30 CFR § 35.4 - Types of hydraulic fluid for which certificates of approval may be granted.

---
identifier: "/us/cfr/t30/s35.4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 35.4 - Types of hydraulic fluid for which certificates of approval may be granted."
title_number: 30
title_name: "Mineral Resources"
section_number: "35.4"
section_name: "Types of hydraulic fluid for which certificates of approval may be granted."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "35"
part_name: "FIRE-RESISTANT HYDRAULIC FLUIDS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957, 961."
regulatory_source: "Schedule 30, 24 FR 10201, Dec. 17, 1959, unless otherwise noted."
cfr_part: "35"
---


# 35.4 Types of hydraulic fluid for which certificates of approval may be granted.

Certificates of approval will be granted for completely compounded or mixed fluids and not for individual ingredients; except that when a concentrate is submitted for testing, complete instructions for mixing with water or other vehicle shall be furnished to MSHA, together with the vehicle other than water, and the approval will cover only the specific mixture that constitutes the hydraulic fluid for use in coal mines.