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[Shurtape Technologies] A brand name for a clear pressure sensitive tape with a Polypropylene carrier and a methacrylate adhesive that was formerly manufactured by Permacel. J-Lar is a lightweight, glossy, clear tape that is advertised as 'Clear to the core' acrylic packaging tape. Listed uses include overlamination and label protection, light duty packaging, paper repair and mending, and holding applications.

The Shurtape webpage indicates the tape is stronger than Cellophane or acetate and will not yellow with age or discolor packages or objects after being applied.

Synonyms and Related Terms

JLAR; CLR172; Clear to the Core tape;

Alternative: 3M 850


Seal exterior of glass connections

Personal Risk

Shurtape link: JLar Technical and Safety Sheets

Collection Risks

Becomes acidic with age

Physical and Chemical Properties

Backing: Crystal clear, biaxially oriented polypropylene film (BOPP) | Adhesive: Crystal clear, solvent-based acrylic adhesive

Properties & Technical Data
Property Standard Metric
Adhesion to Stainless Steel 30 oz/in width 3.28 N/10 mm
Application Temperature Range 20 F to 110 F -7 C to 43 C
Elongation 140% 140%
Service Temperature Range -20 F to 180 F -29 C to 82 C
Tensile 24 lbs/in width 42.0 N/10 mm
Thickness 2.6 mils 0.066 mm

Handling Properties

Tape should be stored in its original packaging in a cool, dry area away from direct sunlight and should be used within 12 months of date of shipment. Surfaces to which tape is applied should be clean, dry and free of grease, oil or other contaminants.


JLar is a colorless tape available in lengths of 36 yd or 72 yd and widths of 0.5 in, 0.75 in, or 1 in.

Resources and Citations

  • Shurtape webpage (November 2019)
  • Rachael Perkins Arenstein, Lisa Goldberg, and Eugenie Milroy, ‘Support and Rehousing for Collection Storage’ In ‘Preventive Conservation: Collection Storage’ Lisa Elkin and Christopher A. Norris (eds.), Society for the Preservation of Natural History Collections, New York. 2019.
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002