Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape
- Product Name: Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape is typically used in formulations when high-temperature stability and dielectric strength and operating temperature, voltage, and environmental exposure must be controlled within specific ranges.
| HS Code | 356416 |
| Product Name | Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape |
| Manufacturer | Saint-Gobain Tape Solutions |
| Brand | COHRlastic |
| Model | 440S |
| Tape Type | Pressure Sensitive Tape |
| Backing Material | Silicone Rubber |
| Adhesive Type | Acrylic |
| Color | Gray |
| Total Thickness | 0.020 in (0.51 mm) |
| Temperature Range | -100°F to 500°F (-73°C to 260°C) |
| Dielectric Strength | 500 V/mil (19.7 kV/mm) |
| Tensile Strength | 1200 psi (8.3 MPa) |
| Elongation | 400% |
| Adhesion To Steel | 25 oz/in (2.7 N/cm) |
| Durometer | 50 Shore A |
| Specific Gravity | 1.15 |
| Volume Resistivity | 1 x 10^15 ohm-cm |
| Dielectric Constant | 3.0 at 1 kHz |
| Dissipation Factor | 0.001 |
| Width | 12 in (305 mm) |
| Length | 36 yd (32.9 m) |
As an accredited Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic 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 COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape is supplied on rolls in protective cartons; quantity: one roll per carton. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized cartons of Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape, secured for shipment. |
| Shipping | Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape is generally non-hazardous and not regulated by DOT, IATA, or IMDG. No UN number, hazard class, packing group, or labels required. Ship in clean, dry, protective packaging; avoid heat, moisture, sunlight, crushing, and contamination. Follow SDS. |
| Storage | Store Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape in original packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, ignition sources, moisture, dust, and incompatible materials. Maintain moderate temperature and humidity, ideally 15–30°C and 40–60% RH. Keep packaging closed, protect from physical damage, rotate stock, and follow shelf-life recommendations. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored at 70°F (21°C) and 50% relative humidity. |
In traction power converter assembly, phase busbar joints are wrapped with Saint-Gobain COHRlastic 440S tape as a dielectric barrier between adjacent copper conductors and grounded chassis surfaces. The solid silicone backing is selected for its resistance to partial discharge erosion under fast-switching voltage waveforms. The acrylic pressure-sensitive adhesive permits room-temperature placement without additional heat cure. Before application, copper contact surfaces are cleaned with reagent-grade isopropanol. Surface cleanliness is monitored by contact angle; a value above 38° indicates residual oil and requires recleaning. The tape is wrapped with 50% overlap. A hand lamination roller with a 70 Shore A rubber surface is used to remove air pockets. Entrapped air voids larger than 0.1 mm can lower voltage endurance. After assembly, the wrapped joint is tested by the OEM at 2.5 kV AC for 60 s per internal criteria. Edge sealing with a room-temperature vulcanizing silicone paste is specified at cut edges. The adhesive bondline is protected from moisture ingress because absorbed water reduces surface resistivity. Humidity exposure is qualified per IEC 60068-2-78 at 40 °C/93% RH for 21 days. Batch acceptance includes 180° peel adhesion on copper per ASTM D3330. Electrical insulation tests are compared to ASTM D149 and ASTM D257. Published data for this specific silicone/acrylic configuration is limited. Assembly-level dielectric withstand values must be verified on the complete busbar stack-up. The tape is not intended as the sole insulator for creepage and clearance distances defined in IEC 60664-1. The acrylic adhesive layer is the temperature-limiting component in this application.
| Evaluation | Standard | Assembly condition |
|---|---|---|
| Peel adhesion to copper | ASTM D3330 | 180° peel, 300 mm/min, 72 h dwell |
| Dielectric strength | ASTM D149 | oil immersion, full stack-up |
| Volume resistivity | ASTM D257 | 500 V DC, conditioned at 23 °C/50% RH |
| Humidity exposure | IEC 60068-2-78 | 40 °C, 93% RH, 21 days |
| Flame classification | UL 94 | vertical burn, backing plus adhesive |
What Process Window Governs COHRlastic 440S Masking in Arc Spray Booths?
