PV module bonding materials

Selection considerations

Where bonding sealant goes on a module line

Silicone sealant does two jobs in module assembly: it fills the frame channel so the laminate is bonded and sealed into the aluminium frame, and it fixes the junction box to the back of the module. On the frame side, the framing class covers the machines that handle it, such as the HORAD module framing system, the frame-corner pressing station that pushes glue into the joints and the robotic corner cleaning station that wipes off the squeeze-out. On the box side, a back-panel junction-box bonding dispenser lays the bead and a junction-box mounting station places the box. The curing-stage module handling system then gives the sealant time to set before testing. These stations come from Suzhou HORAD New Energy Equipment, and the whole sequence belongs to module assembly.

The listed sealant

JS-606 PLUS PV frame and box bonding sealant from Hangzhou Zhijiang Silicone Chemicals is an oxime-cure silicone sold for bonding aluminium frames and junction boxes. Oxime silicones cure with moisture from the air, so humidity and temperature in the curing area affect how quickly modules can be handled and tested.

Zhijiang supplies box potting from its JS-1184 family instead. Potting belongs to PV junction-box potting materials and is dispensed on equipment such as the AB junction-box potting station, so plan the two materials and their dispensers as separate purchases.

What to prove before production

Adhesion data and lot certificates are explained in qualifying PV module materials. Write down each joint and the surfaces it touches: anodised frame, glass edge, backsheet or back glass, and the plastic of the junction-box components. Adhesion depends on each pairing, so trial them one at a time.

Get the current grade sheet and safety documents, then prove surface preparation, dispensing, cure and adhesion under logged production conditions, including line speed and the time between dispensing and joining. Peel or pull checks on trial parts show whether the bond fails in the sealant or at the surface. Damp-heat and cycling runs in environmental test equipment show how the joint ages. Ask Zhijiang to confirm in writing which substrates and primers the grade is approved for, and log each sealant lot against the modules it went into, as the guide to line traceability describes.

Plan the equipment scope

Identify the production step, cell or module format and output unit before comparing equipment. Use the listed source, scope and specifications to prepare a configuration-specific enquiry. Missing values are left unspecified and do not count as exact filter matches.

Read equipment buying guides or prepare a sourcing brief.