Application of Saint-Gobain CHR SG33-03(R) Industrial Glass-PTFE Backing Acrylic Adhesive Pressure Sensitive Tape
At the interface between a heated impulse sealing jaw and a 30–60 µm LLDPE or cast polypropylene sealant layer, direct metal-to-film contact produces stochastic seal thinning because of local temperature overshoot; the jaw surface cycles from ambient to 110–160°C within 1–3 s and then falls during air-cooled dwell. Saint-Gobain CHR SG33-03(R)-class glass-PTFE acrylic pressure-sensitive tape is installed as a thermal barrier and release plane on the jaw face, with the acrylic adhesive laminated to a solvent-wiped metal surface at 15–30°C using roll-down force of 20–50 N per 100 mm tape width. The application ratio for this process is 100% jaw-face coverage with a single backing layer and butt joints; lap joints are excluded because the 0.084 mm nominal backing step imprints the seal. For this class, the adhesive layer is typically 0.050 mm, giving a total caliper near 0.130 mm and an adhesive-to-backing thickness ratio of approximately 0.6:1; published data for the specific SG33-03(R) SKU should be confirmed with ASTM D3652/D3652M-20 thickness measurements on a release-lined sample. The acrylic bond line is limited to 149°C continuous service, although the PTFE-impregnated glass backing can tolerate intermittent jaw temperatures up to 260°C without carbonization. Compliance anchors include FDA 21 CFR 177.1550 for the PTFE non-stick surface as a functional barrier on food-contact packaging machinery, EU 1935/2004 Article 3 for overall migration, and RoHS Directive 2011/65/EU for the sealing equipment electrical components. Terminal finished product groups include pillow pouches for confectionery, frozen vegetable flow packs, medical device header bags, and stand-up snack pouches with lap or fin seals.
How Does a Glass-PTFE Backing Survive Solenoid Coil Winding Stress?
The use of a pressure-sensitive glass-PTFE tape in solenoid and fractional-horsepower motor insulation is governed less by tensile strength than by dimensional stability under winding tension and resistance to cut-through when magnet wire is pulled over the pre-wound layer. Coil winders equipped with dancer-arm or magnetic-particle tension control typically set tape tension between 1.0 N and 2.5 N per 10 mm width; the tape is spiral-wound with a 50% overlap, producing two backing layers over the conductor at the slot section and a single layer at the crossing point. This overlap ratio is the practical application proportion; a 2:1 wrap ratio is selected because it prevents adhesive-to-adhesive blocking during the 130–150°C varnish bake. The acrylic adhesive used in SG33-03(R) is suitable for short-term exposure at 150°C; above this limit, outgassing may form blisters under the backing and reduce dielectric integrity. The glass-PTFE backing is evaluated under ASTM D4969-17 Table 1 for coated glass fabric tape, while dielectric breakdown per ASTM D149-20 on a single layer for products in this thickness class is typically above 5 kV, though batch-to-batch scatter depends on PTFE impregnation level and backing thickness. Compliance references include UL 1446 for electrical insulation system compatibility, ASTM D257-14 for insulation resistance, and REACH Regulation (EC) No 1907/2006 for adhesive substances. The terminal component types are solenoid coils for hydraulic valves, stator slot liners in small universal motors, transformer interlayer insulation, and high-temperature appliance heater harness wraps.
Autoclave Vacuum Bag Flash-Tape Release Boundaries
Open-mold carbon fiber epoxy laminating often leaves resin flash on tool flanges, where cured epoxy develops tenacious bonds with aluminum or steel. A polyester or nylon vacuum bag is placed over the preform; release tape at the flange separates the breather and sealant from the part. The glass-PTFE tape is applied to stripped and solvent-wiped tool steel at 18–28°C with a single layer and zero overlap; where long flanges require multiple sections, a 5 mm gap is left between strips rather than lapping, because the 0.084 mm step creates a resin channel that detaches the bag edge sealant. The application ratio is one adhesive layer per flange segment, with roll-down force of 30 N per 25 mm width; no release liquid is added in the flange zone, which avoids transfer of silicone contamination to the laminate. The acrylic adhesive must remain bonded during the 4–8 h infusion at 25–40°C and during a post-cure ramp; if the tool enters an oven above 120°C for more than 2 h, the acrylic bond line may soften and permit bag-side sliding, so thermocouple placement on the flange is used to confirm adhesive-side temperature. Standards include ASTM D3330/D3330M-04 Method A for 180° peel adhesion after thermal aging, ASTM D4969-17 for the backing construction, REACH Regulation (EC) No 1907/2006, and RoHS Directive 2011/65/EU for tooling components. Terminal products include carbon fiber bicycle frames, drone airframe skins, automotive CFRP hood prototypes, and wind turbine blade trailing-edge panels.
