<img alt="" src="https://secure.hims1nice.com/150891.png" style="display:none;">
The Hill and Griffith Company
1085 Summer Street - Cincinnati, OH 45204


Hydraulic Circulating Oils

Hill and Griffith's PREMIER R&O Hydraulic Circulating Oils were specifically designed for all but the most severe high pressure applications, where high oxidation resistance and a maximum amount of water separation is necessitated.

The PREMIER R&O series is formulated with the highest quality base stocks and incorporates both rust and oxidation inhibitors as well as a metal passivator and defoamant additive. These products are ideally suited in circulating systems such as steam turbines and air compressors where maximum demulsibility of water from the oil is required. They do not contain anti-wear additives based on their application.

Product Name: PREMIER R&O 32 PREMIER R&O 46 PREMIER R&O 68
ASTM Grade 150 215 315
Cincinnati Milacron Spec P-38 P-55 P-54
Military Spec Equivalent MIL-H 46001 A MIL-H 46001 A MIL-H 46001 A
API Gravity 31.2 29.8 29.4
Viscosity, SUS @ 100F 162 227 340
Viscosity, SUS @ 210F 44 48 55
Viscosity, cSt @ 40C 31.8 44.4 66.2
Viscosity, cSt @ 100C 5.3 6.5 8.4
Viscosity Index, minimum 95 95 95
Pour Point, degrees F -20 -20 -15
Flash Point, COC-F 400 415 430
Oxidation Stability- >3500 Hours >3500 Hours >3500 Hours

Contact us for product information or request bulletins and technical papers.

Download a PDF version of this page.

Die Casting Foundry News

Die Casting Defects - Causes and Solutions - NADCA Book

Die Casting Defects - Causes and Solutions - NADCA Book

NADCA offers its book outlining the causes of die casting defects and how to prevent them This is a comprehensive textbook for die casting engineers. This...
Read More

Request SDS

Safety Data Sheets for Metal Casting Supplies, Die Casting Supplies, Metalworking Supplies, Concrete Casting Supplies

Show Schedule

NPCA Precast Concrete Show

The Precast Show
March 5-7, 2020
Louisville, KY
Booth # TBA
More Information »

Metalcasting Congress 2020

AFS Metalcasting Congress
April 21-23, 2020
Cleveland, OH
Booth # TBA

More Information »

Die Casting Tabletop 2019

Die Casting Congress & Tabletop
October 1-3, 2019
Cleveland, Ohio
More Information »

Aquapart Parting Compound for Green Sand Metalcasting

Aquapart® II - Water Based Parting Agent

Use Less Seacoal and Still Get Super Clean Castings
Read More »

Our Sister Companies

HG Logistics LLC

New logistics services from Hill and Griffith

HG Logistics LLC provides logistics management services for the U.S., Canada and Mexico.
Read More »

Griflube Hydraulic Fluids

Griflube Hydraulic Fluids

Environmentally Clean, High Pressure, High Temperature.
Read More»

Murphy Air Sprayers for casting applications

New Murphy Sprayer for coating and washing

Rugged design assures dependable coverage and maximum efficiency.
Read More »