Rubber and flexible tubing are the hardest things to bond well on a device line. The surface is low energy, the part moves, and a rigid thin-film adhesive cracks off the first time the tube flexes. Incure Cyro-Weld™ CM-800 is a medium-high-viscosity grade formulated for rubber-to-substrate and flexible-component bonding on external and disposable devices.
Bonding Things That Bend
Tubing sets, strain reliefs, gaskets, and grip overmolds all present the same challenge: the joint has to survive repeated flexing without the adhesive delaminating from the elastomer. A higher-viscosity grade helps by staying on the surface instead of wicking away, building a fillet that wraps the joint, and forming a thicker bond line that tolerates a little movement. CM-800 also bonds a wide substrate range, so a single grade covers rubber-to-plastic, rubber-to-metal, and cloth-to-plastic joints.
CM-800 is a single-component grade in the Cyro-Weld™ CM series. It is formulated to meet ISO 10993-5, ISO 10993-10, and ISO 10993-11 for biological safety, and is intended for external, disposable, and wearable components rather than implanted parts.
Incure Cyro-Weld™ CM-800 at a Glance
- Chemistry: single-component, room-temperature-cure cyanoacrylate
- Viscosity: medium-high, for control on vertical surfaces and gap filling
- Substrates: cured rubbers, foam rubbers, flexible tubing, rigid plastics, metals, cloth
- Bond strength: up to roughly 3,900 psi on suitable rigid substrates
- Biological safety: formulated to meet ISO 10993-5, ISO 10993-10, and ISO 10993-11
- Sterilization: compatible with validated ethylene oxide and gamma processes; confirm with Incure
Where CM-800 Fits
- Tube-to-fitting joints: bonding flexible tubing onto molded connectors and barbs on disposable sets
- Strain reliefs: securing molded or elastomer boots to housings at cable and tube exits
- Gasket and seal bonding: fixing elastomer seals structurally rather than just tacking them
- Grip and bumper attachment: bonding elastomer grips to rigid instrument bodies
Process Control for Elastomer Joints
Many cured rubbers carry mold-release or bloom on the surface that has to be removed by wiping or light abrasion before bonding. Some elastomers, such as EPDM and silicone, bond poorly to cyanoacrylate even when clean and need a primer or a different chemistry, so test the actual compound. Dispense the adhesive onto the rigid part, seat the flexible part, and hold until fixtured. For tube joints, a full ring of adhesive and a fillet at the tube end resist the peel force that flexing applies. Keep humidity between 40 and 60 percent.
For a broader look at choosing an adhesive by viscosity and load, see matching adhesive grade to viscosity and tensile requirement, and for dissimilar stiff-flexible pairs review how CTE mismatch causes adhesive bond failure.
Storage, Shelf Life, and Handling
Store unopened CM-800 refrigerated at 2–8°C and warm each bottle to room temperature before opening to keep condensation out of the container. Reseal after every use, keep the air headspace low, and use within the opened shelf life on the label. Rotate stock first-in-first-out and record lot numbers in the device history record. Dispense in a ventilated station with nitrile gloves and eye protection, and keep water and activator on hand to cure spills before cleanup.
Screening an Elastomer for Bondability
Before an elastomer joint goes into a design, run a quick screen. Clean a sample of the actual compound, bond a simple lap or peel coupon with CM-800, cure fully, and pull it. If the rubber tears, the pairing works. If the adhesive peels cleanly off the elastomer, try light abrasion and a solvent wipe, then a primer, and retest. Butyl, EPDM, and silicone frequently fail this screen and need a primer or a different chemistry. Doing the screen early prevents committing to a tube or seal material that cannot be bonded reliably in production.
Validation
Incure provides ISO 10993 summaries, technical data sheets, and sterilization guidance for your device file. The finished-device manufacturer owns the biological evaluation. Qualify tube and seal joints with a flex-fatigue and pull-off protocol on aged, sterilized production parts, since elastomer surface condition varies by lot and by molder.
For help bonding a specific tubing or elastomer compound, Email Us with the material spec and joint geometry.
Frequently Asked Questions
Q: Will CM-800 bond silicone tubing?
A: Silicone is difficult for cyanoacrylate. It needs a primer or an alternative chemistry. Test the actual compound before designing it in.
Q: How does it handle vertical and overhead joints?
A: Its medium-high viscosity resists running, so it holds position on non-horizontal surfaces during the hold time.
Q: Is it strong enough to be the only thing holding a tube on?
A: For many flexible tubing sets, yes, with a full adhesive ring and fillet. Validate against the maximum pull and pressure the joint will see.
A multi-substrate medical instant adhesive that handles rubber and flexible parts keeps tubing and seal assembly on one qualified grade. Incure Cyro-Weld™ CM-800 does that with a broad biological-safety data package. Contact Our Team to request samples and technical data.
Visit www.incurelab.com for more information.