Masking operations in arc spray booths expose the tape to grit blasting, intermittent heat flux, and high-velocity coating particles. Saint-Gobain COHRlastic 440S is used to protect machined surfaces that must remain free of metal buildup. The solid silicone backing resists cutting by fused alumina grit at 0.55 MPa nozzle pressure with 60 to 80 mesh abrasive. Peel adhesion to grit-blasted steel must be high enough to prevent edge lifting during blast exposure. The acrylic PSA is not a high-temperature adhesive. Sustained surface temperature above 120 °C to 150 °C causes progressive adhesive oxidation and residue on unmasked metal. In arc spraying, the tape is applied only to areas outside the direct plume impingement zone. Edges are sealed with a liquid silicone bead to prevent coating ingress under the adhesive. The tape is removed while the substrate remains below 80 °C. Production trials show that residue formation is influenced by substrate temperature, dwell time, and blast angle. If a spray pass requires more than 45 min of continuous exposure, a mechanical mask or silicone rubber boot is preferred. Solvent wiping with heptane is allowed before tape application. Ketone or chlorinated solvent cleaning can swell the acrylic adhesive. Residual adhesive after removal is inspected under 20× magnification and confirmed by FTIR before the part returns to the coating line. Published data for this specific configuration is limited. The process window is established on each production line by testing peel strength after grit exposure and by measuring percent adhesive transfer after removal.
Compression Set, Flange Pressure, and Outdoor Sealing Limits in Battery Enclosure Gaskets
Die-cut COHRlastic 440S parts are positioned on battery enclosure flanges before automated lid placement. The acrylic PSA holds the gasket in place during robotic assembly. The adhesive is not a substitute for mechanical compression. The gasket functions only when flange bolts apply a controlled compression of 20% to 40% of initial thickness. At compression below 15%, water ingress can occur when counterface roughness exceeds 6.3 µm Ra. Compression set is measured per ASTM D395 Method B after 22 h at 80 °C. Outdoor enclosure qualification typically includes thermal aging at 80 °C for 1000 h. If carbonate electrolyte vapors are present, the acrylic layer may swell. Immersion testing in representative fluids is performed per ASTM D471 before use. The tape is not recommended for continuous immersion in battery electrolyte without mechanical retention. In production, flange surfaces are cleaned with isopropanol and dried for 5 min before tape application. Silicone release liners are removed at controlled speed to reduce static charge. Static discharge can lift dust into the adhesive process surface. Water jet cutting is preferred over laser cutting. Laser cutting can produce a charred edge that lowers gasket compressibility and creates particulate contamination. The flange thickness after compression is controlled by a feeler gauge method at 10 measurement points per linear meter. Published data for this specific configuration is limited.
Because batch ovens cycle from ambient to 200 °C air temperature, a pressure-sensitive tape seal on the door flange must be evaluated for both adhesive holding strength and compression recovery. COHRlastic 440S is used as a replaceable door seal strip on low-pressure oven doors. The acrylic adhesive is used for positioning only. A mechanical clamp bar must be installed after the tape is placed. The silicone backing provides compression recovery when the door closes against the flange. The adhesive bondline sees high shear stress during heating because the metal door and frame expand at different rates. Thermal ramp rates above 5 °C/min amplify this shear load. Adhesive creep at elevated temperature can cause squeeze-out and seal displacement. For stainless steel doors, surface preparation includes alkaline degreasing followed by dry wiping. Priming may be required for low surface energy substrates. Adhesion to PTFE-coated flanges is not recommended because the contact surface energy is below 20 mN/m. In food-drying ovens, acrylic adhesive outgassing at elevated temperature must be evaluated before specification. If the adhesive must be continuously exposed above 120 °C, the design should include mechanical fasteners spaced at intervals no greater than 150 mm. Corner joints are butt-cut and not overlapped. Overlap joints create localized hard spots and door closure force variance. Compression recovery is measured by thickness before and after 10000 door cycles. Published data for this specific configuration is limited.
