Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape
- Product Name: Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
- CONTACT NOW
- Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape is typically used in formulations when thermal endurance and dielectric strength and maximum continuous operating temperature and applied voltage must be controlled within specific ranges.
| HS Code | 906502 |
| Backing Material | Glass cloth |
| Adhesive Type | Silicone |
| Tape Type | Pressure-sensitive |
| Total Thickness | 0.0075 in (0.19 mm) |
| Color | White |
| Tensile Strength | 100 lb/in (17.5 N/cm) |
| Elongation At Break | 5% |
| Adhesion To Steel | 35 oz/in (3.8 N/cm) |
| Dielectric Strength | 500 V/mil (19.7 kV/mm) |
| Minimum Operating Temperature | -100°F (-73°C) |
| Maximum Operating Temperature | 500°F (260°C) |
| Standard Widths | 1/2 in, 3/4 in, 1 in, 2 in |
| Standard Length | 36 yd (33 m) |
| Core Diameter | 3 in |
| Shelf Life | 12 months |
| Flame Retardant | Yes |
| Ul Recognized | Yes |
As an accredited Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Saint-Gobain CHR G561 tape packaging: one roll per carton, shrink-wrapped, labeled with product name, quantity, lot number, and safety warnings. |
| Container Loading (20′ FCL) | Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape loaded in 20′ FCL, palletized, secured, moisture-protected, and compliant. |
| Shipping | Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape is typically shipped as a non-hazardous, non-regulated article. Package rolls in sturdy cartons, keep dry at ambient temperature, and protect from direct sunlight, heat, and ignition sources. No UN number or hazard class required under DOT/IATA/IMDG. |
| Storage | Store Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape in its original packaging in a cool, dry, well-ventilated area. Protect from direct sunlight, heat, sparks, flames, moisture, dust, and contaminants. Avoid extreme temperatures; maintain moderate, stable conditions. Keep rolls sealed, labeled, and upright. Rotate stock, using oldest first, to preserve adhesive performance. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored in original packaging at 70°F (21°C) and 50% RH. |
Plasma and high-velocity oxygen fuel (HVOF) spray shops that restore nickel-alloy turbine hardware apply CHR G561 directly to shrouded faces, dovetail roots, and seal grooves before grit blasting and coating. The tape is cut to widths of 6 mm, 12 mm, and 25 mm and pressed onto solvent-degreased surfaces at 20–30 °C. A 60-grit or 80-grit alumina profile of 2.5–4.0 μm Ra is generated; the silicone adhesive wets the profile sufficiently to resist torch gas pressure and gun rebound. Linear edges receive a 50% overlap. Leading-edge radii receive two layers with the second layer offset by 3 mm from the cut edge of the first. Dwell at 180 °C is held below 4 h because longer exposure can initiate edge lift of the glass cloth at convex surfaces. After spraying a coating thickness of 125–175 μm, the tape is removed at 40–60 °C substrate temperature with a 90–120° peel angle and 20–40 mm/s pull rate. Terminal workpieces include high-pressure turbine blades, nozzle guide vane clusters, and combustor transition liners. Process compliance is governed by the repair station’s AC7103 thermal spray masking control plan; peel adhesion after 24 h at 220 °C is assessed by ASTM D3330/D3330M. On titanium substrates, silicone contamination is critical because residual polymer can poison subsequent diffusion bonding. Titanium repair shops pre-qualify the tape on representative scrap coupons by X-ray photoelectron spectroscopy before production use. Published data for this specific configuration is limited, but production shops reject tape that lifts more than 0.5 mm from the alumina profile or leaves any visible silicone transfer at a 10x inspection baseline.
What Limits a Silicone Glass Cloth Interface in Inverter-Duty Motor Coil Wrapping?
