Magnesium Ribbon — Complete Chemistry Teacher & Lab Guide (2026) | SciMed
Magnesium Ribbon — Complete Chemistry Teacher & Lab Guide (2026)
Direct answers on 99.95% pure lab-grade magnesium ribbon — pricing, safe combustion demonstrations, Grignard reagent prep, bulk procurement, and where to buy without institutional accounts. Written for chemistry teachers, university lab managers, and procurement.
On this page
- What is magnesium ribbon?
- Purity grades — 99.95% vs 99.9% vs 90-95%
- Cost breakdown + SciMed vs Fisher/VWR/Sigma-Aldrich/Amazon
- How to run the classic combustion demonstration (safe protocol)
- Magnesium for Grignard reagent preparation
- Safety, PPE, and fire extinguishing
- Storage + shelf life
- How to buy — teacher, lab, school district, university
- 25 direct answers to common questions
What is magnesium ribbon?
Magnesium ribbon is 99.95% pure elemental magnesium metal (CAS 7439-95-4) rolled into a continuous strip — typically 4mm wide × 0.2mm thick × 70 feet per 25g roll. It is the standard consumable for high school and college chemistry combustion demonstrations, activity-series experiments, Grignard reagent preparation in organic chemistry, and thermite ignition. Ignites at 473°C and burns at 3,100°C with intense bright-white flame.
Purity grades — 99.95% vs 99.9% vs 90-95%
99.95% is the lab-grade / teaching-grade standard. It ignites reliably in 2-3 seconds with a Bunsen burner, burns at predictable rate, and produces pure bright-white flame. 99.9% is acceptable for most teaching. Below 99% (typical consumer/craft-store "magnesium ribbon" from Amazon and eBay), trace impurities cause inconsistent ignition, variable burn rate, and off-color yellow-tinted flame — ruining reproducible classroom demos.
| Purity | Use case | Ignition reliability | Flame color | Typical source |
|---|---|---|---|---|
| 99.95%+ | Lab teaching, research, Grignard prep | Reliable (2-3 sec Bunsen) | Pure bright-white | SciMed, Sigma-Aldrich, Fisher |
| 99.9% | Standard teaching | Reliable | Near-pure white | VWR, Fisher |
| 90-95% | Craft, hobbyist | Inconsistent | Yellow-tinted, variable | Amazon consumer, eBay |
| <90% (alloy) | Not lab appropriate | Unreliable / partial | Off-color | Industrial scrap |
Cost breakdown + market comparison
Lab-grade magnesium ribbon (99.95% pure) costs $15-$90 per 25g roll depending on source. SciMed direct: $19.99 single roll dropping to $15/roll at 100-roll bulk case ($1,499.99). Institutional distributors (Fisher, VWR, Sigma-Aldrich): $28-$90 per single roll due to account-only sales + markup. Amazon "magnesium ribbon" is $10-$25 but typically 90-95% purity with unreliable ignition.
| Source | Purity | Single 25g roll | Bulk 100-roll case | Account required |
|---|---|---|---|---|
| SciMed | 99.95% | $19.99 | $1,499.99 ($15/roll) | No — direct order |
| Fisher Scientific | 99.95% | $28-$45 | $2,200-$3,800 | Yes (institutional) |
| VWR | 99.9% | $32-$48 | $2,400-$3,600 | Yes (institutional) |
| Sigma-Aldrich | 99.95-99.99% | $40-$90 | $3,500-$7,500 | Yes |
| Amazon (generic) | 90-95% (variable) | $10-$25 | Not standard | No |
SciMed's positioning: lab-grade 99.95% purity at direct-manufacturer pricing (30-60% below distributor channel), no institutional account required for individual teachers, same-day US dispatch. Free US shipping on 5-roll and larger bundles ($89.99+). Single 1-roll orders carry $7 flat shipping.
How to run the classic combustion demonstration (safe classroom protocol)
Cut 2-3 cm of magnesium ribbon with crucible tongs, hold over a heat-resistant surface, ignite with Bunsen burner. Ribbon lights in 2-3 seconds and burns 5-15 seconds with intense bright-white flame. Never look directly — use welding shade #3+ UV goggles for direct viewing; students stand at 2+ meters. Collect white MgO powder residue after cooling. Do NOT use water to extinguish — use dry sand or Class D extinguisher only.
