☣️ UN 1970 • CLASS 2
UN 1970 — Krypton, refrigerated liquid (cryogenic liquid)
Placard: Non-Flammable Gas. ERG Guide 120. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 1970 Quick Details
UN 1970
Product name: Krypton, refrigerated liquid (cryogenic liquid)
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 120 (check current ERG)
Initial isolation: ERG 120: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
Common Hazards of UN 1970
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
- Non-flammable gases.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
Chemical Identity & Physical Properties
| Also known as | Refrigerated liquid kryptonCryogenic kryptonLiquefied kryptonLKr |
| CAS Number | 7439-90-9 |
| Appearance | Colorless, odorless cryogenic liquid. Boiling point -153°C (-244°F). Gas is colorless and odorless, denser than air when cold. |
| Flash Point | Not applicable (inert gas) |
| Boiling Point | -153C (-244F) |
| Vapor Density | 2.9 (heavier than air when cold) |
| Water Reactivity | No reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1970
Extinguishing Media
Not applicable (inert gas); use water spray to warm containers from distance
PPE Requirements
⚠️ Insulated gloves and face shield for cryogenic liquid contact; SCBA for confined spaces or oxygen-deficient atmospheres
Isolation & Evacuation
ERG 120: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 120).
First Actions for a UN 1970 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 1970 — Krypton, refrigerated liquid (cryogenicHAZMAT RADIO NOTE — UN 1970
Product: Krypton, refrigerated liquid (cryogenic liquid)
Class 2 / Non-Flammable Gas / ERG 120
PPE: Insulated gloves and face shield for cryogenic liquid contact; SCBA for confined spaces or oxygen-deficient atmospheres
ISOLATION: ERG 120: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1970 — Krypton, refrigerated liquid (cryogenic liquid)
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 120
Appearance: Colorless, odorless cryogenic liquid. Boiling point -153°C (-244°F). Gas is colorless and odorless, denser than air when cold.
Water Reactivity: No reaction
Extinguishing: Not applicable (inert gas); use water spray to warm containers from distance
PPE: Insulated gloves and face shield for cryogenic liquid contact; SCBA for confined spaces or oxygen-deficient atmospheres
Isolation: ERG 120: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
— Key Hazards —
• Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
• Vapors from liquefied gas are initially heavier than air and spread along ground.
• Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1970 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1970 Krypton, refrigerated liquid (cryogenic liquid) Cls2 ERG120 | allfirefighter.com/hazmat/un/1970SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1970
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Frequently Asked Questions about UN 1970
Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite. Non-flammable gases. Containers may explode when heated. Ruptured cylinders may rocket.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Insulated gloves and face shield for cryogenic liquid contact; SCBA for confined spaces or oxygen-deficient atmospheres
Water reactivity: No reaction. Recommended extinguishing: Not applicable (inert gas); use water spray to warm containers from distance.
ERG Guide 120 recommendation: ERG 120: isolate 100m all directions; if tank/rail car involved in fire, isolate 800m all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 120 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.