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Fuchs Hydrotherm 46 M Fire Resistant High Quality Hydraulic & Lubricating Oil

Fuchs Hydrotherm 46 M Fire Resistant High Quality Hydraulic & Lubricating Oil

Fuchs Hydrotherm 46 M Fire Res - 20L (Drum)

20L (Drum)


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  • Description
  • Benefits
  • Specifications
  • Technical Info
  • Shipping Explained

Fuchs Hydrotherm 46 M Fire Resistant High Quality Hydraulic & Lubricating Oil

Lead Time Warning:

Please note that some industrial and commercial products are made to order and therefore have an extended lead time. For exact delivery timescales get in touch with the Opie Oils team.

Fire resistant, Group HFC hydraulic oil

Fire resistant, group HFC hydraulic fluid according to DIN 51 502, aqueous polymer solution containing up to 50 % water.
HYDROTHERM 46 M fulfils the requirements of the 7th Luxembourg Report, is biodegradable and free of nitrite and monoethylene glycol.

Fire resistant HFC hydraulic fluid according to VDMA 24 317 for use in mobile and stationary hydraulic systems where there is a risk of fire, in the steel industry in rolling mills, in die-casting bays and in mining applications.

To ensure fire resistance, the product should not be used at temperatures above +60C.

Method of Use:
To change over from mineral oil, drain and clean the system thoroughly. Drain and clean out the reservoir and drain and blow out all pipelines. Clean valves and remove pumps, accumulators and cylinders for draining where practicable.

Approximately half fill the system with HYDROTHERM 46 M and run for 24 hours under no load conditions, operating all functions of the hydraulic system. Drain thoroughly and discard this flushing charge. Charge the system to half full and operate the system. Sample the fluid to ensure the flushing procedure has
been successful and then fill to the correct operating capacity.

When starting up a new hydraulic system or after switching from mineral oil to HYDROTHERM 46 M, the hydraulic system should be “run-in” for at least
one hour at reduced pressure (20 to 40 bar).

Fluid Maintenance:
Some slight water loss from the fluid can be expected over prolonged use dependent upon operating temperature and system breathing. A reduction of the water content will increase the viscosity of the fluid. The typical water content of HYDROTHERM 46 M is 44% and should be between min. 35% and max. 48%. Thus, regular samples of the fluid should be taken to check that the water content is maintained above 35% to ensure that satisfactory fire resistance is maintained.

Is this the right product?

Making sure that you use the right oil, lubricant, grease or product for your commercial / industrial application is especially important when dealing with expensive machinery.

If you are unsure if this product is right for your needs or have any other questions please feel free to get in touch or use our Recommendation form.

Industrial Help / Recommendation Form

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • Approved according to the 7th Luxembourg Report
  • Good wear protection
  • High viscosity index
  • Low pour point
  • Optimised corrosion protection
  • Good heat conductivity
  • High resistance to bacteria, fungi and yeasts
  • Easily filtered
  • Free of nitrite and MEG (monoethylene glycol)
  • Biologically degradable
  • Also available dyed red for identification purposes as HYDROTHERM 46 M RED


  • HYDROTHERM 46 M fulfils the requirements of the 7th Luxembourg Report and is approved for use in the German lean coal mining industry.

Technical Information:

Test Method

DIN 51 519
Kinematic viscosity
at 40ºC
at 100ºC


DIN 51 550 and DIN 51562-1
Viscosity index-
195DIN ISO 2909
Density at 15ºCkg/m3
1084DIN 51 757
Colour index
Pour point
ºC-42DIN ISO 3016
pH value

9.9DIN 51 369
Mechanical vane pump test
Loss in weight: ring
Loss in weight: vanes


DIN 51 389-3

Compatibility with elastomers and plastic materials used for seals and hoses
CompatibleNot Compatible
NBR, X-NBR, H-NBRLeather
Flange seals made of "-it" materials, e.g. Klingerit1 Please contact the manufact


SHIPPING IS FREE* for orders of £60 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £4.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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