On stainless steel rollers in baked-snack processing lines, deposits of sucrose, starch, and lipid mixtures create a surface energy problem: the deposited film changes from a thin lubricating layer to a carbonized residue at roller temperatures above 150°C, causing web tracking drift and product marking. To interrupt this deposit cycle, a glass-PTFE fabric tape with an acrylic pressure-sensitive adhesive is applied to the roller shell and side plates at a coverage ratio of 100% on the product-contact face; for 100 mm diameter rollers, the tape is applied in a spiral with a 3 mm butt gap to allow thermal expansion of the steel without buckling the backing. The adhesive side is laminated at 20–35°C with an 80-durometer silicone roller at a linear pressure of 25–50 N/100 mm; after lamination, a 24 h dwell at room temperature is used before startup to allow adhesive wet-out on the stainless steel surface. FDA 21 CFR 177.1550 permits the PTFE contact layer as a non-stick functional surface in food machinery provided the adhesive is not in direct food contact and the backing remains continuous; EU 1935/2004 Article 3 applies to overall migration and organoleptic neutrality. The maximum continuous operating temperature at the adhesive interface should not exceed 149°C, while the PTFE surface can tolerate intermittent scrape temperatures up to 260°C. Terminal finished product types include sugar-coated breakfast cereals, laminated dough sheets, soft-cookie lines with sticky glucose syrups, and chocolate enrobing belt transfer plates.
When Hot-Melt Polyolefin Edge Bleed Contacts Compression Platens
Hot-melt polyolefin adhesives used in case and carton sealing are pumped at 150–175°C through slot dies and compression platens; edge bleed from the die lip or nozzle can drip onto machine frames, photoelectric sensors, and platen surfaces, where cooled polyolefin increases friction and shifts the next corrugated blank’s registration. A glass-PTFE release tape with an acrylic PSA can be converted into die lip guards and platen covers; the tape is cut to a width that extends 10 mm beyond the die lip on each side and applied as a single layer with a 100% coverage ratio over the contamination zone. The coating-to-fabric ratio in the backing is controlled to leave no exposed glass fibre at the surface, which prevents wicking of hot-melt into the weave and reduces char formation. During installation on a hot die, the machine is cooled to below 60°C to prevent adhesive flash-off before lamination; roll-down force is 20 N per 25 mm width, and the liner is removed at a low angle of less than 45° to avoid stretching the glass cloth. The adhesive side must not be exposed to polyolefin melt above 120°C continuously because acrylic PSA hardens and loses peel strength; the PTFE side can withstand intermittent contact with molten polyolefin at 175°C. Compliance relevant to the packaging line includes FDA 21 CFR 175.105 for indirect adhesive components where the adhesive is separated from food by a functional barrier, RoHS Directive 2011/65/EU for the electrical cabinet components, and the machine builder’s ISO 12100:2010 risk assessment for adhesive tape as a consumable maintenance material. Terminal finished product types include corrugated case and carton seals, tray erecting lines, and beverage multipack bundling.
