OEX ACX1297R Heat Shrink Dual Wall Red ID: 39mm Length: 300mm - 4 Pce

OEX ACX1297R Dual Wall Adhesive-Lined Heat Shrink Tubing 39mm Internal Diameter Red 300mm Lengths Pack of 4

The OEX ACX1297R is a dual wall heat shrink tube in red, supplied as four 300mm lengths with a 39mm internal diameter before shrinking. Constructed from polyolefin with an inner adhesive lining, it provides both mechanical protection and a waterproof seal when applied. The outer polyolefin layer shrinks to grip the cable or connector while the inner adhesive melts and flows to fill gaps and create a moisture-resistant barrier. The red colour suits positive supply identification in conventional automotive wiring colour coding. Shrink ratio is 3:1, shrink temperature is 110°C, and the operating range is -55°C to +105°C. Covered by a one year warranty.

Product overview

The ACX1297R is the red variant of the OEX ACX1297 dual wall adhesive-lined heat shrink, sharing the same polyolefin construction, shrink ratio, shrink temperature and operating range as the black version. Red is the conventional positive wiring colour in automotive and marine electrical installations, making the ACX1297R the natural choice for positive supply terminations, battery positive cable ends and large positive connector sealing where colour convention assists with circuit identification.

The 3:1 shrink ratio means the 39mm ID before shrink reduces to approximately 13mm, giving a wide working range of cable and connector sizes from a single piece. Each pack contains four 300mm pieces, totalling 1.2m, sized for individual joint and termination applications. The adhesive inner lining melts when heat is applied, flowing around the cable to fill gaps and create a weatherproof seal. The shrink temperature of 110°C allows activation with a standard heat gun at a low setting. The operating range of -55°C to +105°C covers the full range of automotive, marine and outdoor environments.

Features and benefits

Dual wall construction with adhesive inner lining: The polyolefin outer layer shrinks to grip the cable or connector while the inner adhesive melts and flows to fill gaps, creating a mechanical grip and moisture-resistant seal in a single application.

Red colour for positive supply identification: Red is the conventional positive wiring colour in automotive and marine installations, assisting with circuit identification at terminations and joins on positive supply cables.

3:1 shrink ratio: Shrinks to one third of the supplied 39mm internal diameter, down to approximately 13mm, accommodating a wide range of cable and connector sizes from a single piece.

39mm internal diameter before shrink: Suits large cables, connectors and terminal ends, making it practical for battery positive cable terminations, large connector sealing and heavy harness joints.

300mm lengths, pack of 4: Four pieces per pack for individual joint and termination applications, totalling 1.2m per pack.

Shrinks at 110°C: Activates with a heat gun at a low temperature setting, reducing the risk of damage to surrounding wiring and connectors during application.

-55°C to +105°C operating range: Covers cold-climate automotive and marine use through to sustained underbonnet operating temperatures.

Polyolefin with adhesive lining: Industry-standard material combination for weatherproof heat shrink applications in automotive and marine environments.

One year warranty: Covered by a one year OEX warranty.

Technical specs

Frequently asked questions

How does the ACX1297R differ from the ACX1297? Both are 39mm dual wall adhesive-lined heat shrink with identical construction, shrink ratio and operating specifications. The ACX1297 is black and the ACX1297R is red. Select red for positive supply terminations where conventional wiring colour coding is being followed, and black for general or negative side applications.

What is dual wall heat shrink and how does it differ from standard heat shrink? Standard single wall heat shrink provides a mechanical sleeve that grips the cable or connector when heated but does not seal against moisture. Dual wall heat shrink adds an inner adhesive lining that melts during application, flowing around the cable to fill gaps and create a weatherproof seal. The result is both mechanical protection and moisture resistance from a single piece.

What is the shrink ratio and what does it mean for cable sizing? The 3:1 shrink ratio means the tubing shrinks to one third of its original diameter when heated. The ACX1297R has a 39mm internal diameter before shrink, reducing to approximately 13mm after. This covers cables and connectors up to approximately 39mm diameter in a single piece.

What tool do I need to apply this heat shrink? A heat gun set to the appropriate temperature is the recommended tool. Avoid open flames as they can cause uneven shrinking or damage to the tubing. The ACX1297R shrinks at 110°C, achievable with most standard heat guns at a low to medium setting.

Is this product available in other sizes or colours? OEX produces dual wall heat shrink in a range of diameters and colours. Contact us for available sizes and colours to suit your specific application.