Description
DELO-ML® 5250 is a medium-strength, anaerobically curing 1-component adhesive for securing and sealing metallic threaded connections.
- Pack size: 50 g plastic bottle
- Also available in: 200 g bottle
Applications
- Threadlocker for screw connections
- Sealant for metal threads (pipes, fittings)
- Bonding of small metal parts in mechanical engineering
- For temperatures from -60 °C to +150 °C
Features
- Medium-strength curing – removable with standard tools
- Cures in the absence of air (anaerobic), no activator required
- Fluorescent under UV light (blue)
- Solvent-free, unfilled
- DVGW-approved for thread sealing (NG-5146BL0234)
- RoHS-compliant (2015/863/EU)
Technical Data
| Physical Properties | |
|---|---|
| Color (uncured / cured) | Blue / Blue |
| Fluorescence | Yes |
| Density | 1.12 g/cm³ |
| Viscosity | 1,500 mPa·s |
| Typical layer thickness | 0.05-0.1 mm |
| Layer thickness with heat/activator | 0.3-0.4 mm |
| Mechanical Properties | |
| Breakaway torque (phosphated steel) | 26 N·m |
| Breakaway torque at tightening torque 46 N·m | 63 N·m |
| Tensile shear strength (steel/steel) | 8 MPa |
| Compressive shear strength (shaft/hub) | 2 MPa |
| Thermal Properties | |
| Temperature resistance | -60 °C to +150 °C |
* All data determined under laboratory conditions at 23 °C / 50% RH. Suitability for specific applications must be verified separately.
Curing
- Initial strength: 3-10 minutes at 23 °C on phosphated steel
- Final strength: after approx. 24 hours at 23 °C
Processing
- Conditioning after cold storage (≤ 50 ml): 30 minutes
- Working life at room conditions: 28 days
- Recommended processing temperature: +5 °C to +35 °C
Storage & Shelf Life
- Shelf life unopened: 6 months (0-10 °C)
- Store in original container, cool and dry
DELO ML 5250, ML5250, ML-5250
Hazard Information (CLP)

Signal word: Warning
Hazard statements (H-phrases)
- H315: Causes skin irritation.
- H317: May cause allergic skin reactions.
- H319: Causes serious eye irritation.
- H335: May cause respiratory irritation.
Safety advice (P-statements)
Prevention:
- P280: Wear protective gloves / eye protection / face protection.
- P261: Avoid breathing vapour.
- P264: Wash thoroughly after handling.
Response:
- P304+P340: IF INHALED: Remove person to fresh air and keep comfortable for breathing.
- P312: Call a POISON CENTER or doctor if you feel unwell.
- P302+P352: IF ON SKIN: Wash with plenty of water.
- P333+P313: If skin irritation or rash occurs: Get medical advice/attention.
- P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
- P337+P313: If eye irritation persists: Get medical advice/attention.
Storage and disposal
- P403+P233: Store in a well-ventilated place. Keep container tightly closed.
- P501: Dispose of contents/container in accordance with local/regional/national/international regulations.
Other relevant information
- Hazardous ingredients: 2,2’-Ethylendioxydiethyldimethacrylate, α,α-Dimethylbenzylhydroperoxide, 2’-Phenylacetohydrazide, Maleic acid
DELO Industrie Klebstoffe GmbH & Co. KGaA, DELO-Allee 1, 86949 Windach, GERMANY, +49 8193 9900-0, [email protected], www.delo.de






Tyler G. –
Perfect from start to finish. Perfect for what I needed. Delivery faster than expected.
baptiste88 –
Very satisfied with the purchase. Highly recommended.
sarah_paris –
Been using it for 2 weeks and already see results!
Mason Z. –
Well-made product.
gabriel_s –
Great customer support. Durable product. Good quality at a fair price. Easy to assemble.
Benoît G. –
Well-made product. Excellent quality and price.
giorgia_bella –
I noticed a difference after a short time! I was skeptical, but now I’ll order regularly. Been using it for 2 weeks and already see results!
niklas88 –
Great purchase.
fabian_s –
Excellent workmanship. As expected, top-notch.
Lea –
Great product, worth every cent. No unpleasant smell, which I really appreciate. I was skeptical, but now I’ll order it regularly.
caroline_s –
I was skeptical, but now I’ll order regularly.
Maximilian –
Everything as expected. Simply excellent. Fast and courteous service. Met my expectations.
julie_75 –
I was skeptical, but now I’ll order it regularly. No unpleasant smell; I really like that.