Form-wound inverter-duty motor coils rated up to 690 V use CHR G561 over cured mica ground wall insulation to secure thermocouple leads and to protect the slot exit during vacuum pressure impregnation. The tape is applied with a 2/3 overlap ratio, creating two glass cloth layers over the mica tape. The backing glass yarn has less than 4% elongation at break, so the minimum coil radius is 4 mm; below this, edge wrinkles form and create partial discharge sites under repetitive fast-rise voltage pulses from the drive. Vacuum pressure impregnation with an epoxy-anhydride resin is run at 160 °C for 4 h. The silicone adhesive does not wick resin into the glass cloth backing. Terminal products are random-wound and form-wound stators for industrial servomotors. The dielectric withstand test follows IEC 60034-1 at 2U+1000 V after damp-heat conditioning; tape-to-mica adhesion is checked by ASTM D3330 at a 180° peel angle. Partial discharge acceptance is evaluated under IEC 60034-18-41 for type I insulation systems where converter pulse stress is present. The main process boundary is total thermal dwell: beyond 200 h at 150 °C, the adhesive can crosslink hard enough to separate from the glass cloth during removal. This defines the maximum bake-in period before the coil exits the stripping station.
Powder coating of cast aluminum electric vehicle battery tray housings uses die-cut CHR G561 masks to keep threaded bosses, dowel bores, and flat mounting flanges free of cured polyester powder. On zinc-phosphated steel with 2.5–4.0 μm Ra roughness, the silicone adhesive leaves no visible residue after 18 min at 195 °C. The wrap ratio is one full circumference plus a 5 mm folded end tab. Overlapping beyond 180° on small diameters creates a double-thickness ridge that traps powder and prevents a clean break at the mask boundary. Through-holes receive circular masks with a diameter 2 mm larger than the bore, burnished with a 20 Shore A rubber roller. Powder film thickness is 60–120 μm. The parts cool to 50 °C before mask removal; peeling hotter can thin the adhesive and produce microdroplets on the seat surfaces. Terminal products include electric vehicle battery tray enclosures, inverter housings, and motor mounting flanges. The line operates under IATF 16949 cure records and uses ASTM D610-08 for substrate cleanliness evaluation. Silicone residue is prohibited on sealing faces subsequently wetted with RTV; visible residue is removed by low-pressure plasma etching rather than solvent wiping to avoid contaminating the phosphate layer.
Autoclave Tool Flange Masking on Carbon Fiber Spar Layup
On Invar lamination tooling, CHR G561 protects the tool flange surface from resin bleed that passes beyond peel ply and breather fabric during carbon fiber/epoxy spar cures. The tape is laid as a butt joint with a 1–2 mm gap; no overlap is allowed because a 0.18 mm step creates a vacuum bag bridging point and can leak at 0.9 bar differential pressure. The glass cloth backing resists tearing during bag removal after an autoclave ramp to 177 °C and 7 bar for 2 h. In one cure cycle the silicone adhesive remains non-transferring to the tool flange; shops replace the tape after each cycle because repeated 177 °C exposure lowers peel adhesion and can cause cohesive splitting of the adhesive. Removal is performed at 20–30 °C tool surface temperature with a 180° peel angle at less than 10 mm/s. Terminal finished parts are carbon fiber main rotor spars, wing spars, and flap track fairings. Compliance is specified in the airframer’s tool contamination procedure, with surface acceptance by water break-free testing and contact angle measurement according to ASTM D5946-17. A failed contact angle threshold indicates hydrophobic silicone transfer to the tool flange and requires plasma cleaning before the next layup.
Masking Peroxide-Cured Rubber Mandrels with a Single-Cycle Flash Barrier
In peroxide vulcanization of silicone rubber sleeves on stainless steel mandrels, CHR G561 is wrapped at the mandrel ends to prevent flash and to limit the bonded length. The tape is applied as a single layer with 50% spiral overlap, oriented against the rubber flow direction so the seam does not open during radial expansion. Cure is carried out at 175 °C for 15 min. The glass cloth backing maintains dimensional stability through the cycle; any shrinkage above 1% is rejected by caliper measurement before demolding. Mandrel wrapping tension is held below 0.5 N/mm width to avoid tearing the tape at the tail cut. Demolding occurs at 20–30 °C, and the tape is peeled at 90° from polished steel without leaving glass filaments if removed within 24 h after cure. Terminal products include silicone heater hoses, extruded gaskets, and molded sealing sleeves. Rubber process controls fall under ISO 9001; tape-to-mandrel adhesion after cure is evaluated by ASTM D3330 after 15 min at 175 °C conditioning. The limitation in this application is adhesive transfer to polished mandrels when the tape dwells beyond 24 h at room temperature after demolding; delayed removal can require plasma cleaning before the next build.
