Wellmid2580 High Strength Epoxy Putty For 4.2K ‌LHe/77K LN

Two-Component Ultra-Low Temperature Epoxy Putty Adhesive
Wellmid2580AB is a 2K epoxy putty structural adhesive, developed for 4.2K LHE(-268.95℃), 77K LN (-196.15℃) cryogenic service and underwater repair. Moderate curing speed, ensures good substrate wetting and easy repositioning. Once cured, it has high strength, hardness and toughness, outstanding resistance to LHE/LN impact, good water & chemical resistance and underwater curability. Bonds and fills gaps on metal, glass, ceramic, concrete, certain rigid plastics and rubbers. Especially for bonding/repairing/shaping superconductor, cryogenic electrical equipment, hot/cold pipelines and tanks. Also suitable for fixture/repair of clamps and molds. Cured epoxy can be polished, drilled and machined.
Key Feature:

● Excellent gap filling capability, no cracking under cryogenic conditions

● Easy to use; knead evenly like plasticine for convenient bonding and shaping

● High hardness, superior bonding strength, suitable for bonding and sealing of various different materials

● 720-Hour cycling thermal shock test at 77K LN-RT: bonding strength slightly increased on multiple substrates

● 168-Hour continuous cryogenic shock test under 4.2K LHE: bonding strength remains stable on multiple substrates

● In-situ cryogenic shock test at 4.2K LHE condition at lab: bonding strength remains stable on multiple substrates

● Good weather resistance, water resistance and chemical resistance

● Underwater bonding and gap repair available, environmentally friendly

Surface Pretreatment

Great bonding strength and durability rely on proper surface pretreatment.

Clean bonding surfaces thoroughly with degreasing solvents such as acetone or anhydrous ethanol to remove grease, dirt and dust. Dilute alcohol, gasoline or paint thinners are not recommended for wiping.

Maximum bonding strength and durability can be achieved via mechanical sanding, sandblasting or chemical etching. A second cleaning is required after surface treatment.

Adhesive Application:

For optimal bonding performance, Wellmid 2580 Part A and Part B must be fully mixed at the specified ratio.

Two-component metal cans support long-term airtight storage, cutting waste and contamination. The included plastic cover keeps dust out after partial use, preserving product quality temporarily and boosting working efficiency.

A 0.10–1.00 mm adhesive layer can fully wet the bonding surface and achieves maximum lap shear strength. Over-thick glue layer or excessive adhesive around will not increase bond strength.

Warning:

All tools should be cleaned with hot water and soap before adhesive residues cure. Cured residues are difficult and time-consuming to remove. If solvents such as acetone are used for cleaning, proper protective precautions must be taken to prevent skin and eye contact. Used metal cans and mixing tools can not be reused.

Storage&Package:
Wellmid 2580 A & B shall be stored separately at constant RT., protected from sunlight prior to use. Maximum shelf life exceeds 36 months. Refer to label for exact expiry date.

Packaging: 750g can kit, 3oz (85.05g) can kit.