For Saint-Gobain CHR SG55-06(R) Anti-Static Glass-PTFE Backing Silicone Adhesive Pressure Sensitive Tape, the compounding addition ratio used for pelletized additives is not applicable. The process-relevant parameter is the application ratio on the substrate: the ratio of covered width to exposed width, the spiral-wrap overlap percentage, and the number of tape plies in the working interface. The scenarios in this application section report that parameter as “application ratio” for each manufacturing cell.

In selective conformal coating and wave-solder masking lines for high-layer-count rigid-flex assemblies, the glass-filled PTFE backing of the anti-static tape is used as a soldermask-over-free edge and finger guard on exposed gold contact arrays. The anti-static surface modification is functionally distinct from an insulative PTFE skive: surface resistivity falls in the dissipative range per ASTM D257-21, commonly between 10^6 Ω/sq and 10^11 Ω/sq at 50% RH, suppressing tribocharging during automated tape laydown. Compliance verification follows ANSI/ESD S20.20-2021 and IEC 61340-5-1:2016 for protected areas containing electrostatic discharge sensitive devices; the tape itself is not an ESD grounding path unless the operator bonds the exposed PTFE edge to a common point ground through a 1 MΩ bleed resistor. The application ratio on a connector edge is set at a minimum 1.5 mm of tape-to-panel overlap beyond the mask define, single-ply only, with butt joints allowed only at panel break lines. A double-layer overlap is limited to 5 mm at the end of a finger row to avoid trapping flux and creating a capillary path for solvent ingress. For reel-to-reel coverlay replacement on 18/12/18 μm copper flex, the tape edge is recessed 0.5 mm behind the polyimide coverlay edge. Die-cut strips are applied after plasma cleaning of the panel at a surface energy of at least 42 dyn/cm; the release liner is removed through a low-peel applicator maintained at 0.8–1.2 N/cm peel force. On-line automated optical inspection verifies edge position with a tolerance of ±0.2 mm. The tape remains in place through acrylic, urethane acrylate, or silicone conformal coat cure schedules at 80–125°C for 10–45 min; its silicone adhesive leaves no measurable amide-cured residue on Ni/Pd/Au surface finishes when removed in one continuous pull at 180° after cooling below 60°C. The tape is not recommended for repeated exposure to alkaline deflash media above pH 10 or for prolonged immersion in methyl ethyl ketone, which swells silicone adhesive and risks adhesive transfer. Terminal finished part categories include server motherboards, smartphone mainboards, NVMe solid-state drives, automotive ADAS radar modules, and flexible harnesses for implantable medical devices.

What changes when anti-static glass-PTFE tape replaces bare PTFE cladding on rotary seal jaws?

Continuous VFFS and HFFS lines use the discrete silicone adhesive layer of CHR SG55-06(R) to permit replacement of mechanical PTFE jaw cladding without shutdown for solvent welding or bolt placement. The anti-static face contributes to dust rejection in dry-blended powder and sugar-dust environments, but the dominant functional parameter is release from low-density polyethylene and biaxially-oriented polypropylene sealant layers at jaw surface temperatures up to 200°C. Indirect food-contact compliance for the PTFE backing is covered by FDA 21 CFR 177.1550; adhesive migration must be assessed under FDA 21 CFR 175.125 if the fractured seal area leaves exposed adhesive at pack edge. EU compliance is managed under Regulation (EC) 1935/2004, with silicone components supported by Council of Europe Resolution AP(2004)5 or national BfR recommendations where required.

