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Diamond	Hazard	Value	Description
0 4 2 W	Health	4	Can be lethal.
	Flammability	0	Will not burn under typical fire conditions.
	Instability	2	Readily undergoes violent chemical changes at elevated temperatures and pressures.
	Special	W	Reacts violently or explosively with water.

A clear colorless liquid with a pungent odor. Corrosive to metals and tissue. Exposure to the fumes or brief contact can cause severe burns as mixture penetrates to cause deep-seated ulceration that is sometimes complicated by gangrene.

• Strong Oxidizing Agent
• Known Catalytic Activity
• Water-Reactive

Soluble in water with evolution of heat spattering of acid fumes.

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above 65%) may act as oxidizers. Also consult ERG Guide 140. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Substance may react with water (some violently), releasing corrosive and/or toxic gases and runoff. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. (ERG, 2024)

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental contamination. (ERG, 2024)

HYDROFLUORIC ACID AND SULFURIC ACID MIXTURE reacts exothermically with bases of all kinds, both organic (amines, amides) and inorganic (oxides and hydroxides of metals). If diluted with water (below 65%) reacts with many metals (aluminum, zinc, iron, steel) to generate hydrogen gas with the possibility of explosion. May react explosively with cyanogen fluoride, methanesulfonic acid or glycerol mixed with nitric acid. May react violently with arsenic trioxide, phosphorus pentachloride, acetic anhydride, ammonium hydroxide, chlorosulfonic acid, ethylenediamine, fluorine, potassium permanganate, oleum, propylene oxide, vinyl acetate, mercury(II) oxide. Emits highly corrosive fumes of hydrogen fluoride gas when heated [Sax, 9th ed., 1996, p. 1839]. Contact with silicon compounds, especially metal silicides, may cause evolution, often violent, of toxic silicon tetrafluoride gas [Mellor, 1956, Vol. 2, suppl. 1, p. 121].

For Sulfuric Acid look at the Sulfuric Acid datasheet.

• Acids, Strong Oxidizing
• Fluoride Salts, Soluble

Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below.

• Cellulose-Based Absorbents
• Mineral-Based & Clay-Based Absorbents
• Expanded Polymeric Absorbents
• Sand
• Dirt/Earth

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.

SPILL: Increase the immediate precautionary measure distance, in the downwind direction, as necessary.

FIRE: If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2024)

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

Note: Some foams will react with the material and release corrosive/toxic gases.

SMALL FIRE: CO2 (except for Cyanides), dry chemical, dry sand, alcohol-resistant foam.

LARGE FIRE: Water spray, fog or alcohol-resistant foam. If it can be done safely, move undamaged containers away from the area around the fire. Avoid aiming straight or solid streams directly onto the product. Dike runoff from fire control for later disposal.

FIRE INVOLVING TANKS, RAIL TANK CARS OR HIGHWAY TANKS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks in direct contact with flames. (ERG, 2024)

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. All equipment used when handling the product must be grounded. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. A vapor-suppressing foam may be used to reduce vapors. DO NOT GET WATER INSIDE CONTAINERS. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. Prevent entry into waterways, sewers, basements or confined areas.

SMALL SPILL: Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean, non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal. (ERG, 2024)

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer when there is NO RISK OF FIRE. Structural firefighters' protective clothing provides thermal protection but only limited chemical protection. (ERG, 2024)

Normalized Breakthrough Times (in Minutes)

Chemical	CAS Number	State	QS	QC	SL	C3	TF	TP	RC	TK	RF
Hydrofluoric acid (48-51%)	7664-39-3	Liquid	400	446	>480	>480	>480	15	>480	>480	>480
Hydrofluoric acid (60%)	7664-39-3	Liquid					52
Hydrofluoric acid (70%)	7664-39-3	Liquid			143	126	35		>480	>480	>480
Hydrogen fluoride (20-27掳C, gaseous)	7664-39-3	Vapor		imm	93*/134	186	imm	imm	130	>480	>480
Sulfuric acid (30%)	7664-93-9	Liquid						>480
Sulfuric acid (50%)	7664-93-9	Liquid						>480
Sulfuric acid (70%)	7664-93-9	Liquid						>480
Sulfuric acid (98% at 50掳C)	7664-93-9	Liquid					>480
Sulfuric acid (>95%)	7664-93-9	Liquid	>480	>480	>480	>480	>480	50	>480	>480	>480

Special Warning from DuPont: Tychem庐 and Tyvek庐 fabrics should not be used around heat, flames, sparks or in potentially flammable or explosive environments. Only...

(DuPont, 2024)

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:

Refer to the "General First Aid" section. Specific First Aid: For corrosives, in case of contact, immediately flush skin or eyes with running water for at least 30 minutes. Additional flushing may be required. In case of skin contact with Hydrofluoric acid (UN1790), if calcium gluconate gel is available, rinse 5 minutes, then apply gel. Otherwise, continue rinsing until medical treatment is available. (ERG, 2024)

• HYDROFLUORIC ACID AND SULFURIC ACID MIXTURE
• HYDROFLUORIC ACID AND SULPHURIC ACID MIXTURE
• HYDROFLUORIC-SULFURIC ACID MIXTURE
• SULFURIC ACID AND HYDROFLUORIC ACID MIXTURES
• SULPHURIC ACID AND HYDROFLUORIC ACID MIXTURES