Question 1

What is Henkel Polystop CJ4 250mm x 10m x 4mm used for?

Accepted Answer

Henkel Polystop CJ4 is a quick-drying, flexible sealing tape designed to create watertight seals in joints and gaps. It’s suitable for concrete, stone and cement-based materials, and it provides long-lasting elasticity for indoor and outdoor use.

Question 2

What are the key specifications of CJ4?

Accepted Answer

CJ4 measures 250 mm wide, 10 m long, and 4 mm thick. It features a strong adhesive backing, is water-resistant, UV and weather‑resistant, non-toxic, and designed for durable, flexible seals in various environments.

Question 3

What surfaces can CJ4 stick to?

Accepted Answer

CJ4 is designed to seal joints in concrete, stone and cement-based materials and adheres well to a range of common construction substrates. For best results, ensure surfaces are clean, dry and free of dust or grease before applying.

Question 4

Is CJ4 suitable for indoor and outdoor use, and is it weatherproof?

Accepted Answer

Yes. CJ4 is formulated for both indoor and outdoor applications and offers weather resistance, including UV stability, to maintain a reliable seal in varying conditions.

Question 5

How do I apply CJ4 correctly (step-by-step)?

Accepted Answer

Steps: 1) Clean and dry the surface. 2) Cut the tape to the required length. 3) Remove any release liner. 4) Position the tape over the joint and press firmly along the entire length. 5) Use a roller or your finger to ensure full adhesion and seal. 6) Allow the surface to settle; avoid disturbing the tape during initial curing.

Question 6

How quickly does CJ4 set or seal after application?

Accepted Answer

CJ4 is designed to dry quickly and form an immediate seal with firm pressure. For best results, ensure the surface is clean and dry before application and avoid stretching or twisting the tape during placement.

Question 7

Is CJ4 safe to use around homes and in living spaces?

Accepted Answer

CJ4 is described as non-toxic, which supports safer use in homes and offices. As with any adhesive product, use with adequate ventilation, avoid skin contact, and keep out of reach of children and pets.

Question 8

How does CJ4 compare to other Polystop tapes like CJ3, CJ5, and CJ6?

Accepted Answer

CJ4 offers 250 mm width, 10 m length and 4 mm thickness. CJ3 is narrower and thinner (for smaller joints), CJ5 is wider and thicker for larger gaps, and CJ6 provides a longer length. Consider your joint size and required durability when choosing: CJ3 (200 mm x 5 m x 3 mm) — https://fepy.com/product/henkel-polystop-cj3-200mm-5m-3mm; CJ5 (300 mm x 10 m x 5 mm) — https://fepy.com/product/henkel-polystop-cj5-300mm-10m-5mm; CJ6 (250 mm x 15 m x 4 mm) — https://fepy.com/product/henkel-polystop-cj6-250mm-15m-4mm.

Question 9

In what applications would CJ4 be most effective?

Accepted Answer

CJ4 works well for sealing joints in concrete floors and walls, masonry joints, and other cement-based or stonework. It’s also useful for basic insulation and protective barrier tasks in construction, plumbing, automotive, and electrical projects where a flexible, watertight seal is needed.

Question 10

What safety and disposal guidance should I follow with CJ4?

Accepted Answer

Use with proper ventilation and avoid ingestion or skin contact. Wear gloves if handling for extended periods. Dispose of offcuts and packaging in accordance with local regulations; recycle where possible and avoid burning the tape.

Question 11

Is CJ4 a good value, and what return options exist if it doesn’t meet my needs?

Accepted Answer

CJ4 offers durable, long-lasting performance that can reduce reapplication costs over time due to its elasticity and weather resistance. If you need a different specification, consider the CJ3, CJ5, or CJ6 variants, which are available on Fepy with matching product pages for easy comparison and returns are handled per Fepy's standard policy.

Question 12

How can I cut CJ4 to fit corners and irregular shapes?

Accepted Answer

Use sharp scissors or a utility knife to cut the tape to the desired length. For curves or irregular shapes, cut smaller segments and apply gradually, smoothing with a roller or finger to maintain full contact and seal.

فواصل منع التسرب بولي ستوب (CJ4) من هينكل قياس (250mmX10m) سماكة(4mm)

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