Coolant concentrate that protects the engine against freezing, overheating and corrosion – mixed in a ratio tailored to the climate and application.
HEPU® P999-YLW Coolant Concentrate (Yellow)
HEPU® P999-YLW is part of the P999 series – a complete range of HEPU® coolant concentrates developed for modern cooling systems, from passenger cars to heavy-duty vehicles. Like every product in the series, it is supplied undiluted, so the workshop can prepare exactly the right mixing ratio for the climate and application, providing year-round protection against freezing, overheating and corrosion.
P999-YLW is the yellow-coloured concentrate of the series, based on ethylene glycol and formulated for all-purpose use in aluminium and cast-iron engines. It also protects the cooling system against scale formation. Mixed 1:1 with demineralised water it protects down to −38 °C.
Key features
Benefits
| Parameter | Value |
|---|---|
| Product type | Coolant / antifreeze — full concentrate |
| Base | Ethylene glycol (ethanediol) 90–<95 % |
| Colour | Yellow |
| Odour | Mild |
| Density at 20 °C | 1.125 g/cm³ |
| pH at 20 °C | 8.4 |
| Kinematic viscosity at 20 °C | 21 mm²/s |
| Boiling point | 108 °C |
| Frost protection (1:1 with water) | down to −38 °C |
| Flash point | 111 °C |
| Auto-ignition temperature | > 400 °C |
| Flammability | Non-flammable |
| VOC content | 0.00 % |
| Solubility in water | Fully miscible |
| Free of | Nitrite, amine, phosphate |
| Application | Engine coolant (mix with water before use) |
HEPU® P999-YLW is a concentrate and must be mixed with clean water before filling the cooling system.
Method
Mixing ratio → frost protection
| Concentrate : Water | Frost protection |
|---|---|
| 50 : 50 | −38 °C (verified HEPU figure) |
| ~40 : 60 | ~ −25 °C (approx.) |
| ~60 : 40 | ~ −52 °C (approx.) |
Guidance: keep the concentrate content between 33 % (minimum, for year-round corrosion protection) and 60 % (practical maximum). Higher glycol content does not improve frost protection and reduces heat transfer.
HEPU® P999-YLW is recommended for use according to the following specifications and standards:
Always confirm the coolant type and colour required by the vehicle manufacturer before topping up or mixing with another product.
SAFETY WARNINGS
Hazard-determining components of labelling:
ethanediol
Hazard statements
Precautionary statements
Full details in the Safety Data Sheet (SDS), available for download.
MANUFACTURER AND ENTITY RESPONSIBLE FOR PLACING THE PRODUCT ON THE MARKET
HEPU® Autoteile GmbH
Am Kreuzweg 2, 32689 Kalletal-Hohenhausen
Germany
Safety data sheet / Sicherheitsdatenblatt
Other files / Andere Dateien
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HEPU® Coolant Catalogue
Discover the complete range of HEPU® coolants and coolant concentrates in one catalogue. From high-quality coolant concentrates (P999 series) and ready-to-use coolants (P900 / P888) to windscreen washer fluid, windscreen de-icer and AdBlue – all developed without the addition of nitrites and phosphates and compliant with the specifications of individual vehicle manufacturers.
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