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Brown Rock Salt

Material Safety Data Sheet

1. Identification of the Substance


Emergency Phone Number:
For specialist advice in an emergency telephone
Winsford; (01606) 592201

2. Product Description

Rock Salt is approximately 94% pure salt and has a characteristic reddish-brown
colour owing to the presence of marl (an insoluble mineral) which is the chief impurity. The salt
is treated with approximately 30 ppm sodium ferrocyanide as an anticaking agent.
Alternative Names: Sodium Chloride, Common Salt, Halite
CAS Number: Sodium Chloride 007647-14-5
Sodium Ferrocyanide 13601-19-9
EINECS Number: Sodium Chloride 231-598-3
Sodium Ferrocyanide 237-081- 9
Hazardous Ingredients Contains no Hazardous Ingredients
EC Directive 93/112/EEC
MSDS – Rock Salt June 2012-06-15

3. Hazards Identification

Unlikely to cause harmful effects under normal conditions of handling and use.

4. First Aid Measures

Inhalation: Remove patient from exposure.
Skin Contact: Wash skin with water.
Eye Contact: Irrigate with eyewash solution or clean water,
holding the eyelids apart, for at least 10 minutes. If
symptoms develop, obtain medical attention.
Ingestion: Wash out mouth with water and give 200-300ml (half a
pint) of water to drink. Obtain medical attention if illeffects
occur. Further Medical Treatment:
Symptomatic treatment and supportive therapy as

5. Fire Fighting Measures

Extinguishing Media: As appropriate for surrounding fire.
Fire Fighting Protective Equipment: No special requirements.

6. Accidental Release Measures

• Clear up spillages.
• Transfer to a container for disposal.
• Wash the spillage area with water.
• Spillages or uncontrolled discharges into water courses, drains or sewers must
be IMMEDIATELY alerted to the Environment Agency or other appropriate
regulatory body
MSDS – Rock Salt June 2012-06-15

7. Handling and Storage

Avoid contact with eyes. Avoid prolonged skin contact. Atmospheric levels should be controlled
in compliance with the occupational exposure limit for dust. Keep away from strong acids and
common metals. Static electricity can be generated by pneumatic conveying, therefore pipes
should be bonded and earthed, especially where a spark could prove hazardous.
Keep away from concentrated acids. Rock salt can be stored outside but will absorb moisture
over time. Care should be taken to avoid excessive run-off into water or onto vegetation

8. Personal Protection and Exposure Controls

Wear suitable protective clothing, gloves and eye/face protection. An approved dust mask
should be worn if exposure to levels above the occupational exposure limit is likely.
Occupational Exposure Standard (UK HSE Guidance Note EH40)
Time Weighted Average
mg/m3 (ppm)
Dust (Total Inhalable Dust) 10
Dust (Respirable Dust) 4

9. Physical and Chemical Properties

Form: Crystalline solid
Colour: Red-brown
Odour: Odourless
Boiling Point (Deg C): 1413
Melting Point (Deg C): 802
Density of Sodium Chloride (g/ml): up to 2.165 at 20 Deg C
Bulk Density (g/ml): 1.2 to 1.5 approx
Solubility (Water): freely soluble, with some insoluble
marlstone residue
MSDS – Rock Salt (Darlies Ltd) June 2012-06-15
Dryrox 10 0-10mm
Dryrox 6 0-6mm
Thawrox 10 0-10mm
Thawrox 6 0-6mm

10. Stability and Reactivity

Hazardous Reactions: Reactions with concentrated acid will produce hydrogen chloride. Under
wet conditions, will corrode many common metals, particularly iron, aluminium and zinc.

11. Toxicological Information

Inhalation: High concentrations of dust may be an irritant to the respiratory
Skin Contact: Will remove the natural greases resulting in dryness, cracking and
possibly dermatitis. Repeated and /or prolonged skin contact may cause
Eye Contact: Dust may cause irritation.
Ingestion: May cause vomiting and diarrhoea. The swallowing of small
amounts is unlikely to cause any adverse effects.
Long Term Exposure: Repeated ingestion of excessive amounts may cause
disturbance of body electrolyte and fluid balance.

12. Ecological Information

Environmental Fate and Distribution
High tonnage material with wide disperse use. Solid with low volatility.
The product is soluble in water. The product has no potential for
bioaccumulation. The product is predicted to have high mobility in soil.
Toxicity: Low toxicity to aquatic organisms.
Effect on Effluent Treatment: Adverse effects would not be expected.
MSDS – Rock Salt June 2012-06-15

13. Disposal Considerations

Disposal should be in accordance with local, national and European Community

14. Transport Information

Not classified as dangerous for transport

15. Regulatory Information

Not classified as dangerous for supply or use

16. Other Information

This data sheet was prepared in accordance with Directive 93/112/EC and the Chemicals (Hazard
Information and Packaging for Supply) Regulations 1994. Information in this publication is believed to
be accurate and is given in good faith but the Customer should ensure the suitability for any particular
purpose. Accordingly, Salt Union gives no warranty as to the fitness of the Product for use and any
implied warranty or condition (statutory or otherwise) is excluded except to the extent that such
exclusion is prevented by law. Freedom under Patent, Copyright and Designs cannot be assumed.