Saint-Gobain Chemlam SGC6-06 Copper Adhesive Tape is a single-coated copper foil tape constructed with a nominal copper carrier thickness of 0.06 mm. One side of the foil carries a pressure-sensitive adhesive; the opposite surface remains a continuous metallic conductor for shielding, grounding, and electrical contact applications. The product is specified in electromagnetic interference suppression, enclosure seam shielding, low-current circuit prototyping, transformer and coil shielding, and similar tasks requiring a formable conductive foil with a controlled adhesive bond.

The SGC6-06 designation is associated with a silicone pressure-sensitive adhesive system and a 0.06 mm copper foil carrier. The foil thickness distinguishes the product from lighter copper foil tapes, which commonly fall between 0.035 mm and 0.045 mm, and from heavy-gauge foils above 0.10 mm. The heavier carrier improves tear resistance during rotary die cutting and reduces fold creasing in converted parts. It also restricts conformability around radii below approximately 2 mm, a boundary relevant when the tape is wrapped over cable shielding or curved enclosure edges.

Published data for the complete SGC6-06 construction should be obtained from the manufacturer’s technical data sheet. Values reviewed for copper foil adhesive tapes include total thickness, peel adhesion to stainless steel under ASTM D3330/D3330M, breaking strength and elongation under ASTM D3759/D3759M, and surface resistance under ASTM D257 or ASTM D4496. Publicly available independent test reports for this specific configuration are limited; specification submissions should therefore rely on lot-level certificates of analysis rather than generic datasheet values.

What Distinguishes SGC6-06 from Aluminum and Tin-Plated Copper Foil Tapes?

In electromagnetic compatibility work, the choice among copper, aluminum, and tin-plated copper foil tapes is governed by direct-current resistance, corrosion compatibility, and conversion behavior. The SGC6-06 copper carrier provides a lower-resistance path in a given part footprint than a typical aluminum foil tape of similar thickness. Bulk annealed copper conductivity at 20 °C is approximately 5.96×10⁷ S/m, while aluminum grades range near 3.5×10⁷ S/m. Tin-plated copper foil uses a copper core for conduction and a tin surface layer for oxidation resistance and improved contact stability.

A comparison with aluminum foil tape begins from bulk resistivity. Because rolled aluminum has higher volume resistivity than copper, a thicker or wider aluminum tape is necessary to achieve the same direct-current resistance per unit length. In alternating-current shielding applications, the copper carrier also reduces conductor loss; however, seam contact resistance frequently dominates shielding effectiveness above 100 MHz. The tin-plated copper alternative is preferred when the application requires stable surface contact resistance after humidity aging, but the tin layer adds a dissimilar metal interface that must be evaluated in solder-reflow or high-temperature bonding processes.

Surface preparation is the dominant variable in production-line peel-adhesion variation. Clean substrates with high surface energy promote adhesive wetting, while mold-release residues, plasticizer migration, and finger oils create weak boundary layers. For SGC6-06, acceptable surface preparation generally includes a solvent wipe with isopropyl alcohol or a 70:30 isopropanol-to-water mixture, followed by a lint-free polyester cloth and full evaporation before tape application. Peel adhesion is measured in accordance with ASTM D3330/D3330M using a stainless steel panel, a 2 kg roller, and a 300 mm/min peel rate unless the manufacturer specifies different parameters. Silicone pressure-sensitive adhesives typically exhibit lower initial tack than acrylic systems but retain peel adhesion after 24 h dwell; published SGC6-06 values should be read from the technical data sheet.

Silicone adhesive systems are specified for thermal cycling because they maintain a broad operating window and resist softening at elevated temperature. Acrylic adhesive copper tapes often fail at temperature extremes where silicone systems remain bonded, but silicone adhesives may be more expensive and can leave silicone residue if repositioned after long dwell. The SGC6-06 product should be applied with uniform pressure from a hard rubber roller or pressure-controlled laminating head to exclude air channels along the adhesive interface. On rough cast-aluminum surfaces, a conformable adhesive layer reduces void formation; however, deep surface pores below the foil plane can still create parasitic capacitance paths across the bonded joint.

Seam Shielding Efficiency in Enclosure Gaps

The closure of a seam introduces a frequency-dependent impedance path that can degrade shielding even when the copper carrier has adequate absorption loss. At 1 GHz, the skin depth of copper is approximately 2.06 µm; a 0.06 mm foil therefore represents roughly 29 skin depths. Absorption loss in the carrier is not the limiting factor. Aperture leakage and seam contact resistance control practical shielding. The tape functions as a conductive bridge across the seam, but the bridge is effective only if the adhesive and foil maintain compressive contact with the mating surfaces.