- Prepare the room: ventilated lab, fume hood or open windows, students positioned at 2+ meters from demo bench.
- Distribute PPE: welding-grade shade #3+ UV goggles for teacher (direct viewer); standard safety glasses for students at 2m+ distance.
- Cut a 2-3 cm piece of magnesium ribbon using scissors or tin snips. Handle with clean crucible tongs.
- Hold ribbon with tongs over a heat-resistant surface (ceramic tile, sand-filled watch glass).
- Ignite with Bunsen burner flame — the ribbon ignites within 2-3 seconds and burns with intense bright-white flame for 5-15 seconds depending on length.
- Do NOT look directly at the flame. Observe indirectly via reflected light or through UV goggles only.
- Wait for complete combustion. Collect the white MgO powder residue on the heat-resistant surface — this is the product of Mg + O₂ → 2 MgO.
- Cool 5-10 minutes before disposal. MgO is non-hazardous, dispose in normal waste.
Magnesium for Grignard reagent preparation
Magnesium ribbon is the standard metal source for Grignard reagent (R-MgX) synthesis in organic chemistry. Cut fresh ribbon into 1-2 cm pieces, wash briefly in dry ether or dilute HCl to remove surface oxide, add to dry ether/THF solvent under nitrogen, then introduce the alkyl or aryl halide dropwise. Initiation typically requires a small iodine crystal or gentle heat. Purity ≥99.9% is essential — impurities inhibit reaction initiation.
Standard Grignard protocol (McMurry, Clayden, or your undergraduate organic textbook):
- Weigh 1-2 g of magnesium ribbon; cut into 1 cm pieces
- Optional: wash briefly in dry ether or 1M HCl (activates surface)
- Transfer to oven-dried round-bottom flask under nitrogen atmosphere
- Add dry ether or THF solvent
- Add alkyl/aryl halide dropwise (bromides work best; iodides more reactive but less stable)
- Initiate with small iodine crystal or gentle warming if reaction doesn't start spontaneously
- Reflux 15-30 minutes until magnesium fully consumed
- Use immediately — Grignard reagents are moisture-sensitive and cannot be stored long-term
Safety, PPE, and fire extinguishing
| Hazard | Mitigation |
|---|---|
| UV emission (photokeratitis / welder's flash) | Welding shade #3+ goggles for direct viewer; students at 2m+ distance |
| 3,100°C flame temperature | Crucible tongs only, heat-resistant surface, no bare-hand handling |
| Water + burning Mg = H₂ gas explosion | Dry sand or Class D extinguisher only; never water/CO₂/foam |
| Fine Mg dust ignition risk | Do not grind or file ribbon; if cut, dispose of fine shavings in dedicated Class D container |
| Moisture-accelerated oxidation | Store in dry sealed container; use silica gel desiccant packet |
Storage + shelf life
Properly stored (dry sealed container, away from moisture, acids, and oxidizers): magnesium ribbon lasts 5+ years without meaningful degradation. Add a silica gel desiccant packet for humid climates. Signs of degradation: dull grey powdery surface (surface oxidation), reduced ignition reliability, uneven burn. Fresh ribbon shows metallic sheen; degraded ribbon looks white-grey and powdery. If a roll fails to ignite in 5 seconds of Bunsen exposure, it's oxidized — replace.
How to buy — teacher, lab, school district, university
Individual chemistry teachers: order 1-5 rolls direct from SciMed at $19.99-$89.99 (no institutional account required). University teaching labs: 10-roll case at $169.99 covers a semester. School districts and university stockrooms: 100-roll bulk case at $1,499.99 ($15/roll = 25% off) covers annual supply. All shipping same-day US dispatch. Net-30 invoicing available on 10+ roll orders for verified academic/institutional accounts.
| Buyer type | Recommended pack | Price | Typical use duration |
|---|---|---|---|
| Individual chemistry teacher | 1 Roll | $19.99 | 1 semester (single class) |
| Multi-section high school teacher | 5 Rolls | $89.99 ($18/roll) | Full academic year |
| University teaching lab | 10 Rolls | $169.99 ($17/roll) | 1 semester (multiple sections) |
| School district / university stockroom / industrial supply | 100 Rolls | $1,499.99 ($15/roll) | Annual bulk supply |
25 direct answers to common questions
What is magnesium ribbon used for in chemistry?