PTFE Glass Linings Address Acid Splash in Electrode-Coating Dryers
Electrode coating lines for lithium-ion battery anodes and cathodes use slot-die application of water-based or NMP-based slurries onto aluminium and copper foils, followed by multi-zone floatation dryers at zone temperatures from 60°C to 130°C. Condensate and acidic by-products from solvent recovery and fine carbon black particle carryover accumulate on dryer side walls and on the edges of idler rollers, promoting corrosion and slurry sticking. In these zones, a glass-PTFE acrylic PSA tape is applied to non-circuit steel surfaces and to low-load idler roll ends at a coverage ratio of 100%, with a single backing layer and butt seams to avoid creating a raised edge that can mark wet electrode coating. The adhesive side is laminated to degreased steel at 20–30°C with a 30 N per 25 mm width roller force; the bond is considered permanent after 72 h, because acrylic adhesive builds adhesion to steel and removal may transfer adhesive residue. The PTFE surface shows low absorbance of carbon black and PVDF slurry, but the glass cloth prevents the weave from imprinting into wet electrode film only if the tape is applied without tension; a relaxed laydown with less than 0.5% elongation is specified. Compliance references include ASTM D4969-17 for the backing construction, ASTM D3330/D3330M-04 Method A for peel retention after 7 days at 130°C, REACH Regulation (EC) No 1907/2006, and RoHS Directive 2011/65/EU; published data for SG33-03(R) in this specific solvent mixture is limited. Terminal finished products include lithium-ion battery electrode rolls, supercapacitor electrode webs, and printed electronics substrates.
Competitive Saint-Gobain CHR SG33-03(R) Industrial Glass-PTFE Backing Acrylic 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
Saint-Gobain CHR SG33-03(R) Industrial Glass-PTFE Backing Acrylic Adhesive Pressure Sensitive Tape is a composite pressure-sensitive tape in which a woven glass cloth substrate is finished on the exposed side with polytetrafluoroethylene resin and combined on the reverse side with a pressure-sensitive acrylic adhesive. The SG33-03 portion of the model designation denotes a nominal backing thickness of 0.003 in (0.076 mm); the appended R identifies a release-liner configuration supplied for slit-to-width converting and die-cut part manufacturing. Standard slit rolls are produced from 6.35 mm (0.25 in) to 304.8 mm (12 in) width, with log lengths commonly specified at 33 m (36 yd) for the nominal total thickness of 0.005 in (0.127 mm). The tape is used as a low-friction release surface, electrical insulation layer, high-temperature masking medium, and low-shear protective wrap in industrial converting and original equipment manufacturing.
What limits the continuous service temperature of SG33-03(R) in acrylic-adhesive glass-PTFE configurations?
The PTFE-glass backing tolerates short-dwell contact on sealing jaws operating between 180 °C and 260 °C, but the continuous service rating of the complete tape is governed by the acrylic pressure-sensitive layer. Acrylic adhesives begin to lose shear holding strength at sustained temperatures above 120 °C to 150 °C depending on crosslink density; published data for this specific SG33-03(R) construction is limited, and lot-specific thermal aging should be obtained before committing to bonded joints above 120 °C. In short-dwell rotary sealing operations where the glass-PTFE backing acts as a thermal shunt, intermittent jaw temperatures of 180 °C to 200 °C are typically tolerated for dwell times shorter than 2 s because the adhesive bond line remains below the softening point. The central difference from silicone-adhesive glass-PTFE tapes is therefore the adhesive-limited temperature envelope rather than the backing temperature resistance.
On form-fill-seal machines using polyethylene and polypropylene sealant layers, SG33-03(R) is positioned on the sealing jaw face as a replaceable release surface. The PTFE face prevents molten sealant from wetting the jaw, reduces polymer deposit accumulation, and permits lower release force during the opening stroke. The woven glass scrim resists extension and necking in narrow slits; tensile elongation under ASTM D3759/D3759M is typically below 5 %. The acrylic adhesive is selected for direct lamination to anodized aluminum and stainless steel jaw surfaces because room-temperature peel adhesion to polar metals is higher than that of silicone transfer adhesives. Lamination pressure of 0.07 MPa to 0.14 MPa followed by 24 h room-temperature dwell is used to reach near-maximum peel values, which are measured to ASTM D3330/D3330M and fall in the 2.8 N/10 mm to 4.5 N/10 mm range on stainless steel.