Measurement of shielding effectiveness across taped seams is typically performed under IEEE 299 or MIL-STD-285 methods for enclosures. Direct-current grounding resistance across tape seams is assessed with a four-wire Kelvin method to avoid lead-resistance error. Because the copper surface oxidizes over time, contact resistance can rise if the bonded joint is exposed to sulfur dioxide, high humidity, or thermal cycling. In such cases, a tin-plated copper tape or an overcoat is preferred. SGC6-06 copper foil without surface passivation should not be assumed to retain low contact resistance in outdoor or condensing environments.

When copper is adhered to aluminum substrates, the galvanic relationship must be reviewed. Copper is cathodic to aluminum; in the presence of moisture and chloride ions, the aluminum substrate may corrode sacrificially. Salt-spray testing under ASTM B117 or cyclic corrosion testing under IEC 60068-2-52 can expose acceleration at the tape edge. The SGC6-06 product is not recommended for direct bonding to untreated aluminum in marine or high-condensation environments unless the joint is overcoated, electrically isolated, or protected by a non-conductive primer. For long-term outdoor enclosure shielding, tin-plated copper foil or an additional inhibition treatment is usually more stable.

When Galvanic Compatibility Governs Substrate Selection

Galvanic corrosion occurs when dissimilar metals are electrically connected and wetted by an electrolyte. In a copper-to-aluminum joint, the aluminum acts as the anode and can corrode at the tape perimeter or at scratches in the aluminum surface. The effect is particularly severe in chloride-bearing conditions such as coastal exposure, road-salt runoff, or industrial cooling air. The electrochemical potential difference between copper and aluminum is large enough that even small exposure areas can produce visible aluminum pitting. When SGC6-06 is applied to an aluminum enclosure, the cut edges of the copper carrier form active galvanic cells if condensation is present.

Mitigation options include sealing the taped joint with an insulating conformal coating, specifying a tin-plated copper tape, or isolating the copper from the aluminum with an intermediate non-conductive layer. The tape itself cannot interrupt the galvanic couple if the copper edge remains exposed and the adhesive is not designed as a corrosion barrier. Compliance testing for corrosion resistance is not automatically covered by pressure-sensitive tape standards; therefore, end-use qualification should include salt-spray or mixed-gas testing relevant to the enclosure environment.

Because the release liner is removed under low-humidity conditions, static discharge can occur during high-speed tape application. The copper foil is conductive, but the silicone adhesive and the liner may be insulative. Production cells that convert SGC6-06 into die-cut parts should use electrostatic-discharge workstations and ionizing bars where liner speeds exceed 10 m/min. Static discharge can cause liner jamming, adhesive transfer, and operator-level safety concerns on automated laminating lines.

Die Cutting, Slitting, and Release Liner Interaction

For a 0.06 mm copper carrier, rotary die cutting requires close blade clearance. Copper work-hardens at the cut line, and excessive clearance produces edge burrs that can bridge the adhesive gap in folded seams. Maintaining die blade clearance below approximately 10% of carrier thickness reduces burr formation in converting practice for rolled copper foils. Hardened tool steels are used to limit blade wear, and regrinding intervals are shorter than those for polymer film tapes. Slitting of the master roll is performed with minimum tension to avoid curl; a curled tape can lift at the ends of a straight seam and reduce contact area.

Release liner selection affects flatness and unwind force. High-silicone-coated liners minimize adhesive transfer but may increase the risk of liner delamination if the liner is too thin for wide rolls. For die-cut parts, liner thickness below 50 µm can produce dimensional instability during cutting. The SGC6-06 construction should be stored in its original packaging at approximately 21 °C and 50% relative humidity. Storage above 30 °C or above 60% relative humidity can accelerate adhesive softening, liner blocking, and copper surface oxidation. Shelf life should be taken from the manufacturer’s lot documentation; typical silicone tape shelf life is 12 to 24 months under controlled conditions.

Compliance documentation for SGC6-06 should include RoHS confirmation under Directive 2011/65/EU, REACH SVHC declarations under Article 33, and, where relevant, UL 510 recognition for adhesive tape constructions. Copper metal is not listed as a restricted homogeneous material under RoHS Annex II, but compliance depends on impurity levels in the copper foil and adhesive. Lead and cadmium in raw materials must be verified by lot documentation. For vacuum or space applications, silicone adhesives can release volatile condensables; ASTM E595 total mass loss and collected volatile condensable materials should be requested when outgassing is critical. Published outgassing data for the specific SGC6-06 configuration is limited outside the manufacturer’s controlled testing program.