3M 253 Silicone Splicing Tape
- Product Name: 3M 253 Silicone Splicing Tape
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- 3M 253 Silicone Splicing Tape is typically used in formulations when electrical insulation and environmental sealing must be controlled within specific ranges.
| HS Code | 250274 |
| Product Name | 3M 253 Silicone Splicing Tape |
| Manufacturer | 3M |
| Product Number | 253 |
| Tape Type | Silicone Splicing Tape |
| Adhesive Type | Silicone |
| Backing Material | Polyester |
| Total Thickness | 3.5 mil (0.089 mm) |
| Color | Translucent |
| Adhesion To Steel | 25 oz/in (2.7 N/10 mm) |
| Tensile Strength | 25 lb/in (438 N/100 mm) |
| Elongation At Break | 100% |
| Temperature Resistance | 300°F (149°C) |
| Core Size | 3 in |
| Roll Length | 36 yd (33 m) |
| Common Roll Widths | 1/2 in, 3/4 in, 1 in, 1.5 in, 2 in |
| Primary Use | Splicing silicone coated papers and films |
As an accredited 3M 253 Silicone Splicing Tape factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 3M 253 Silicone Splicing Tape, supplied as 1-inch by 36-yard rolls, packaged 12 rolls per case. |
| Container Loading (20′ FCL) | 20′ FCL loaded with 3M 253 Silicone Splicing Tape, palletized, shrink-wrapped, evenly distributed, secured, dry, and handled per transport regulations. |
| Shipping | 3M 253 Silicone Splicing Tape is not regulated for transportation. It ships as non-hazardous general freight with no UN number, hazard class, packing group, or marine pollutant. Store in original packaging, keep dry, and avoid direct sunlight or extreme temperatures. Standard handling applies. No special shipping labels required. |
| Storage | Store 3M 253 Silicone Splicing Tape in its original packaging in a cool, dry, well-ventilated area. Maintain temperatures of 15–25°C (59–77°F) and moderate humidity, away from direct sunlight, heat, moisture, dust, and ignition sources. Keep rolls sealed, avoid crushing, and rotate stock using oldest first. Shelf life is typically 24 months under recommended conditions. |
| Shelf Life | Shelf Life: 24 months from date of manufacture when stored at 70°F (21°C) and 50% relative humidity in original packaging. |
In silicone-coated release liner splicing on pressure-sensitive adhesive coating lines, the splice point passes through multi-zone drying ovens, accumulator festoons, and final rewind stations where web tension is maintained between 0.4 N/mm and 1.2 N/mm. The silicone release surface typically presents a critical surface tension below 25 mN/m, which prevents conventional acrylic adhesive tapes from forming stable peel adhesion; splice failure appears as edge lift, adhesive transfer to the coated liner, or telescoping at rewind. 3M 253 is applied as supplied, without solvent, primer, or adhesive additive. The functional addition/placement ratio is set by centring the tape on the butt joint so that 50% of the tape width contacts each web tail. On a 1,500 mm web, a 50 mm splice tape occupies 3.3% of linear web width and avoids a continuous lateral step exceeding the nominal 2.5 mil (0.064 mm) tape caliper. Process conditions include a pneumatic nip applicator with a 60–70 Shore A roller and nip pressure between 0.2 MPa and 0.4 MPa; the applicator dwell time is limited to 0.3–0.8 s per splice cycle to prevent adhesive extrusion. Qualification data should include ASTM D3330/D3330M-04(2018) Test Method A peel adhesion on the actual silicone-coated grade, because lab values on stainless steel do not predict adhesion to cured silicone release surfaces. Regulatory compliance for imported rolls falls under REACH Regulation (EC) No 1907/2006, particularly Article 33 SVHC communication at 0.1% w/w, and RoHS Directive 2011/65/EU Annex II for restricted substances in homogeneous materials. Dimensional certification uses ASTM D3652/D3652M-93(2020) for total thickness; mechanical integrity uses ASTM D3759/D3759M-05(2019) for breaking strength and elongation. Published data for splice performance on release liners with high migratory silicone oil levels is limited; a pre-splice wipe with isopropyl alcohol or heptane is recommended. Terminal products downstream include silicone-coated glassine and polyethylene-coated kraft release liners, double-sided foam tapes, medical adhesive laminates, and window film mounting liners.