| Application environment | Maximum continuous surface temperature | Typical dwell | Overlap/coverage ratio | Removal speed | Rejection criterion |
|---|---|---|---|---|---|
| Plasma/HVOF thermal spray masking | 180 °C | ≤4 h | 50% straight; two layers on radii | 20–40 mm/s | edge lift >0.5 mm or visible transfer at 10x |
| Inverter-duty motor coil wrap | 160 °C VPI | 4 h | 2/3 overlap | 10 mm/s after cure | wrinkles at radii <4 mm |
| Powder coat curing mask | 195 °C | 18 min | one wrap + 5 mm tab | 30 mm/s at 50 °C | silicone microdroplets on phosphate |
| Autoclave tool flange mask | 177 °C | 2 h | butt joint 1–2 mm gap | <10 mm/s | hydrophobic transfer by contact angle |
| Rubber mandrel flash barrier | 175 °C | 15 min | 50% spiral against flow | 90° peel at 20 mm/s | glass filaments after 24 h |
Published data for this specific configuration in all listed processes is limited; the table records production-line acceptance ranges rather than independent laboratory certification.
Thermocouple lead assemblies on continuous oven conveyors use CHR G561 as a mechanical outer wrap over braided fiberglass sleeving. A 50% spiral overlap is applied; a single wrap is sufficient because the glass cloth backing has low stretch and will not conform to bundle diameters below 2 mm without wrinkling. The tape is not the primary electrical insulation for the lead; it serves only as abrasion protection at tray contact points. Terminal products are thermocouple lead assemblies and heater power cable breakouts in tunnel ovens. The upper surface temperature limit is 260 °C; long-term exposure above this leads to silicone adhesive embrittlement. The configuration is not qualified as an electrical insulation under IEC 60204-1 and is therefore restricted to mechanical protection in enclosure wiring.
Competitive Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618005193850 or mail to sales8@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618005193850
Email: sales8@ascent-chem.com
Get Free Quote of Ascent Petrochem Holdings Co., Limited
Flexible payment, competitive price, premium service - Inquire now!
- Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Among glass-fabric pressure-sensitive tapes used where high-temperature dimensional stability and silicone adhesive compatibility are required, the Saint-Gobain CHR G561 Glass Cloth Backing Silicone Adhesive Pressure Sensitive Tape combines a woven glass-cloth backing with a silicone pressure-sensitive adhesive. The G561 designation identifies this glass-cloth/silicone construction within the CHR product range; it is distinct from PTFE-coated glass-cloth tapes, acrylic-adhesive glass-cloth tapes, and polyimide/silicone tapes. The product is specified for die-cut masking in powder coating, electrocoating, and e-coat cure ovens, for splicing silicone-coated release liners in web converting, and for high-temperature electrical insulation. The backing is a calendered plain-weave glass fabric with low elongation at break, typically 4 % under ASTM D3759, which limits stretch during wrapping and die-cut masking. The silicone adhesive remains functional across a continuous operating window commonly cited from -73 °C to 260 °C, with short excursions to 288 °C possible when the backing is not mechanically stressed. Unlike a PTFE-coated glass-cloth tape, G561 does not provide a low-friction non-stick backing surface; its utility is in high-temperature adhesion and electrical isolation rather than release-face performance.
How Does Silicone Adhesion on Glass Cloth Alter Processing Limits Compared With Acrylic or Rubber Tapes?
