A die-cut gasket adds a part number, a cutting die, and an assembly step just to keep moisture out of an enclosure — and it still leaves a seam where the cut edge meets the housing. Incure’s Uni-Seal™ line replaces that with a form-in-place bead that dispenses directly onto the part and cures under UV light in seconds, spanning Shore A5 elastomers to Shore D85 rigid sealants across roughly two dozen grades built for different compression and sealing demands.

Two Hardness Families Solve Different Sealing Problems

The Shore A grades — 1366, 3301, 3339, and the 3368 family (3368, 3368B, 3368G, 3368GB) — are soft, compressible elastomers running from A01 up to A37, formulated to compress under clamp load the way a rubber O-ring or foam gasket does, delivering IP68-rated waterproofing with genuine give at the seal line. 3339, at A5–A15, is built specifically as a form-in-place gasket replacement for that application. The Shore D grades — 3203, 1348, 3618VT, 3668T, 3718F, 6213HT, 6228, 6243, 6243F, 6313B, and 6322TC — trade compressibility for structural rigidity, functioning more as a hermetic bonded barrier than a compressible seal, suited to connector potting and sensor encapsulation where the joint needs to hold its shape under pressure rather than flex. Starting grade selection with which hardness family the joint actually needs — compressible seal or rigid barrier — narrows the field before viscosity enters the decision.

Ultra-Low-Viscosity Grades Wick Into Gaps by Capillary Action

A separate cluster — 6322, the 6972 family (6972, 6972R, 6972Y), and the general-purpose 1163 — runs 80 to 500 cP, thin enough to wick into an already-assembled tight gap by capillary action rather than requiring the joint to be filled before mating. Elongation on these wicking grades is exceptionally high — 6972 and its variants reach 630%, 6322 reaches 600% — because a thin capillary-filled seal line has to flex with whatever vibration or thermal movement the joint sees without cracking. 6322R and 6972R add a red tint specifically to aid visual inspection of coverage after wicking, the same inspection logic behind Incure’s fluorescing grades below, just using color instead of blacklight.

Viscosity Spans Five Orders of Magnitude

At the thin end, 3301 runs just 30–60 cP for the lightest wicking work. At the thick end, 3368G and 3368GB exceed 1,000,000 cP — a non-sag, stay-in-place consistency built to hold a bead’s shape on a vertical surface through the entire UV exposure without slumping before cure locks it in place. 3339, at 63,000–126,000 cP, sits in between as a genuine form-in-place gasket bead thick enough to bridge gaps without running. 6322TC, at 12,000–24,000 cP, is formulated specifically as a high-viscosity gel that stays in place on a vertical face while bridging gaps up to 5mm — a narrower niche than the 3368 family’s broader non-sag range, worth specifying when the gap width is already known rather than defaulting to the thicker general-purpose grade. Matching viscosity to joint orientation — horizontal fill versus vertical or complex housing geometry — matters as much as matching hardness to compression requirement.

Email Us with your enclosure geometry, IP rating target, and whether the joint needs to compress or bond rigidly, and Incure’s engineers can confirm which Uni-Seal™ grade actually fits.

Fluorescing, Dual-Cure, and Color-Coded Grades

3718F and 6243F carry the same UV-fluorescent tracer used across Incure’s Ultra-Illumina™ conformal coating line, letting an inspector verify gasket-bead coverage under blacklight rather than by eye alone. 6313B adds a secondary heat-cure mechanism alongside UV, finishing polymerization in any shadowed geometry the lamp’s line of sight doesn’t directly reach — the same shadow-area problem that shows up on any UV-cure line running complex housing shapes. 1163’s wicking chemistry serves general electronics needle-dispensing assemblies — the same bonded-cannula category covered from the hardware side in Incure’s Sniper™ precision dispensing needle guide — where a low-viscosity wicking sealant secures the needle-to-hub joint against the fluid it dispenses.

Cure Equipment

Uni-Seal™ grades cure in the 365–405 nm UVA range, compatible with Incure’s L9000™ UV LED spot lamp, L-Series™ UV LED flood lamps, and B/C-Series™ cure chambers for enclosed batch curing of high-viscosity dam-and-fill beads.

Where the Line Fits

Electronic enclosure sealing draws on the soft Shore A elastomers for form-in-place gasketing on PCB housings and power supply covers, maintaining compression set across thermal cycles the way a die-cut gasket eventually loses. Connector and sensor potting uses the low-viscosity grades to flow into cavities and around leads for hermetic waterproofing in outdoor-rated assemblies. Automotive ECU gasketing depends on the thixotropic non-sag grades staying in place on vertical housing surfaces through the UV cure without racking time. Smartwatch and wearable waterproofing draws on the same flexible, high-elongation grades to absorb button-push deformation while holding an IP68 rating through pressure testing. Dam-and-fill work pairs a high-viscosity thixotropic grade to build a containment dam before a lower-viscosity encapsulant is dispensed inside it — a two-material technique distinct from single-shot potting. Vertical glass and loose-fit bonding on architectural and housing assemblies relies on the same non-sag behavior to eliminate fixturing during cure, a use case worth checking against Incure’s UV glass & metal bonder grade guide when the joint also needs structural bond strength rather than sealing alone.

Contact Our Team to confirm the Uni-Seal™ grade for your enclosure and compression requirement.

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