| Standard / Regulation | Test or Scope | Application Zone | Qualification Note |
|---|---|---|---|
| ASTM D3330/D3330M-04(2018) | 180° peel adhesion of pressure-sensitive tape | Release liner splicing | Use actual silicone-coated liner, not only stainless steel |
| ASTM D3759/D3759M-05(2019) | Breaking strength and elongation | Splice mechanical integrity | Compare tape tensile response to web tension spikes |
| ASTM D3654/D3654M-06(2019) | Shear adhesion of pressure-sensitive tape | Powder coating masking and hot splicing | Test at 150°C or 180°C depending on oven residence |
| RoHS Directive 2011/65/EU | Annex II restricted substances | All zones | Supplier declaration for homogeneous materials |
| REACH Regulation (EC) No 1907/2006 | SVHC communication | All zones | Maintain Article 33 declaration for EU import |
Does Silicone-Adhesive Splicing Tape Survive Rotary Die-Cutting and Waste Matrix Stripping on Silicone-Coated PET Liners?
Because a spliced silicone-coated polyester liner passes through rotary die-cutting, waste matrix stripping, and sheet delivery at speeds of 80–200 m/min, the splice creates a local caliper step of 0.064 mm that can disturb kiss-cutting stability if the die-cutting anvil gap is set below 0.15 mm. The tape-to-web placement ratio here is calculated by converting width: a 19 mm splice on a 330 mm liner represents 5.8% of web width, while the butt joint itself has 0% substrate overlap. The splice must remain on the liner side only, never contacting the die-cut label face, because silicone adhesive transfer to label adhesive would alter peel values measured under FINAT FTM 1 or ASTM D3330/D3330M-04(2018). Production equipment includes magnetic cylinder rotary die stations, anvil rolls with a hardness range of 80–90 Shore A, and vacuum waste strippers operating at −0.02 MPa to −0.06 MPa. Regulatory compliance for export shipments relies on RoHS Directive 2011/65/EU Annex II and REACH Regulation EC 1907/2006; for North American converters, ASTM D3759/D3759M-05(2019) tensile testing is used to confirm the splice survives high-speed starts and stops. Terminal products include die-cut pressure-sensitive labels, multi-layer coupon labels, and RFID label inlays with silicone-coated PET liner.
Powder Coating Masking: Oven Residence, Silicone Adhesive Residue, and Surface Energy Effects
Masking of threaded bores, seal faces, and gasket flanges before powder coating uses 3M 253 as a single-layer protective tape that follows as-supplied dimensions; no adhesive dilution or primer is used. The placement ratio for a machined face is defined by the tape width overlap onto the adjacent uncoated zone. A 25 mm tape applied with a 6 mm edge overlap uses 24% of its width to seal against powder ingress while the remaining 76% covers the substrate. Pretreatment typically includes alkaline degreasing, zirconium or phosphate conversion coating, and a 100–150°C dry-off stage; the tape is applied after dry-off and before electrostatic spray to minimize chemical attack. In the cure oven, polyester-based powder chemistries are crosslinked at 180–200°C for 10–20 min; the tape is rated for continuous service at 204°C. The limiting process risk is not adhesive melting but post-cure residue caused by exceeding the continuous-use temperature during infrared boost zones or by removing tape while the part is above 60°C. Powder coating lines should validate tape performance using ASTM D3654/D3654M-06(2019) shear adhesion at 180°C and assess residue under ISO 9227:2022 salt spray after coating. Architectural applicators may additionally submit coated parts to AAMA 2604-13 performance criteria for aluminum extrusions. Downstream terminal parts include architectural aluminum profiles, cast aluminum pump housings, agricultural equipment brackets, and steel furniture frames.
On continuous heat-sealing and release-belt lines that use silicone-coated fiberglass fabric as the carrier, edge tears and splice failures are driven by cyclic belt tension around small-diameter pulleys. 3M 253 is applied as a two-side butt splice on the fabric ends; the placement ratio is 50% of the tape width on each side of the joint, with a 25 mm tape across a 200 mm belt producing 12.5% width coverage. The application process requires degreasing the silicone-coated fabric surface with isopropyl alcohol or heptane and allowing 30–60 s for solvent evaporation before tape placement at room temperature. The spliced belt then passes around rollers with a minimum diameter of 40 mm under a tension of 0.5–1.5 N/mm; repeated heating cycles at 150–180°C should be validated with ASTM D3654/D3654M-06(2019) shear creep testing because the silicone adhesive will crosslink further at elevated temperature. Compliance for industrial non-food-contact belt applications is limited to general REACH EC 1907/2006 and RoHS Directive 2011/65/EU obligations; direct food-contact status is not claimed, and published data for this specific configuration is limited. Downstream terminal products include silicone-coated fiberglass heat-sealing belts, release belts for laminating machines, and non-stick conveyor belts in drying tunnels.