A flat seal bar is covered with a single continuous strip at 100% of the transverse jaw face, extending 2 mm onto the unheated jaw body to prevent sealant creep. Round bars and crimp profiles are helically wrapped at 50% overlap, generating a two-ply wear surface in the contact zone. Material consumption factors for application ratio calculations are 1.5 for helical wraps and 1.08 for flat bars once end trimming is included. The bar is preheated to 120°C before tape application to drive off adsorbed water and reduce adhesive creep. Silicone adhesive densification is achieved with 3–4 N/cm pressure using a hand roller with 80–90 Shore A face. Once installed, dwell is restored to production setpoint of 150–190°C, and the line runs at 15–60 cycles/min for stick-pack and pillow-pack formats. Seal pressure at the jaw face ranges from 0.4–0.8 MPa for 20 μm OPP/PE laminates; the glass-PTFE backing absorbs compressive set and reduces jaw skew. Re-application intervals on flat bars are typically based on adhesive shear loss at the jaw corner, which appears as edge lift after prolonged exposure to polyethylene waxes and anti-block additives. End products include nitrogen-flushed coffee sachets, frozen vegetable pillow bags, powder drink stick packs, and pharmaceutical granule pouches with peelable laminated foil.

Unlike the stationary jaw application, a driven idler roller in a solvent-free adhesive coating line imposes a cyclic shear load on the tape edge at each revolution. Where corona-treated film webs of 12 μm PET pass at 300–500 m/min, the anti-static property is material because airborne dust adhering to the silicone layer would generate coating defects downstream. The tape is applied to nip idler rolls and lay-on rollers in the adhesive application section, not in the direct gravure cylinder contact zone. Compliance for machinery safety and explosive atmosphere prevention follows ATEX 2014/34/EU for zoned coating rooms; electrical surface resistivity is verified per ASTM D257-21, and chemical conformity is declared under REACH Article 33 SVHC communication and RoHS Directive 2011/65/EU as amended by Commission Delegated Directive (EU) 2015/863.

The application ratio on idler rollers is single-ply axial wrap covering the full roller face width plus 5 mm per edge, with a butt seam aligned at the roller hip. The seam gap is held below 1 mm; spiral wrap is not permitted because adhesive overlap alters roller runout. In idler rollers over 250 mm diameter, the tape is applied as a segmented 3-roll set with seam stagger at 120° to avoid cumulative thickness variation. Material usage factor for roll circumference plus edge trim is 1.03. The roller surface is degreased with 70% isopropanol / 30% deionized water and dried until no visible condensation remains at 15% RH; application occurs at room temperature, followed by a 60 min ambient dwell before line startup. The tape is burnished with a non-felting polyester pad at 50–80 N/cm² to wet out the adhesive. On line, the tape sees continuous service temperatures of 60–90°C from adhesive tank heat transfer; edge flagging below 0.3 mm is monitored by laser profilometry. Terminal finished part categories include solvent-free laminates for flexible food packaging, labelstock liners, architectural window films, and photovoltaic back-sheet laminates.

When epoxy prepreg release must coexist with static decay on composite cure tools

Carbon fiber reinforced polymer cure cycles using 180°C-cure epoxies place the tape at the interface between an aluminum caul sheet and the part surface. The PTFE-glass backing reduces adhesion to uncured prepreg so that the caul sheet releases without tearing or resin build-up; the anti-static layer prevents carbon dust attracted to the mold from embedding into the outer ply. Compliance for aerospace secondary structures uses SAE AMS-C-8791 for non-structural release film in auxiliary equipment, while flame propagation is assessed by FAR 25.853(a) for interior panels where the tape may be left in place, and surface resistivity is tested to ASTM D257-21. Peel adhesion of the pressure-sensitive adhesive is qualified per ASTM D3330/D3330M. Published data for this specific tape configuration on Class A tool surfaces is limited; qualification therefore uses an internal sequence of ASTM D257-21 and release peel tests rather than a prescriptive global limit. For tooling pre-preg, the tape functions not as a bagging film but as a release insert along tool flange and shear cleat edges, where silicone adhesive must not exceed 0.07 mm thickness deviation from the mean tool contour.