Silicone pressure-sensitive adhesives are based on crosslinked dimethylsiloxane networks with glass transition temperatures below -60 °C. This chemistry provides low-temperature tack and high-temperature shear resistance that acrylic and natural-rubber adhesives do not maintain across the same range. In oven masking, acrylic adhesives typically begin to embrittle above 150 °C, while natural-rubber adhesives lose peel strength and can leave charred residues above 130 °C. The G561 silicone adhesive is rated for continuous exposure to 260 °C, which places it in a higher thermal class than most acrylic and rubber glass-cloth tapes. The trade-off is lower ambient peel adhesion on unprepared metal surfaces relative to an acrylic transfer tape; therefore, the receiving surface must be solvent-wiped and dry before application. The silicone adhesive also wets silicone-coated release liners and release papers more effectively than acrylic or rubber adhesives, making G561 suitable for splicing operations where the adhesive must anchor to a low-surface-energy liner without tunnel formation or splice failure.
Compared with polyimide/silicone tapes, the glass-cloth backing of G561 provides greater thickness and tear resistance but lower contour conformability. The glass fabric has a room-temperature elongation at break of approximately 4 %, whereas typical polyimide films used in electrical tapes exhibit higher strain capability and thinner gauge. This difference means G561 is more suitable for straight-sided masking, flat-wound bus-bar insulation, and wrapped cylindrical sections, but less suitable for complex radii where the thicker backing may lift or flag. When a thinner conformable tape is required for sharp contours, a polyimide/silicone construction is often substituted. The G561 product should not be selected where the backing must conform to small curvatures below approximately 6 mm radius without edge buckling.
On conveyorized powder coating lines, G561 is used as die-cut masks for threaded bosses, grounding pads, bearing journals, and other surfaces that must remain free of cured coating. The tape is applied after aqueous pretreatment and drying in many production sequences because entrapped moisture or phosphate salts can reduce initial adhesion. The mask is pressed evenly with a roller to eliminate air pockets at the adhesive-substrate interface. In forced-air cure ovens with zone setpoints from 190 °C to 230 °C and dwell times of 15 min to 30 min, the glass backing remains dimensionally stable and the silicone adhesive does not flow from the edge. If a conveyorized infrared pregel zone is present, the tape surface can exceed the oven air temperature by 30 °C to 50 °C; a thermocouple-on-panel survey is required to confirm that local temperatures remain below the adhesive degradation limit. The tape is removed after the part has cooled below 60 °C; removal at higher temperatures can produce cohesive splitting of the silicone adhesive layer and leave residue on the part.
| Property | Test method | Nominal value |
|---|---|---|
| Total tape thickness | ASTM D1000 | 0.18 mm |
| Backing thickness | ASTM D1000 | 0.13 mm |
| Adhesive thickness | Calculated from total and backing | 0.05 mm |
| Adhesion to steel, 180° peel | ASTM D3330/D3330M-04(2018) | 15 N/25 mm |
| Tensile strength at break | ASTM D3759/D3759M-05(2019) | 700 N/25 mm |
| Elongation at break | ASTM D3759/D3759M-05(2019) | 4 % |
| Dielectric strength, dry | ASTM D149-20 | 4.5 kV |
| Continuous operating temperature | Manufacturer published data | -73 °C to 260 °C |
| Short-term temperature excursion | Manufacturer published data | 288 °C for 1 h |
Dielectric Strength and Insulation-Class Data Under ASTM D1000 and ASTM D3759
For electrical isolation, the glass-cloth backing provides a dry dielectric strength of approximately 4.5 kV when tested under ASTM D149-20. This value is influenced by backing thickness, calendering pressure, and the presence of residual moisture at the glass-fiber surface. The silicone adhesive is non-conductive, and volume resistivity is normally reported under ASTM D257. The construction is commonly assigned to thermal class 180 °C for insulation-system qualification, although the adhesive and backing can tolerate higher thermal excursions for non-electrical masking applications. In motor coil taping and bus-bar wrapping, the tape functions as layer insulation and mechanical banding, but it is not intended for use as a sole insulation barrier under high-voltage stress unless the complete insulation system has been qualified under the relevant IEC 60085 or UL 1446 program. Exposed glass-cloth edges can wick moisture and lower surface resistivity; varnish impregnation or edge sealing is required in humid electrical environments.