When 3M 253 Is Used as a Release Paper Splice in Hot-Melt Prepreg Manufacture
Hot-melt prepreg lines coat epoxy or bismaleimide resin films onto silicone-coated release paper at web temperatures from 60°C to 120°C. The splice tape enters the coating nip and may dwell in the accumulator for 2–15 min depending on line speed and festoon length. The placement ratio for a 75 mm wide splice on a 1,500 mm release paper is 5% of web width, with 50% of the tape width gripping each paper tail. The tape must not transfer silicone adhesive to the coated resin film; validation uses ASTM D3330/D3330M-04(2018) peel adhesion on the exact release paper and a contact contamination test under ASTM D3654/D3654M-06(2019) at 100°C. Compliance is governed by REACH EC 1907/2006 for European prepreg export and by material declarations aligned with RoHS Directive 2011/65/EU. The downstream process includes film coating, cooling, and winding into prepreg rolls; terminal products include unidirectional carbon/epoxy prepreg, glass/epoxy prepreg, and bismaleimide tooling prepreg. The operational boundary is that silicone adhesive contamination of prepreg resin systems cannot be fully excluded by generic data; trial runs with the specific resin matrix are required.
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- 3M 253 Silicone Splicing 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.
The 3M 253 Silicone Splicing Tape is a self-fusing, unsupported silicone elastomer product supplied on a release liner. It is specified for splicing and insulating silicone-rubber-insulated wire and cable where continuous operating temperature reaches 180 °C (356 °F) and short-term excursions reach 260 °C (500 °F). The material contains no pressure-sensitive adhesive; after liner removal, clean silicone surfaces inter-diffuse under mechanical wrapping tension to form a homogeneous silicone wall. Nominal roll geometry is 1 in × 36 yd (25.4 mm × 32.9 m).
Because the splicing mechanism is self-fusion rather than adhesive bonding, the product is selected for class H thermal environments where organic adhesive tapes can fail by embrittlement and carbonization. The tape imposes stricter process controls: surface contamination and insufficient elongation prevent fusion and leave an interface that may fail under partial discharge testing.
Typical application environments include silicone-rubber-insulated leads on industrial ovens, resistance heating equipment, stator leads for class H motors, furnace wiring, and high-temperature cable harnesses. The product is commonly applied as a rebuild layer over damaged silicone jackets and as an outer splice insulation layer beneath varnish treatment or braided sleeving.
Product Identity and Declared Electrical Values
The manufacturer-published typical values in Table 1 are material references. They do not by themselves define the voltage rating of a completed splice; the rating depends on wrap geometry, overlap ratio, cure time, surface preparation, and the presence of interfacial defects.
| Property | Published Typical Value | Test Method |
|---|---|---|
| Total tape thickness | 0.020 in (0.51 mm) | ASTM D1000 |
| Tensile strength at break | 20 lb/in (3.5 N/mm) | ASTM D1000 / ASTM D412 |
| Elongation at break | 450% | ASTM D412 |
| Dielectric strength | 400 V/mil (15.7 kV/mm) | ASTM D149 |
| Continuous operating temperature | 180 °C (356 °F) | manufacturer data |
| Short-term peak temperature | 260 °C (500 °F) | manufacturer data |
Tensile and elongation values are obtained on an unwrapped film. The winding process reduces effective thickness; at 100% elongation, the cross-sectional area is reduced and the as-applied layer thickness falls below the nominal 0.020 in (0.51 mm). Batch-to-batch differences in elongation of ±10% are typical and require confirmation on each production lot. Dielectric strength measured per ASTM D149 is a material property, not a system withstand value; in a taped splice the interface and overlap edges remain the limiting dielectric path.
What Governs the Self-Fusing Cure and Winding Conditions?
Self-fusion in the silicone matrix is a contact-mediated interdiffusion of polydimethylsiloxane chains, not an adhesive wetting process. The mating surfaces must be free of mold-release residues, silicone processing oils, dust, and condensed moisture. On motor rewind lines, wiping the lead jacket with 99% isopropyl alcohol or a heptane-based cleaner followed by 10 min at 60 °C dry-air exposure is standard before wrapping. Residual release agent frequently leaves a visible boundary line after 24 h at 23 °C; the defect may pass visual inspection but fail partial discharge testing under phase-to-ground voltage.