When CFRP Meets Aluminum in Airframe Seams, the Full Stack-Up Governs Flammability
Silicone solid sheeting with an acrylic transfer adhesive is applied between CFRP floor panels and aluminum airframe stringers to prevent galvanic contact and fretting abrasion. The acrylic PSA holds the strip in place during drilling and fastener installation. The installed seam must be evaluated with the adhesive included in any flammability test specimen. A backing-only test does not represent the full article. The silicone rubber backing is often qualified to FAR 25.853(a) Appendix F Part I vertical burn. The adhesive layer contributes combustible mass and may change smoke density results measured per ABD0031 or ASTM E662. Manufacturers require full stack-up qualification. Peel adhesion is measured at 23 °C and −40 °C using ASTM D3330. Low-temperature peel strength is critical because acrylic PSA becomes brittle near its glass transition. Vibration testing is performed on installed panels at cold-soak conditions. If adhesive peel strength at −40 °C is below the specified assembly shear load, mechanical retention is added. Surface preparation for aluminum includes phosphoric acid anodizing per SAE AMS 2474. CFRP surfaces require a dry wipe and may need plasma treatment to raise surface energy above 50 mN/m. The tape is not recommended for direct application to uncured or wet-ribbed composite surfaces. After fastener installation, adhesive squeeze-out is trimmed with a plastic scraper to avoid scratching the CFRP. Published data for this specific configuration is limited.
Loss Factor Measurements Remain Incomplete Without Adhesive Creep Data
Wafer handling panels and process chamber covers are subject to continuous low-amplitude vibration from vacuum pumps and linear actuators. COHRlastic 440S is applied as a constrained-layer damping strip when paired with a rigid metal face layer. The silicone backing acts as the viscoelastic damping core. The acrylic adhesive couples the strip to the panel surface. Damping performance is evaluated by measuring composite loss factor with an Oberst beam test or impact hammer frequency sweep from 20 Hz to 200 Hz. The loss factor is temperature- and frequency-dependent. The adhesive must not creep under sustained shear loads exceeding 9.8 kPa. Creep resistance is assessed by dead-weight shear testing at 60 °C for 168 h. If the panel surface is contaminated with fluorinated grease, adhesion is reduced. Cleanroom-approved solvent wiping with isopropanol is required before placement. After application, a pressure of 0.2 MPa is applied across the full tape area for 60 s using a platen press. The tape edge should be terminated with an aluminum cap to prevent peel initiation. The material is not suitable for damping applications above the acrylic adhesive service temperature. Published data for this specific configuration is limited.
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- Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic 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.
Saint-Gobain COHRlastic 440S Silicone Solid/Acrylic Adhesive Pressure Sensitive Tape is a single-side coated laminate comprising a cured solid silicone rubber backing and an acrylic pressure-sensitive adhesive. The product is manufactured as slit rolls and custom die-cut parts; standard roll configurations include 36 yd (32.9 m) lengths and widths from 6.35 mm to 914 mm. The solid silicone phase distinguishes 440S from silicone foam tapes and transfer adhesives: it provides a continuous elastomeric dielectric layer, low surface energy release, and high elongation. The acrylic adhesive is selected for room-temperature tack on stainless steel, aluminum, epoxy-coated surfaces, and polar polymer films. The practical thermal rating of the laminate is controlled by the acrylic adhesive rather than the silicone backing; continuous adhesive bond-line exposure above 177 °C is not recommended, whereas the cured silicone rubber can tolerate excursions to 260 °C.
Why is an acrylic adhesive paired with a solid silicone backing on COHRlastic 440S?
