Heat transfer fluids

LM-4 series

Name: LM-4 series
Brand: Glacier Coolant

Versatile glycol-type heat transfer fluids

The versatile industrial range: water-dilutable fluids with model-specific options for aluminium protection, elevated temperatures, pharmaceutical processes and data-centre circulation.

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An LM-4 labelled sample flask containing red-orange coolant — LM-4 sample. Other formulations and concentrations may differ in appearance.

CATALOGUE TEMPERATURE REFERENCE−35°C to +150°C · model-dependent

Formulation

Modified diols

A closer look.

Industrial cooling and heating
Dedicated data-centre models
Low-conductivity formulations available
LM-4D: silicon-free, phosphonate-free, amine-free, nitrite-free · non-ionic inhibitors

Model and property references

LM-4 / LM-4L: −35 to +50°C; LM-4L adds aluminium compatibility
LM-4G / LM-4GL: −35 to +150°C; high-temperature resistance
LM-4-BP: −35 to +130°C; no inorganic salt additives, high-temperature resistance
LM-4Q: −30 to +25°C; standard type
LM-415L: 0 to +80°C; data-centre circulation
LM-420 / LM-420D-YE: −3 to +80°C; data-centre circulation
LM-425D-YE: −6 to +80°C; data-centre circulation
LM-440 / LM-450 / LM-455: −18 to +50°C / −30 to +50°C / −35 to +50°C; customisable grades
LM-450G / LM-455G: −30 to +100°C / −35 to +100°C; custom high-temperature grades
LM-4D: −35 to +100°C; fuel-cell cooling formulation
LM-4D stock conductivity: <1 µS/cm at 20°C; 50 % dilution <5 µS/cm (manufacturer's product page)
LM-4D-YE: −35 to +130°C; organic version, free of silicon, phosphorus and nitrites (product list, April 2026)

LM-4, LM-4D and LM-4D-YE (mfr. data-centre application document)

Property	LM-4	LM-4D	LM-4D-YE
Base fluid	Modified glycol	Modified glycol/water	Modified glycol in deionised water
Inhibitor system	Corrosion inhibitors, anti-mildew agents, solubilisers, water stabilisers	Non-ionic organic; free of silicon, phosphorus, amines and nitrites	Organic composite; free of silicon, phosphorus and nitrites
Operating range (°C)	−35 to +150 for the series	−35 to +100	−35 to +130
Electrical conductivity, undiluted (µS/cm)	1580	<1	—
Electrical conductivity, 50 % dilution (µS/cm)	2520	1.01	502.9
Boiling point (°C)	>140	—	—
Flash point (°C)	>120	—	—
Viscosity at 20°C, undiluted (cP)	13.92	—	—
Density at 20°C, undiluted (g/cm³)	1.105–1.125	—	—
Specific heat at 20°C (cal/g·°C)	0.619	—	—
Thermal conductivity at 20°C (W/(m·K))	0.26	—	—
Metals	Carbon steel, stainless steel, copper	Aluminium, stainless steel, brass, copper	Aluminium, stainless steel, carbon steel, copper
Dilution water	Water	Ultrapure water	Purified water

From the manufacturer's data-centre application document. LM-4D is described there with a 50 % dilution conductivity below 5 µS/cm and tabulated at 1.01 µS/cm; the tabulated figure is the measurement and the stated limit is the ceiling. Its LM-4D-YE operating range is −35 to +130°C; the manufacturer's BESS liquid-cooling document states −35 to +150°C for the same model.

LM-4, LM-4D and LM-4D-YE at 50 % dilution (mfr. data-centre application document)

Property at 50 % dilution	LM-4	LM-4D	LM-4D-YE
Freezing point (°C)	−35	−35	−34
Boiling point (°C)	107	107	107
pH	6.27	6.27	8.93
Electrical conductivity (µS/cm)	2520	1.01	502.9
Viscosity at +20°C (cP)	3.75	3.88	4.30
Viscosity at +10°C (cP)	5.17	5.47	6.09
Viscosity at 0°C (cP)	8.02	8.25	9.18
Viscosity at −10°C (cP)	12.9	13.19	15.14
Viscosity at −20°C (cP)	22.30	23.40	—
Density at +20°C (g/cm³)	1.066	1.068	1.070
Density at +10°C (g/cm³)	1.071	1.074	1.075
Density at 0°C (g/cm³)	1.076	1.080	1.080
Density at −10°C (g/cm³)	1.080	1.084	1.085
Density at −20°C (g/cm³)	1.084	1.089	—

Standard packaging: 25 kg plastic drum; 200 kg iron drum; 1100 kg ton drum; bulk tanker above 10 t

Reference values from the Chaoyang Guangda LM catalogue — typical figures rather than guaranteed limits. Confirm the exact model and concentration on the current model TDS before specifying.

View source: catalogue p.11 (PDF p.15)

Before you specify

Model and dilution set the operating limits. LM-4D takes ultrapure-water dilution with conductivity and pH checks every three months. Compatibility is listed per model in the tables below; zinc and galvanised metal fall outside the compatibility list for LM-4D. Immersion service takes a fluid specified for immersion.

FROM FORMULATION TO APPLICATION

One family. Different circuit requirements.

The LM-4 range spans industrial secondary cooling and specialised electronic cooling circuits. Model suffixes matter: they identify different material-compatibility and application requirements.

01 / APPLICATION NOTE

Choose for the circuit

Discuss pharmaceutical, chemical and HVAC circulation separately from fuel-cell or data-centre cooling. An industrial formulation is not automatically suitable for an electronic cooling loop.

02 / APPLICATION NOTE

Concentration and compatibility

Confirm the water quality, dilution and inhibitor programme for the selected model. Do not extend an aluminium-compatibility statement or low-conductivity value to the whole family.

REFERENCED MODELS

LM-4 · LM-4L · LM-4G · LM-4GL · LM-4BP · LM-4D · LM-4D-YE

About these product references

Application notes are adapted from Glacier’s original product information. Unless a table states otherwise, numeric specifications follow the supplied catalogue. For the confirmed specification, obtain the current model-specific TDS and SDS. Links below point to the original source pages, not new technical documents.