The classic combustion demo (Mg + O₂ → 2 MgO showing bright-white flame + white ash), activity-series reactivity experiments (Mg + dilute HCl produces H₂ gas), Grignard reagent prep in organic chemistry, thermite ignition, and emission spectroscopy demonstrations. One 25g roll yields 200+ demo pieces at 3cm each.
What purity magnesium ribbon do I need for teaching?
99.95% is the lab-grade / teaching standard. Below 99% causes inconsistent ignition, variable burn rate, and off-color flame — ruining reproducible classroom results. Amazon consumer "magnesium ribbon" is often 90-95% purity.
How much does magnesium ribbon cost?
SciMed direct: $19.99 per single 25g roll, dropping to $15/roll at 100-roll bulk case (25% off). Distributor channel (Fisher, VWR, Sigma-Aldrich): $28-$90 per single roll due to institutional-account markup. Amazon: $10-$25 per roll but purity is often unverified.
Where can I buy magnesium ribbon without an institutional account?
SciMed sells lab-grade 99.95% magnesium ribbon direct to individual teachers and researchers at scimedstore.com — no institutional account or purchase order required. Same-day US dispatch. Free shipping on 5-roll bundles and up.
What is the CAS number for magnesium?
CAS 7439-95-4 (magnesium metal). SDS and certificate of analysis (COA) available on request for institutional safety compliance and audit documentation.
Do students need special eye protection to view burning magnesium?
YES. Magnesium burns at 3,100°C with intense UV emission causing photokeratitis (welder's flash) within seconds of direct viewing. Standard safety glasses are NOT adequate. Use welding-grade shade #3+ UV goggles for direct observation, OR position students at 2+ meters distance for indirect viewing.
How do I extinguish a magnesium fire?
Magnesium fires CANNOT be extinguished with water — H₂O reacts with hot Mg producing hydrogen gas and can accelerate the fire. Use dry sand OR a Class D fire extinguisher only. Never use CO₂, water, foam, or ABC dry-chemical extinguishers on burning magnesium.
Can I use magnesium ribbon for thermite reactions?
Yes — magnesium ribbon is the standard ignition fuse for iron oxide + aluminum thermite. Approximately 3-5cm of Mg ribbon inserted into the thermite mixture provides the ~2,000°C ignition temperature needed. Thermite demonstrations require advanced supervision, outdoor site, and appropriate school district safety approval.
What's the ignition and burning temperature?
Ignition: ~473°C (883°F). Combustion: ~3,100°C (5,610°F). This is hotter than most cutting torches — never handle with bare skin or standard safety glasses.
How long does an opened roll stay usable?
Properly stored (dry sealed container, away from moisture): 5+ years. Signs of degradation: dull grey powdery surface, reduced ignition reliability. If a roll fails to ignite in 5 seconds of Bunsen burner exposure, it's oxidized — replace.
What is the reaction of magnesium with hydrochloric acid?
Mg + 2 HCl → MgCl₂ + H₂↑ (magnesium chloride in solution + hydrogen gas bubbles). This is a classic activity-series experiment showing magnesium's high reactivity above hydrogen. Use dilute HCl (1-2M), small Mg piece, test tube with rubber stopper + delivery tube to collect H₂ over water for "pop test" identification.
What is the reaction of magnesium with oxygen?
2 Mg + O₂ → 2 MgO (magnesium oxide, white powder). This is the classic combustion demo. Exothermic — releases significant heat and intense UV/visible light. Product is basic (MgO + H₂O → Mg(OH)₂ if wet).
Does magnesium react with water?
Slowly with cold water: Mg + 2 H₂O → Mg(OH)₂ + H₂↑ (magnesium hydroxide + hydrogen). More rapidly with steam. This is why NEVER use water on burning magnesium — the reaction accelerates the fire.
What is a Grignard reagent?