Application ratio on tool flanges uses full edge coverage with a single layer, 10 mm overlap onto the tool sealing plane and a 3 mm recess from the mold cavity radius. On flat caul sheets for compression molding of random-fiber thermoplastics, a 50% open area grid of 25 mm tape strips is used to control gas venting; the addition ratio is therefore 0.5 of the tool area. Multiple plies are not permitted on class A surfaces because cumulative thickness would produce surface step-down visible after painting. The tape is applied to a clean tool preheated to 40°C to maintain adhesive conformability around compound curves. Hand lamination of the prepreg stack follows; the tape does not participate in the resin flow front but does seal the outer boundary during vacuum debulk at −0.8 bar relative to atmosphere. Cure in an autoclave at 180°C for 2 hours at 6 bar does not thermally decompose the glass-PTFE mass, but silicone adhesive at the tape boundary may crosslink further and reduce subsequent peel removal. Demolders therefore cut the tape boundary with a polyimide scraper at 60°C before lifting the caul plate. Terminal components include wing leading-edge ribs, battery enclosure stiffeners, drone rotor frames, prosthetic socket shells, and snowboard structural cores.

In low-voltage servo motor stator winding, the glass-filled PTFE tape is used as a phase-to-phase interlayer where coil crossovers create an air gap subject to partial discharge and dust-induced tracking. The anti-static treatment lowers dust attraction during winding so that carbon brush wear particles do not become embedded in the coil insulation. Electrical grade verification follows ASTM D1000-17 for pressure-sensitive adhesive insulating tape and IEC 60464-2 for varnish compatibility tests; the dielectric strength of glass-PTFE is referenced by IEC 60243-1, and the final sealed winding is evaluated under UL 1446 together with the impregnating varnish. The tape is not a primary ground-wall insulation and must not replace mica or enamel wire coating.

Straight coil leads are wrapped with a 50% helical overlap with 3 mm minimum edge spacing from the stack lamination. Slot stick sections are single-layer on the bottom of the slot, while phase barrier strips are die-cut as 0.25 mm × 12 mm × 180 mm rectangles; material consumption factor is 1.5 for overlap wrapping plus 0.03 scrap. Wrap tension must not exceed 2.5 N/cm of tape width, corresponding to approximately 15% elongation of the backing; above this the glass scrim loses dimensional stability during varnish cure. After coil insertion and blocking, tape is applied before preheat at 110°C to drive off winding residues. Trickle or dip impregnation with polyesterimide or epoxy varnish occurs at 40–60°C bath temperature; the silicone adhesive remains anchored, but any exposed edge outside the lamination stack must be wiped with 30% xylene / 70% toluene to remove uncured varnish films that could form conductive char. Terminal products include servo motors, stepper motors, traction generators, wind turbine pitch motors, and railway compressor stators.

Static-decay guide rail cladding for 300 mm wafer cassettes

Three hundred millimetre wafer cassettes and reticle pods in ISO Class 5 cleanrooms use thin anti-static runner cladding to reduce particle generation and to prevent electrostatic attraction of free particles onto the cassette sidewall. The tape is applied to polycarbonate or PEEK wear rails, not to the wafer contact surface. Cleanroom compatibility is governed by ISO 14644-1:2015 for airborne particulate classes and by ANSI/ESD S20.20-2021 for static control; equipment-level safety and outgassing acceptance follows SEMI S2. Surface resistivity is verified by ASTM D257-21, and organic vapour outgassing is screened by thermal desorption gas chromatography-mass spectrometry against the equipment supplier specification.

The application ratio is single-ply lengthwise covering on the rail wear face with 2 mm edge capture into the cassette pocket wall; butt seams are located away from wafer transfer contact and gaps are held below 0.5 mm. Overlap plies are not permitted because double-ply edges create a step change in rail height that disturbs wafer centering. The cassette rails are cleaned with 70% isopropanol / 30% deionized water and dried at 50°C for 30 min; after tape application, the cassette is baked at 70°C for 60 min to reduce silicone adhesive outgassing. A subsequent orbital shake particle shedding test is performed according to the cleanroom end-user specification. Terminal finished part categories include 300 mm FOUP cassette guide rails, reticle pods, LCD photomask carriers, and carrier boxes for MEMS devices.