For dry-running slide surfaces and release-critical packaging stations, the pressure-sensitive tape designated Saint-Gobain CHR RU101 combines a skived Rulon filled-fluoropolymer film backing with an acrylic pressure-sensitive adhesive. The construction is intended for roll converting into die-cut pads, roll coverings, and guide-rail strips where unfilled PTFE tape may show excessive cold flow or abrasive wear. Distribution-grade technical summaries for the standard configuration commonly cite a backing thickness of 0.127 mm and an adhesive thickness of 0.051 mm, yielding a nominal total thickness of 0.178 mm before liner removal. Lot-specific certificates should be requested because backing tensile values, liner caliper, and adhesive coat weight can vary with skiving conditions and coating speeds. The acrylic adhesive transfers the sliding and release demands to the selected substrate, while the Rulon film provides a low-friction surface that is filled to resist creep. The product is not a direct substitute for all PTFE tapes because filler addition changes dielectric, friction, and cutting behavior.

How does a filled-fluoropolymer backing alter wear and creep compared with unfilled skived PTFE?

Rulon film is not a pure PTFE homopolymer; it contains particulate fillers that interrupt the slip-plane continuity of the fluoropolymer matrix and increase compressive load capacity. Unfilled skived PTFE can exhibit a static coefficient of friction as low as 0.04–0.10 when measured under ASTM D1894, but it also tends to cold-flow under moderate static load, thinning out at bearing pads and fastener holes. Filled fluoropolymer surfaces used in Rulon film typically show a moderate increase in friction, often in the 0.10–0.20 range under clean steel-sled conditions, while providing better wear resistance and reduced deformation under load. The selection trade-off is therefore not solely lowest friction; it is service life in sliding or oscillating contact. Public documentation for the exact filler system in CHR RU101 does not always identify filler type, particle size, or loading, so wear-rate comparisons should be confirmed by ASTM D3702 thrust-washer testing or a block-on-ring procedure using the actual counterface. Because the backing is a skived film rather than a coated woven fabric, edge fibrillation and weave-derived surface roughness are reduced, but the film has lower tear resistance than glass-reinforced products.

On rotary band sealers and jaw-type heat-sealing stations, CHR RU101 is applied to stainless steel sealing jaws to prevent molten polyethylene or multilayer sealant films from bonding to heated metal. Typical operating conditions for this service are 120–200°C jaw surface temperature, 0.5–2.0 s dwell time, and 0.1–0.4 MPa jaw pressure depending on film gauge and sealant layer. The Rulon backing resists peel-away from the jaw surface as the sealed film releases, but the dominant failure mode is frequently charred adhesive residue at the cut edges where the adhesive is exposed to repeated heat. Limiting continuous adhesive-line exposure to 150°C and placing the tape edge outside the direct heat zone extend the service interval. When the seal cycle exceeds 180°C, a silicone-adhesive product may be considered only after silicone transfer risk to the package surface has been assessed.

Adhesion to metal substrates and liner removal in converting operations

Peel adhesion of acrylic pressure-sensitive tape is time-dependent; values collected under ASTM D3330/D3330M after a 20 min dwell on stainless steel will usually be lower than values collected after 24 h because the adhesive continues to wet the metal surface. Surface preparation with 2-propanol or a heptane/isopropanol blend is typical, provided the solvent is fully evaporated and the substrate is at room temperature. Polypropylene, acetal, and other low-surface-energy substrates may require corona or plasma treatment; untreated polypropylene can reduce peel values by more than 50% compared with stainless steel under the same ASTM D3330/D3330M condition. Release-liner removal on high-speed converting lines should account for electrostatic charge accumulation on the thin Rulon film. If the liner is stripped at speeds above 30 m/min in a dry room below 30% RH, ionizing bars are commonly installed to prevent dust attraction and die-cut mis-register.

In chute liners, guide rails, and packaging machine contact edges, the product is applied in strips along high-friction or product-build-up zones. The low-energy Rulon surface reduces adherence of sticky confectionery masses, hot-melt adhesives, and polymer pellets, but the tape is not a structural repair for metal surfaces that are deeply pitted or dimensionally distorted. Adhesive wetting on stainless steel with a surface profile of 0.8–1.2 µm Ra is generally adequate after solvent wiping, whereas deep pits retain air pockets that can nucleate premature delamination. Strips should be oriented so that exposed edges face away from the direction of product flow to reduce peel initiation under particulate abrasion.

Electrical insulation uses may be considered where a thin low-friction barrier is required around bus bars, coil windings, or sliding sensor carriers. Dielectric strength is thickness-dependent and should be tested according to ASTM D149 on the finished part rather than on raw tape. Filled fluoropolymers typically exhibit lower dielectric strength than unfilled PTFE because particulate fillers introduce local field enhancement. Published data for this specific configuration is limited; CHR RU101 is therefore not substituted for polyimide electrical tape without verification of the required insulation voltage and thermal class.

