Denison HF-0 vs HF-1 vs HF-2: What Does Each Approval Require?

This comparison covers the three mineral oil grades only. Parker's HF-3 to HF-6 grades cover invert emulsions, water glycols, phosphate esters and biodegradable fluids, each with its own procedure.

How do Denison HF-0, HF-1 and HF-2 differ?

Denison HF-0, HF-1 and HF-2 differ in which pump type a mineral hydraulic oil has proven itself in: HF-0 covers piston and vane pumps, HF-1 axial piston pumps and HF-2 vane pumps (Parker MSG30-0004, 2026). Parker's rating list describes HF0 as mineral base oils with stabilized antiwear additives for severe duty with water present at 1%, and states that "HF0 includes the HF1 and HF2 cases" (Parker MSG30-0004, 2026). That is why a data sheet for an HF-0 rated oil often lists all three grades.

The table below decides which grade a pump fleet needs.

The key row is the pump test: one T6H20C run produces all three grades, and the grade follows from which of the two pumps survives in satisfactory condition (Parker TP-30533, 2019). Parker's T6 catalog adds a field consequence: it groups HF-0 and HF-2 as mineral oils with antiwear additives and HF-1 as mineral oils without them (Parker HY29-0002/FR, 2015).

Which tests does each Denison HF approval require?

Each Denison HF approval requires one Parker Denison T6H20C hybrid pump test plus the bench tests in Parker's TP-30560 requirement sheet, and the bench limits are the same for HF-0, HF-1 and HF-2 except vane pump wear and an HF-2-only T6C 020 dry-phase viscosity check (Parker TP-30560, Rev. c, 2001).

The T6H20C test runs a vane pump at 250 bar and a piston pump at 280 bar, 1700 rpm, on ISO 46 grade oil, then adds 1% water between hours 307 and 308; the whole test lasts 608 hours (Parker TP-30533, 2019). The vane pump is judged on total vane and holdout pin weight loss of 15 mg maximum plus cam ring and port plate condition; the piston pump on the condition of its pistons, wear plate, hanger, barrel and port plate (Parker TP-30533, 2019).

The main bench limits shared by HF-0, HF-1 and HF-2 include:

• Viscosity index of 90 minimum and no rust in distilled and synthetic sea water (Parker TP-30560, Rev. c, 2001).

• No foam after 10 minutes, demulsibility of 40/37/3 within 30 minutes, filterability with and without 2% water (Parker TP-30560, Rev. c, 2001).

• Sludge and corrosion over 1000 hours, thermal stability for 168 hours at 135°C, hydrolytic stability (Parker TP-30560, Rev. c, 2001).

• Shear loss of 15% maximum, high viscosity index oils only (Parker TP-30560, Rev. c, 2001).

• Deaeration of 7 minutes maximum on ISO 46 and an aniline point above 100°C, with a DIN 51524 seal test if it is lower (Parker TP-30560, Rev. c, 2001).

The current HF-0 standard points to T6H20C results (Parker HF-0 standard, Rev. e, 2026). Earlier HF-0 approvals used a P46 piston pump and a T5D vane pump; "Both pumps are run for 100 hours" (Jackson and Marty, 1997).

What is the difference between meets Denison HF-0 and approved for Denison HF-0 on a data sheet?

Approved for Denison HF-0 means the fluid is on Parker's fluid rating list MSG30-0004; meets Denison HF-0 is the supplier's own statement, and Parker's standard does not accept that alone. The HF-0 standard says: "In addition to meeting these requirements, the fluid must be included on the Parker Fluid rating List MSG30-0004" (Parker HF-0 standard, Rev. e, 2026). The HF-1 and HF-2 standards carry the same condition, naming the Approved List (Parker HF-1 and HF-2 standards, Rev. 2006).

Parker also sets how a listed fluid may be described. Manufacturers may reference the rating "while noting that the testing was pursuant to the Parker-Denison Vane Technology TP-30532 and TP-30533 procedures and listing any other relevant qualifications, such as validity date and temperature limitations" (Parker MSG30-0004, 2026). For unrated fluids, Parker "makes no guarantees as to their compatibility with its products" (Parker MSG30-0004, 2026).

In practice, read a data sheet in three steps. Find whether Denison HF sits under approvals or under meets or exceeds. If it sits under approvals, find the product on the current list. If it sits under meets, treat it as a claim without a Parker rating and ask the supplier for the T6H20C report. For working through an approval list against a specification line by line, see How do you find the missing tests for an OEM lubricant approval?.

When is Denison HF-1 or HF-2 enough instead of HF-0?

Denison HF-1 is enough when the circuit runs only piston equipment, and HF-2 when it runs only vane equipment; a circuit with both pump types, or with severe duty and water present, calls for HF-0. Parker's HF-1 standard covers fluids "suitable for piston equipment at full catalog rating" and tells users to "Consult your pump manufacturer for operating limits of vane equipment with fluids meeting this standard" (Parker HF-1 standard, Rev. b, 2006). The HF-2 standard gives the mirror condition for piston equipment (Parker HF-2 standard, Rev. h, 2006).

HF-0 is the only one of the three that the standard calls satisfactory for "all axial piston, vane, and valve products operating at full performance rating" (Parker HF-0 standard, Rev. e, 2026). Both HF-1 and HF-2 standards state that all fluids meeting HF-0 are acceptable for their equipment, so HF-0 replaces either one.

Expect lower ratings with HF-1 fluids in vane pumps. Parker's T6 vane pump catalog says fluids other than mineral oils with antiwear additives reduce the maximum values in the catalog, and it raises the minimum viscosity at full pressure and speed from 10 mm2/s for HF-0 and HF-2 to 18 mm2/s for HF-1 (Parker HY29-0002/FR, 2015). For HF-1 fluids, Parker's HF-1 standard notes that turbine oils with rust and oxidation inhibitors are generally suitable (Parker HF-1 standard, Rev. b, 2006).

How do you confirm a hydraulic fluid is on the Parker Denison fluid ratings list?

A hydraulic fluid is confirmed on the Parker Denison fluid ratings list when its exact commercial name, grade and classification appear on the current MSG30-0004 document from Parker's Hydraulic Fluid Evaluation Process page, within the validity date (Parker MSG30-0004, 2026). Check six points:

1. Download the list from Parker, not from the supplier, and note its review date; the version read for this article carries the review date 14 April 2026.

2. Find the manufacturer and the exact commercial name. Series names with suffixes such as HVI or Plus are listed as separate entries (Parker MSG30-0004, 2026).

3. Read the classification column: HF0, HF1-HF2 or wider ranges such as HF0-HF6e (Parker MSG30-0004, 2026). An entry printed HF01 is HF0 with footnote 1, a read-across rating (see step 6).

4. Check that the ISO VG 32, 46 or 68 column you buy is marked.

5. Check the validity date; entries are listed for 10 years (Parker MSG30-0004, 2026).

6. Check footnotes: footnote 1 marks a rating "by comparison with two similar favorably rated fluids" under TP-30532, and some entries carry temperature limits such as "Up to 70°C only" (Parker MSG30-0004, 2026).

If the product is missing, ask the supplier for the Parker approval form, which TP-30533 says Parker Vierzon completes (Parker TP-30533, 2019). Lubinpla's submission document check compares an OEM approval list with the OEM's public specification and separates the tests a fluid has met from the tests still missing.