Acrylic pressure-sensitive adhesives are used on 440S because they develop high initial tack on metallic and painted substrates without the solvent reactivation or heat curing required by some silicone systems. In electrical harness taping and masking operations, the adhesive wets unprimed substrates at 15–25 °C and reduces hand-pressure dependence. The acrylic layer is applied at a controlled coat weight to the silicone backing, producing a uniform bond line without the lower peel and higher release-application force often associated with silicone PSA. However, acrylic PSA undergoes oxidative chain scission and softening above 150–177 °C, while the cured silicone rubber backing retains elastomeric integrity to 260 °C. The laminate therefore behaves as a dual-material system in which the adhesive side limits continuous process temperature, and the backing side limits dielectric, release, and elongation performance. Peel adhesion data generated per ASTM D3330 generally fall between 5.0 N/25 mm and 7.0 N/25 mm on stainless steel after 20 min dwell at ambient temperature.
Representative published values for the laminate are given below. Exact values vary with thickness, liner type, and manufacturing lot; converter qualification records should be checked before setting process limits.
| Property | Representative published value | Test method |
|---|---|---|
| Nominal total thickness | 0.51 mm | ASTM D3652 |
| Breaking strength | 6.9–8.3 MPa | ASTM D3759 |
| Elongation at break | 300–400% | ASTM D3759 |
| Peel adhesion to stainless steel | 5.0–7.0 N/25 mm | ASTM D3330 |
| Dielectric strength | 15–20 kV/mm | ASTM D1000 |
| Volume resistivity | 1×1014 ohm-cm | ASTM D257 |
| Continuous operating temperature | -73 °C to 177 °C | manufacturer published range |
| Intermittent backing exposure | up to 260 °C | manufacturer published range |
Dielectric withstand, corona resistance, and insulation aging
The laminate is applied in motor phase-lead isolation, transformer winding barriers, bus-bar insulation, and ground-wall repair. Qualification for electrical tapes follows ASTM D1000 for short-time breakdown and UL 510 or equivalent insulation-tape testing when a recognized component is required. With a nominal thickness of 0.51 mm and a dielectric strength of 15–20 kV/mm, the short-time withstand voltage is approximately 7.7–10.2 kV for a single wrap. In transformer manufacturing, the acrylic adhesive bond line is the limiting element during thermal aging; after 7 days at 180 °C, peel strength can decline measurably even when the silicone backing remains intact. For this reason, insulation engineers frequently restrict continuous winding hot-spot exposure to 155 °C unless the tape is overwrapped with a silicone-glass tape and vacuum-impregnated with varnish. Automatic taping heads with controlled tension from 5 N to 20 N reduce trapped air voids, which are the primary initiation sites for corona and partial discharge. High-humidity application above 80% RH can form condensation at the adhesive–substrate interface and lower initial peel strength.
When powder-coating and thermal-spray masking places the acrylic bond line in thermal overload
Masking operations in powder coating involve convective oven temperatures of 180–220 °C for 10–30 min. Under these conditions, the silicone backing of 440S remains mechanically stable, but the acrylic adhesive can soften to the point where edge lift initiates. Field data from batch powder-coating lines show that edge lift is most severe when the tape is applied over radii below 3 mm or when the substrate carries a fluoropolymer pre-coat. Lamination at 2–4 bar with a rubber roller improves initial contact area and delays edge lift, but the leading edge should be terminated outside the direct convection impingement zone. In thermal-spray masking, molten material at particle temperatures above 1,000 °C contacts the silicone surface only briefly; the limiting factor is heat conduction through the backing into the acrylic adhesive. Published data for this specific configuration is limited, so pretrial validation on a spare fixture is required before production use. The product is better suited to spray-paint and plasma-spray masking where the bond line remains below 177 °C.
