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…