers who use Hydrotreated Light Paraffinic Distillate must maintain an accessible Safety Data Sheet (SDS), label containers with GHS-compliant labels, include the chemical in the workplace chemical inventory, and train workers on its hazards before initial assignment.
What is the OSHA permissible exposure limit (PEL) for Hydrotreated Light Paraffinic Distillate?
The applicable exposure limit (OSHA PEL, and where stricter, the ACGIH TLV or NIOSH REL) for Hydrotreated Light Paraffinic Distillate is listed in Section 8 of its Safety Data Sheet. OSHA construction air-contaminant limits are in Table 1 to 29 CFR 1926.55; many OSHA PELs predate current science, so an SDS may cite a more protective ACGIH/NIOSH value.
When does the updated HCS 2024 labeling apply to Hydrotreated Light Paraffinic Distillate?
Under the Hazard Communication Standard 2024 update (aligned primarily GHS Revision 7), chemical manufacturers, importers, and distributors must update substance labels and SDSs by May 19, 2026, and employers must update workplace labeling, the written program, and training for substances by November 20, 2026. During the interim, parties may comply with the 2012 HCS, the 2024 HCS, or both.
How do I label a secondary (workplace) container of Hydrotreated Light Paraffinic Distillate?
Under 29 CFR 1910.1200(f)(6) you have two options: (i) the full GHS label elements as on the shipped container, or (ii) the product identifier plus words, pictures, symbols, or a combination that provide at least general hazard information. There is no volume/size cutoff for secondary containers. A portable container filled for the immediate use of the worker who fills it does not require a label (29 CFR 1910.1200(f)(8)).
How long must SDS and exposure records for Hydrotreated Light Paraffinic Distillate be kept?
Under 29 CFR 1910.1020, 30-year retention applies to employee exposure and medical records (medical records: duration of employment plus 30 years) — not to SDSs generically. Where an SDS is not retained, a record of the chemical's identity, where it was used, and when must be kept for at least 30 years.
Where can I find the SDS for Hydrotreated Light Paraffinic Distillate?
Under 29 CFR 1910.1200(g)(6) and (g)(7), the manufacturer, importer or distributor that sold you Hydrotreated Light Paraffinic Distillate must send its Safety Data Sheet with the first shipment, and again with the first shipment after the sheet is updated. HazComFast keeps the sheets you collect in one inventory per jobsite, searchable by product, manufacturer or CAS number, and your jobsite's SDS load onto the phone on their own.
Sources & Primary References
Regulatory data on this page is sourced from HazComFast's verified regulatory module (29 CFR 1926.59 / 1910.1200 and substance-specific 1926 standards), last verified October 5, 2026 against eCFR, OSHA.gov, and the Federal Register. Physical-property data comes from PubChem. Confirm it against the manufacturer Safety Data Sheet. This page is informational and is not legal advice.
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