An organomagnesium compound of the form R-MgX (where R is an alkyl/aryl group, X is a halide — typically Br or Cl). Formed by reacting magnesium metal with an alkyl or aryl halide in dry ether/THF under inert atmosphere. Grignard reagents are strong nucleophiles used for C-C bond formation in organic synthesis.
Do I need special shipping for magnesium ribbon?
No — for the roll quantities typically sold (25g single up to 100-roll 2.5kg case), magnesium ribbon does NOT trigger DOT/IATA flammable-solids shipping restrictions (Class 4.1 threshold is much higher). Ships via standard ground/air freight.
Can international schools buy magnesium ribbon?
US, Canada, EU, UK, Australia, most Asian markets: no restrictions on small-to-medium quantities for educational/research use. Some Middle East jurisdictions may require import permits due to pyrotechnic classification. Contact the seller with your destination country for pre-shipment compliance check.
What is the difference between magnesium ribbon and magnesium turnings?
Ribbon: continuous 4mm × 0.2mm strip — easy to cut to demo size, uniform surface for reactions. Turnings: small curled shavings from machining — larger surface area (faster reaction) but harder to measure uniformly. Ribbon is preferred for teaching demos; turnings for research reactions where surface area matters.
How do I activate magnesium ribbon for Grignard reagent formation?
Fresh magnesium usually initiates spontaneously in dry ether with the halide. If it doesn't start: (1) add a small iodine crystal, (2) gentle warming, (3) crush a piece with mortar to expose fresh surface, (4) wash briefly in dry ether or 1M HCl to remove surface oxide, or (5) use magnesium turnings (higher surface area).
What safety equipment do I need for magnesium demos?
Welding shade #3+ UV goggles (teacher, direct viewer), standard safety glasses (students at 2m+), crucible tongs, heat-resistant surface (ceramic tile or sand-filled watch glass), Bunsen burner, dry sand OR Class D fire extinguisher (mandatory backup), ventilated space, fume hood optional.
Do you offer bulk pricing for school districts or universities?
Yes. SciMed's automatic volume pricing: 5 rolls $89.99 (10% off), 10 rolls $169.99 (15% off), 100 rolls $1,499.99 (25% off). Net-30 invoicing on 10+ roll institutional orders. For 500+ roll annual supply contracts, email clinic@scimedstore.com for custom pricing.
What documentation is available for institutional purchasing?
SDS (Safety Data Sheet), Certificate of Analysis (COA) with trace impurity analysis, and SAM.gov compliance documentation available on request for institutional safety and audit requirements. Email clinic@scimedstore.com or sales@scimedstore.com.
What is the shelf life of magnesium ribbon?
5+ years when properly stored (dry sealed container, silica gel desiccant, away from moisture/acids/oxidizers). Surface oxidation slowly degrades ignition reliability over time; degraded ribbon looks powdery white-grey vs fresh metallic sheen.
Can I return unused magnesium ribbon?
Unopened rolls: 30-day return window per SciMed's standard policy. Opened rolls: non-returnable per lab consumable handling guidance. Store properly to preserve reusability.
Is magnesium ribbon regulated by ATF or DEA?
Magnesium metal is NOT a scheduled chemical under DEA. ATF classifies pyrotechnic compositions but not raw magnesium metal in the quantities we ship. Some state fire marshals require permits for bulk magnesium storage — check your local jurisdiction for institutional buyers.
How do I contact SciMed for magnesium ribbon questions?
Email sales@scimedstore.com for consumer/teacher orders or clinic@scimedstore.com for institutional/school district/university procurement. Phone/WhatsApp: +1 669 265 9353. Response: 1-2 hours during business hours (9 AM - 5 PM PT Mon-Fri).
Shop SciMed magnesium ribbon (99.95% pure)
$19.99 single roll · $15/roll bulk case · Free US shipping on 5+ roll bundles · Same-day dispatch
Shop Magnesium Ribbon → Bulk / Net-30 Institutional →Content is educational and does not substitute for professional lab safety training. Consult your school district or institution's lab safety officer for site-specific protocols. Last updated: 2026-09-01. Sources: NIST Chemistry WebBook, Sigma-Aldrich Product MSDS, OSHA 29 CFR 1910.1450, DOT 49 CFR 172.101.