When silicone contamination is not an acceptable process variable

Silicone pressure-sensitive adhesives can provide higher continuous thermal limits, but they may release low-molecular-weight siloxanes that migrate to adjacent painted, printed, or coated surfaces. In packaging lines that later receive printing, lamination, or powder coating, silicone transfer can create craters or interlayer adhesion loss. An acrylic adhesive tape such as CHR RU101 avoids intentional silicone at the adhesive interface. The trade-off is thermal: acrylic PSAs generally retain shear holding at 120–150°C for continuous use, whereas silicone PSAs are commonly rated for 200–260°C short excursions. Where the tape is used near paint bake cycles above 150°C, adjacent painted panels should be evaluated by ASTM D3359 cross-cut adhesion to confirm that no transfer of adhesive or backing constituents has occurred. Acrylic adhesives also resist UV-induced yellowing better than natural rubber adhesives, which reduces visible degradation in film-wrap stations with sustained high-intensity lighting.

Comparative tape-class selection depends on wear, contamination, and thermal limits

The table below distinguishes CHR RU101 from the most common alternatives on low-friction roll and guide applications. Selection is controlled by whether the process can tolerate silicone, whether conformability or tensile strength is dominant, and whether the operating temperature is limited by the adhesive or the backing.

Compared with a PTFE-coated glass cloth tape, CHR RU101 has a homogeneous film backing and therefore no glass-fiber weave to generate exposed fiber ends at the cut edge. However, it will not provide the same tensile strength in applications where the tape is pulled over a roller gap or installed under high web tension. Width-normalized tensile values should be compared using ASTM D3759/D3759M. Compared with an unfilled skived PTFE tape, the filled Rulon film offers greater wear life on abrasive product contact surfaces and better dimensional stability under compression, but it may have a slightly higher coefficient of friction under ASTM D1894 and lower electrical insulation. Compared with a UHMW tape, CHR RU101 withstands higher intermittent temperatures and gives a lower coefficient of friction, but it is generally harder and requires sharper die-cutting blades.

Lot verification is based on the following test matrix

Incoming material specifications should be controlled against the test methods listed in the table. The acceptance limits are established from production trials and supplier certificates because no universal value applies to every substrate, surface roughness, and converting line.

The operational boundary of CHR RU101 is not fixed by the Rulon backing, which can tolerate short exposure above 260°C, but by the acrylic adhesive and by adhesive-substrate compatibility. Trials should be conducted on plasticized PVC, flexible polyurethane, or heavily filled polyolefins because plasticizer migration can soften the adhesive and reduce shear holding. ASTM D3654/D3654M shear adhesion at 60°C with a 500 g load for 24 h is commonly used to screen this failure mode. Avoid amine-cured epoxy primers in the bonding area before adhesive application because uncured amine can migrate to the adhesive interface and cause debonding; epoxy-coated surfaces should be fully cured and solvent-wiped. The product is intended for solid-film contact rather than continuous liquid immersion; the acrylic adhesive resists intermittent splash but not prolonged immersion in ketones or chlorinated solvents.

Die-cutting is generally performed by kiss-cutting through the backing and adhesive while leaving the liner intact. Flatbed or rotary die-cutting with a 60–70 Shore A cutting anvil and controlled impression pressure is used because excessive pressure cracks the filled fluoropolymer backing at the cut edge. Butt-cutting on a log saw is preferred over crush cutting for wide rolls because the harder filled film can produce edge burrs under crush-cutting knives. If roll stock is conditioned at 20–25°C and 40–60% RH before converting, dimensional shifts and electrostatic discharge are reduced.

Chemical resistance is governed by the Rulon surface; the adhesive side is less resistant to aggressive solvents. The tape is compatible with aliphatic hydrocarbons, dilute acids, and alkalis at room temperature under intermittent contact, but continuous exposure to strong oxidizing acids, ketones, or ester-based cleaning solvents can degrade adhesion. ASTM D896 is used to test adhesive resistance to chemical reagents if the production environment includes sanitizing washdowns or solvent wipe cycles.

Direct food-contact status must be confirmed with the manufacturer because the acrylic adhesive and release liner may not be covered by the same regulatory clearances as the Rulon backing. Any statement of compliance should specify 21 CFR 175.105 or 21 CFR 177.1550 as applicable, and the use condition must match the cited temperature and food-type limitations. Shelf life of acrylic PSA tapes is generally 12–24 months from date of manufacture when stored at 21°C and 50% RH in original packaging; the supplier certificate for CHR RU101 should be used to set the disposition date.