Silicone release and heat-seal bar platforms impose flatness and adhesion limits
The cured solid silicone surface of 440S provides a low surface energy release face for splicing silicone liners, protecting heat-seal bars, and temporary placement on adhesive-coated process rolls. In splice construction, the acrylic adhesive bonds to the uncoated side of a release liner at ambient temperature without the slower tack build of a silicone PSA. On heat-seal bars, the tape is burnished with a press roller at 80 Shore A hardness to remove air pockets; the bar surface should be machined flat to Ra 0.8 µm or better. Continuous bar operation above 177 °C can char the exposed acrylic adhesive edge even when the silicone face retains release properties. The backing also resists mineral oil, water, and dilute acids, but swells in toluene and xylene. The acrylic side is sensitive to ketones, esters, aromatic hydrocarbons, and plasticizer migration from PVC or oil-filled elastomers. These incompatibilities restrict use in solvent-heavy printing rooms and in direct contact with plasticized wire jackets.
What changes when 440S replaces a silicone-adhesive tape in an existing process?
The primary operational difference is the lower continuous temperature of the acrylic adhesive and the higher room-temperature tack on polar substrates. Silicone-adhesive versions of similar solid silicone backings retain thermal performance closer to 260 °C, but exhibit lower initial tack, higher cost, and more variable release at ambient temperature. PTFE skived tapes offer superior chemical resistance and lower coefficient of friction, but their elongation and conformability around small radii are lower. Polyimide tapes provide a thin high-dielectric layer with high temperature resistance but do not have the release face or cushioning of a solid silicone elastomer. The selection matrix below summarizes typical comparative boundaries.
| Product class | Backing | Adhesive | Continuous thermal range | Typical elongation | Primary constraint |
|---|---|---|---|---|---|
| COHRlastic 440S | solid silicone | acrylic | -73 °C to 177 °C | 300–400% | acrylic adhesive softening above 177 °C |
| Silicone solid/silicone PSA tape | solid silicone | silicone | -73 °C to 260 °C | 300–400% | lower ambient tack, higher cost |
| PTFE/silicone PSA tape | skived PTFE | silicone | -73 °C to 260 °C | 100–300% | lower conformability, low elongation |
| Polyimide/silicone PSA tape | polyimide film | silicone | -73 °C to 260 °C | 40–80% | low elongation, no release surface |
| Polyester/rubber PSA tape | PET film | rubber | -40 °C to 130 °C | 80–150% | low thermal ceiling, poor solvent resistance |
Adhesive storage, substrate surface energy, and slitting constraints
Storage at 21 °C and 50% RH in sealed polyethylene bags is recommended; shelf life is typically 18 months from date of manufacture. At RH above 70%, the release liner may absorb moisture and the adhesive may become hazy. Rolls should be conditioned at 23 °C for 4 h before slitting or lamination. Clean metals with surface energy above 40 dyn/cm normally do not require priming, but polypropylene and polyethylene substrates should be corona-treated to at least 38 dyn/cm before application. Slitting tolerances for widths below 25 mm are generally held to ±0.5 mm, while widths above 100 mm are typically held to ±1.0 mm. Because the backing is elastomeric, slitting with hollow-ground rotary blades at 60–80 Shore A durometer backup rollers reduces edge drag and adhesive build-up; razor-slitting at elevated speed can generate serrated edges and liner nicks that propagate into die-cut parts.
For composite repair and temporary bagging applications, 440S has been used as a high-temperature release barrier on aluminum tooling. The bond side requires a solvent-wiped surface with roughness below 3.2 µm Ra; if the tooling surface is PTFE-coated, measured peel strength typically falls below 2 N/25 mm and mechanical clamping is required. Published data for this specific configuration is limited, so process validation on a spare tool is mandated before production release. For the same application, the silicone backing resists tearing at vacuum-bag pressures up to 50 kPa at room temperature, but hot debulk cycles above 150 °C can reduce subsequent acrylic adhesive peel strength and should be considered in scheduling.