Backing construction and dielectric performance under ASTM test conditions
The release face is a PTFE-impregnated woven glass cloth rather than an unbacked skived PTFE film. The glass scrim provides machine-direction tensile strength in the 35 lb/in to 50 lb/in range when measured to ASTM D3759/D3759M, while the PTFE matrix produces a dynamic coefficient of friction below 0.10 against polished steel under ASTM D1894. Surface resistivity of the PTFE face generally exceeds 10^14 Ω/sq under ASTM D257; however, this value is not a substitute for high-voltage creepage or clearance design. Dielectric breakdown voltage is assessed by the short-time method in oil under ASTM D149. Representative values for the 0.005 in construction usually fall between 4 kV and 7 kV, but the result is influenced by adhesive thickness, liner removal, and conditioning humidity. Where electrical insulation listings are required, users should confirm the specific construction against UL 510 or the applicable IEC 60966 quality assessment; the bare ASTM D149 dielectric proof is an engineering value and does not itself constitute a listing.
Representative property matrix for SG33-03(R) glass-PTFE acrylic adhesive tape
| Property | Test condition or method | Representative value |
|---|
| Backing thickness | Micrometer, dead-weight | 0.003 in (0.076 mm) |
| Total thickness including adhesive | Micrometer, dead-weight | 0.005 in (0.127 mm) |
| Peel adhesion to stainless steel | ASTM D3330/D3330M, 24 h dwell | 2.8–4.5 N/10 mm |
| Tensile strength, machine direction | ASTM D3759/D3759M, 25 mm strip | 35–50 lb/in |
| Elongation at break, machine direction | ASTM D3759/D3759M | <5 % |
| Dielectric breakdown voltage | ASTM D149, short-time, oil | 4–7 kV |
| Dynamic coefficient of friction, PTFE face | ASTM D1894 | <0.10 |
Substrate preparation directly controls deliverable peel adhesion. A dry, oil-free surface is prepared with isopropanol or a 50:50 isopropanol–deionized water mixture before lamination. Application below 10 °C is not recommended because acrylic PSA loses tack; application above 35 °C can produce adhesive transfer and liner track-off during converting. When relative humidity exceeds 60 %, pre-drying is required to prevent entrapped moisture from forming blisters during heat-up. The release liner is intended for kiss-cut die cutting; tooling depth should be controlled between 0.01 mm and 0.03 mm into the liner to avoid fracturing the glass carrier.
When acrylic adhesive is selected over silicone for solvent-sensitive masking and coating lines
Silicone-adhesive glass-PTFE tapes can release low-molecular-weight siloxanes that contaminate liquid coating lines and produce fisheyes in solventborne and waterborne finishes. SG33-03(R) eliminates this contamination route because the pressure-sensitive layer is acrylic. The acrylic system also shows better resistance to plasticizer migration from flexible vinyl than many tackified rubber adhesives, although prolonged contact with dioctyl phthalate is not recommended. In powder coating mask applications, the tape is applied to clean aluminum profiles and may be qualified for cure cycles up to 190 °C for 20 min; removal should be performed while the substrate temperature is below 60 °C to minimize adhesive residue. For wet paint processes, the tape is not recommended for repeated bake cycles above 150 °C unless the process has been validated by pull-off adhesion testing after the final cure.
Comparative operational boundaries for SG33-03(R) and adjacent tape families
| Attribute | SG33-03(R) acrylic glass-PTFE | Silicone-adhesive glass-PTFE | Unbacked PTFE film acrylic tape |
|---|
| Continuous temperature, adhesive limited | ≤120–150 °C | ≤204 °C | ≤120–150 °C |
| Room-temperature peel on steel | 2.8–4.5 N/10 mm | 1.5–2.5 N/10 mm | 1.0–2.0 N/10 mm |
| Silicone transfer risk | None | Present | None |
| Dimensional stability under tension | High | High | Low |
| Minimum application temperature | 10 °C | 5 °C | 10 °C |
| Release face short-dwell service temperature | 260 °C | 260 °C | 260 °C |
Chemical compatibility of the PTFE face follows general PTFE limitations: molten alkali metals, fluorine gas at elevated pressure, and anhydrous ammonia above recommended exposure thresholds are considered incompatible. The acrylic adhesive is softened by prolonged contact with methyl ethyl ketone, toluene, and butyl acetate; incidental solvent splashes should be removed with a dry lint-free wipe and the bond line inspected for edge lift. For electronics packaging, a supplier product declaration should be requested to confirm that the specific lot has been screened for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE under IEC 62321. The product is supplied without intentionally added substances of very high concern; however, final REACH obligations are downstream-user responsibilities and require the latest safety data sheet for the purchased configuration.