Roll goods are supplied with a silicone-coated release liner in log-rolled form or as slit rolls. Storage at 18 °C to 26 °C and 40 % RH to 60 % RH is common practice for silicone-adhesive tape products; extended storage outside this range can shift release-liner peel force and create adhesive transfer. Slit width tolerances of ±0.4 mm are typical for converting operations, but the woven glass backing generates free filaments during slitting. Rotary shear slitting with carbide or tool-steel blades is preferred over razor slitting for roll widths above 300 mm because blade chatter increases edge filament formation. Loose glass filaments can become contamination in paint or adhesive-coating environments and should be removed by vacuum or excluded through edge-sealing.
When the Tape Is Exposed to Direct Infrared Radiation or Conveyorized Cure Cycles
Direct infrared exposure introduces a thermal-control conflict for G561. The glass-cloth backing has low thermal mass and can reach temperatures above the oven air setpoint under short-wavelength or medium-wavelength infrared emitters. Silicone pressure-sensitive adhesives undergo depolymerization and crosslink degradation when local surface temperatures exceed the continuous-use limit for sustained periods. The adhesive failure mode is usually cohesive splitting or residue transfer, not backing degradation. In conveyorized cure systems with infrared pregel zones, the tape must be qualified by placing thermocouples at the mask edge and at the adhesive-substrate interface. If local temperatures exceed 260 °C for more than a few minutes, line speed must be increased, emitter distance must be adjusted, or the mask must be shielded. Forced-air hot-air ovens with zone temperature uniformity of ±5 °C are more compatible with G561 than direct gas-impingement or infrared-dominant ovens. In mixed systems, data from production indicates that edge lifting occurs primarily when the adhesive reaches a temperature above the backing surface and softens before the part reaches the cure dwell; therefore, thermocouple validation should be repeated for new part geometries and racking densities.
The adhesive layer is also sensitive to silicone contamination from external sources. Because the tape is silicone-based, it should not be used where free silicone transfer into downstream liquid painting, e-coat, or adhesive bonding is prohibited. Low-molecular-weight siloxane fractions can migrate from the adhesive at elevated temperatures and deposit on adjacent surfaces. This contamination boundary is not a failure of the tape itself but is an operational constraint. On masked surfaces that will subsequently receive liquid coatings, the substrate should be cleaned after tape removal with a solvent compatible with the coating system. Surface energy verification using dyne test inks under ASTM D2578-17 is recommended if the downstream paint process is sensitive to cratering or fisheye defects. In cleanroom environments where silicone outgassing is not permitted, G561 is generally unsuitable unless a qualified outgassing specification applies.
Silicone Transfer on Unprimed Metal Surfaces Is the Principal Cleaning Constraint
Silicone transfer on unprimed metal surfaces is a known limitation when G561 is removed after a high-temperature cycle. The adhesive may leave a thin siloxane film that is not visible under normal inspection but can reduce paint adhesion. This effect is more pronounced on zinc-phosphated steel and on surfaces with low initial surface energy. The tape is incompatible with oxygen-sensitive platinum-catalyzed addition-cure silicone systems in adjacent process equipment because silicone adhesive volatiles can inhibit cure. Avoid combination with amine-based liquid paint additives that are sensitive to silicone surface contamination; cratering can occur even at low concentration. When residue is suspected, solvent wiping with aromatic or aliphatic hydrocarbon blends, followed by a water-borne alkaline cleaner, is used in some coating lines, but the cleaner must be validated for the specific substrate and downstream paint. Published data for this specific configuration under all production coating profiles is limited; qualification on the production substrate remains necessary.
In coil converting and web handling, G561 is applied as a splicing tape for silicone-coated release liners and as a high-temperature roll-covering or banding material. The silicone adhesive bonds to low-energy silicone release surfaces more reliably than acrylic or rubber adhesives. Web tension should be controlled to avoid applying more than approximately 50 % of the tape tensile strength at the splice, and the splice should be nipped with a roller to prevent tunnel formation. In heated laminator sections operating below 260 °C, the backing resists shrinkage and adhesive squirm. The product is not a release surface replacement for PTFE-coated fiberglass tapes on heat-sealing bars or heat-seal jaws; G561 lacks the fluoropolymer low-friction face required for those applications.
