256M
256M is a double-coated acrylic tape with 2 mils of Acrylic (I630) adhesive on each side of a 0.5 mil PET film carrier, supplied on a 5.5 mil 74# poly-coated kraft liner for a 10 mil total thickness. The high-tack, moderate-shear adhesive system delivers 70 oz/in adhesion to steel at 24-hour dwell (both sides) and shear hold exceeding 7 days, with explicitly rated Excellent plasticizer and oil resistance.
Key Properties
- Adhesion to Steel, 24 HR Dwell (both sides, 1 MIL PET): 70 oz/in (PSTC-101 — Modified)
- Adhesion to Steel, Initial (both sides, 4 MIL Aluminum Foil): 75 oz/in (PSTC-101 — Modified)
- Shear Adhesion: >7 days (PSTC-107 — Modified)
- Adhesive Thickness: 2 mils per side (PSTC-133)
- Carrier: 0.5 mil PET Film
- Total Thickness: 10 mils (PSTC-133)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Adhesive Thickness, Exposed Side | 2 mils | PSTC-133 |
| Adhesive Thickness, Liner Side | 2 mils | PSTC-133 |
| Carrier Thickness | 0.5 mils | PSTC-133 |
| Liner Thickness | 5.5 mils | PSTC-133 |
| Total Thickness | 10 mils | PSTC-133 |
| Adhesive Type, Covered Side | Acrylic (I630) | — |
| Adhesive Type, Exposed Side | Acrylic (I630) | — |
| Adhesive System | Permanent Adhesive | — |
| Adhesive Side | Double Sided Adhesive | — |
| Adhesive Backing / Carrier | PET Film | — |
| Color | Clear | — |
| Liner | 74# poly-coated kraft | — |
Adhesion Properties
| Property | Value | Test Method |
| Adhesion to Steel, Exposed Side, 24 HR Dwell (1 MIL PET) | 70 oz/in | PSTC-101 — Modified |
| Adhesion to Steel, Exposed Side, Initial (1 MIL PET) | 56 oz/in | PSTC-101 — Modified |
| Adhesion to Steel, Exposed Side, Initial (4 MIL Aluminum Foil) | 75 oz/in | PSTC-101 — Modified |
| Adhesion to Steel, Liner Side, 24 HR Dwell (1 MIL PET) | 70 oz/in | PSTC-101 — Modified |
| Adhesion to Steel, Liner Side, Initial (1 MIL PET) | 56 oz/in | PSTC-101 — Modified |
| Adhesion to Steel, Liner Side, Initial (4 MIL Aluminum Foil) | 75 oz/in | PSTC-101 — Modified |
| Shear Adhesion | >7 days | PSTC-107 — Modified |
Environmental Performance
| Property | Value | Test Method |
| Plasticizer Resistance | Excellent | — |
| Resistance to Oils | Excellent | — |
- Mounting of displays, signs, posters, mirrors, and nameplates with higher bond strength than entry-level grades
- Bonding of cloth, vinyl, cork, paper, and decorative wall products to varied substrates
- Paper splicing in web converting, printing, and packaging applications
- Lamination of rigid and flexible plastics in environments requiring oil, plasticizer, and UV resistance
- General-purpose double-sided bonding where greater adhesive wet-out is required on textured or irregular surfaces
Common industries: Graphic arts, display and signage, printing and paper converting, commercial interiors, industrial manufacturing.
256M is a general-purpose supported double-coated acrylic tape constructed with 2 mils of Acrylic (I630) adhesive on each face of a 0.5 mil PET film carrier, yielding a 4.5 mil adhesive-plus-carrier profile and a 10 mil total stack with the 5.5 mil 74# poly-coated kraft liner. Compared to the lighter 254M grade, 256M carries 54% more adhesive mass per side, which translates to improved bond strength — 70 oz/in to steel at 24-hour dwell versus 60 oz/in for 254M — and greater wet-out capability on irregular or textured surfaces.
The adhesive is a high-tack, moderate-shear formulation with symmetric performance from either face, suited for bonding and laminating a broad range of substrates including cloth, vinyl, cork, paper, and rigid or flexible plastics. Resistance to oils, plasticizers, and UV light is rated Excellent — an explicit performance claim that supports durable service in aggressive environments. Shear adhesion exceeds 7 days under PSTC-107 conditions.
The carrier and liner are both conformable, supporting application to contoured surfaces while providing dimensional support during converting and die-cutting. Typical applications include mounting displays, signs, posters, mirrors, nameplates, decorative wall products, paper splicing, and applications requiring UV and extreme temperature resistance.
What differentiates 256M from 254M?
256M carries 2 mils of adhesive per side (10 mil total stack), compared to 1.3 mils per side (8.6 mil total) for 254M. The heavier adhesive mass raises peel adhesion to steel from 60 oz/in to 70 oz/in at 24-hour dwell and improves wet-out on textured surfaces. 256M also explicitly lists Excellent ratings for plasticizer and oil resistance, which are referenced in the 254M narrative but not rated on the technical data table.
Why is peel adhesion important when selecting this tape?
Peel adhesion is the primary bond strength indicator for double-coated general-purpose tapes. For 256M, the TDS reports both initial and 24-hour dwell values on both faces, confirming symmetric performance (70 oz/in at 24-hour dwell from either side) and demonstrating typical PSA bond build behavior (56 oz/in initial building to 70 oz/in after 24 hours).
What is the operating temperature range for 256M?
The TDS describes the product as having excellent extreme temperature performance but does not publish specific continuous or maximum service temperature values. Contact H-O Products for guidance on specific thermal service conditions.
Is 256M suitable for oil-exposed or plasticizer-containing environments?
Yes. The TDS explicitly rates plasticizer resistance and resistance to oils as Excellent, and describes the adhesive as resistant to UV light. No specific regulatory compliance standards are listed on the TDS for this material.
How should 256M be specified?
Specify grade (256M), adhesive thickness per side (2 mils), carrier (PET), liner (74# poly-coated kraft), compliance requirements, dimensional tolerances, and finished format.