The tape is applied under 50% to 100% elongation with 50% overlap. At 50% elongation, a single layer of nominal 0.020 in (0.51 mm) tape is reduced to approximately 0.013 in (0.33 mm). A half-lapped wrap deposits two layers at each point, yielding approximately 0.027 in (0.69 mm) of as-wrapped material before cure; two half-lapped wraps yield approximately 0.053 in (1.35 mm). Handling strength typically develops in 4 h at 23 °C and 50% RH; full cure requires approximately 72 h. A post-wrap cure of 4 h at 80 °C is used on production lines to shorten the interval before varnish impregnation or overjacketing.
Controlled winding equipment can hold elongation within ±5%. Hand wrapping produces wider tension variation. If the outer layer is not held under sustained contact pressure, interdiffusion is incomplete and the splice remains a mechanically weak laminate. This failure mode is observed on vertical bus-bar and overhead joint work, where gravity and limited access reduce wrap tension.
When the spliced assembly enters a vacuum-pressure impregnation cycle, unfinished fusion at the overlap edge can become a source of void channels. Low-viscosity varnish migrates into the void during the vacuum phase and cures as a rigid interlayer, reducing the conformability of the silicone wall. Preheating the completed wrap for 30 min at 60 °C before immersion reduces this defect; published data for this specific configuration is limited.
At 4.16 kV class machines, the tape is used as an outer build layer over primary groundwall insulation, not as a replacement for mica-based groundwall. The wrap is extended at least 25 mm (1 in) beyond the damaged region on each side. The final edge is feathered with half-width strips to reduce field enhancement. The completed splice is then verified by insulation resistance and polarization index under IEEE 43.
When Silicone Splicing Tape Replaces Glass-Cloth or Polyimide Tape
Glass-cloth adhesive tapes and polyimide adhesive tapes provide high-temperature dielectric isolation through an adhesive layer. That adhesive limits the continuous thermal class and can form a carbonized track under partial discharge. The 253 tape eliminates the adhesive layer, but requires surface cleanliness and elongation control that adhesive tapes do not. Table 2 compares general product families.
| Product Family | Bonding Mechanism | Continuous Thermal Class | Nominal Thickness | Dielectric Strength |
|---|---|---|---|---|
| 3M 253 silicone splicing tape | self-fusing silicone interdiffusion | 180 °C (356 °F) | 0.020 in (0.51 mm) | 400 V/mil |
| 3M 70-type self-fusing silicone tape | self-fusing silicone interdiffusion | 180 °C (356 °F) | 0.012 in (0.30 mm) | 400 V/mil |
| Glass-cloth electrical tape | thermosetting adhesive | 155 °C typical | 0.007–0.010 in | 250–400 V/mil |
| Polyimide tape | pressure-sensitive adhesive | 180 °C | 0.002–0.003 in | 400–600 V/mil |
The 3M 70-type tape shares the same silicone chemistry but is supplied at 0.012 in (0.30 mm) nominal thickness. For a given splice build, the 253 tape requires fewer passes. On a silicone lead jacket with 0.045 in (1.14 mm) wall thickness, two half-lapped wraps of 253 tape at 50% elongation provide an as-wrapped wall near 0.053 in (1.35 mm), while the thinner tape requires additional passes to reach the same build.
Ethylene propylene rubber splicing tapes are self-amalgamating but normally carry a continuous rating near 130 °C. They offer higher resistance to nonpolar oils than silicone and are therefore preferred when thermal demand is lower and oil exposure is present. Butyl mastics seal moisture effectively but may flow under class H temperatures; they do not provide the same thermal stability. Glass-cloth tape remains specified where abrasion resistance is dominant and where hand-wrapped adhesive application is the only practical method.
Silicone elastomers swell in nonpolar hydrocarbon oils, aromatic solvents, and some ester-based fluids. Continuous immersion in transformer oil or fuel contact can reduce wrap tension and increase permeability. An oil-resistant overjacket or fluoropolymer overwrap is used in such environments. The tape is not intended for direct contact with strong acids, strong bases, or pressurized steam.
Electrical testing of the installed splice follows the relevant machine or cable specification. The tape material is tested for dielectric strength under ASTM D149; tensile and elongation properties are reported under ASTM D1000 or ASTM D412. Compliance status with RoHS Directive 2011/65/EU and REACH Regulation EC 1907/2006 must be verified using the current manufacturer certification. Storage should be in sealed polyethylene at 21 °C ± 3 °C and 40–60% RH; exposure to ultraviolet radiation, ozone, or surface contamination retards fusion. A shelf life of 5 years from date of manufacture is typical when the original packaging is intact, but fusion should be confirmed on a sacrificial sample after extended storage.
