Magnesium Chloride Brine Interactive Table: Temperature – Density – Concentration

Yuze Magnesium Chloride Factory releases this magnesium chloride brine density-temperature-concentration interaction table for the following core functions:

Rapid on-site concentration testing: Measure with a hydrometer or Baume meter, then check the table to read the mass percentage without waiting for laboratory results.

Dosing calculation for solution preparation: Calculate the required dosage of magnesium chloride hexahydrate and water input according to target concentration and solution volume.

Eliminate temperature-induced errors: Density of the same brine differs between summer and winter. This interactive table supports temperature correction to prevent concentration misjudgment.

Preliminary inspection for incoming goods: Test density upon delivery and cross-check with the table for an initial content assessment to avoid inferior products.

Process control guidance: Support freezing point control for deicers, magnesium adjustment for aquaculture, Baume degree control for brine used in magnesium oxide boards, and anti-freezing for refrigeration brines, all based on concentration-density correlation.

1. Density Table of Magnesium Chloride (MgCl₂) Aqueous Solution

Unit: g/cm³ (20 ℃ benchmark + temperature correction) Density Query Table (g/cm³) · Row = Mass Fraction, Column = Temperature

Note: Grey italic values marked with * are theoretical extrapolations exceeding saturated concentration at the corresponding temperature; crystallization will occur in practice.

Data and Algorithm Notes

20 ℃ benchmark data: Density values for MgCl₂ mass fraction 1–31% are sourced from public aqueous solution tables (1% →1.006, 10% →1.083, 20% →1.174, 30% →1.276 g/cm³). The saturation point at 35.3% has a density of 1.331 g/cm³. Temperature correction: Adopts the engineering approximation that the relative density ratio ρ(solution)/ρ(water) remains nearly constant. Pure water density is calculated using the Kell equation. The general error is about ±0.5–1.5% within 0–100 ℃, and the data align perfectly with the benchmark table at 20 ℃. Saturation concentration (mass fraction): 0 ℃: 34.6%, 20 ℃: 35.3%, 40 ℃: 36.5%, 60 ℃: 37.9%, 80 ℃: 39.8%, 100 ℃: 42.2%. Values beyond the saturation line are theoretical extrapolations and will crystallize in reality. Baume degree: Calculated by the heavy-liquid formula: °Bé = 144.3 × (1 − 1/ρ). Application: Quick reference for incoming inspection, solution preparation, and conversion of hydrometer / Baume meter readings. For formal trade settlement, please rely on actual measured density and third-party laboratory test reports.

Benchmark Data

20 ℃ is the measurement benchmark, key data as follows:

This set of 20 ℃ data comes from published magnesium chloride solution density tables. The maximum deviation of this model against the benchmark table at 20 ℃ is only 0.00003 g/cm³. Temperature correction uses the engineering approximation of constant ρ(solution)/ρ(water), and pure water density is computed by the Kell equation. The error is roughly ±0.5–1.5% between 0–100 ℃, with higher accuracy closer to 20 ℃. Saturation concentration: 0 ℃: 34.6%, 20 ℃: 35.3%, 40 ℃: 36.5%, 60 ℃: 37.9%, 80 ℃: 39.8%, 100 ℃: 42.2%.

Important Usage Reminders

Concentration shown in this table stands for MgCl₂ mass fraction, not magnesium chloride hexahydrate (MgCl₂·6H₂O) mass fraction. If dosing by magnesium chloride hexahydrate, conversion is required: Mass of magnesium chloride hexahydrate = Mass of MgCl₂ × 203.30 / 95.21 ≈ ×2.135

Dosing Calculation for Magnesium Chloride Hexahydrate

Calculation logic: Mass of MgCl₂ = Total mass of solution × Target concentration Raw material dosage = Mass of MgCl₂ ÷ Declared MgCl₂ content of the product Water addition = Total mass of solution − Raw material dosage

Key point: Crystal water and impurities contained in the raw material are already included in the total raw material weight. There is no need to deduct crystal water separately when calculating water addition.

Practical Verification Example

Conditions: 20 ℃, target MgCl₂ concentration 20%, product 46% MgCl₂, target volume 1000 L

When switching to 47% white flake magnesium chloride, the raw material dosage becomes 499.6 kg. At 60 ℃, the density drops to 1.156 g/cm³ and the required water volume changes accordingly.

Further reminder: The declared content of the product in this calculation module is based on MgCl₂. If the supplier’s COA reports content on a MgCl₂·6H₂O basis, conversion is required (100% magnesium chloride hexahydrate equals 46.83% MgCl₂). Do not directly use 99% as the content value. The theoretical MgCl₂ content of pure magnesium chloride hexahydrate is 46.83%. Therefore, 46% magnesium chloride flakes are close to the theoretical value; grades marked 47% are generally acid-process white magnesium chloride flakes. A prompt will appear when the target concentration approaches or exceeds the saturation concentration at the working temperature. Solutions formulated beyond the saturation line will crystallize and cannot be prepared directly according to the table

2. Industry Solutions for Downstream Customers

Limitations & Disclaimers

Clarify the boundaries to avoid misuse:

Density measurement cannot replace chemical testing. Impurities such as magnesium sulfate and sodium chloride raise density readings. A reading that appears equivalent to 46% does not prove the actual MgCl₂ content is 46%. Titration or third-party testing is required for accurate confirmation.

Temperature correction is an engineering approximation with ±0.5–1.5% error within 0–100 ℃.

Crystallization occurs above saturation. Supersaturated values in the table are theoretical extrapolations only and cannot be used for formulation.

Please note that this table applies to pure MgCl₂ aqueous solution only. If the brine contains large amounts of NaCl, MgSO₄ or CaCl₂, the actual MgCl₂ concentration will be lower than the table value at the same density, which leads to overestimation by direct lookup. Yuze Magnesium Chloride Factory publishes this table to support rapid preliminary evaluation for users. Without this reference table, users have to send samples to the lab repeatedly and delay production. With this table for preliminary screening followed by laboratory testing, overall production efficiency is greatly improved.