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Sikaflex Construction AP Polyurethane Joint Sealants  :


Sikaflex Construction (AP) 1-part polyurethane sealant for building joints

 

Product Description:

 

Sikaflex Construction (AP) is a one part, moisture curing, elastic joint sealant based on polyurethane. It is suitable for indoor and outdoor applications.

 

Uses:

 

Sikaflex Construction (AP) is used as a general purpose sealant for sealing joints in building construction such as movement and construction/isolation joints around windows and doors, facades, claddings etc. in concrete, brick, wood, metal and PVC sections and structures etc.

 

Characteristics/Advantages:

 

One component, ready to use

Weather resistance, excellent aging resistance

Non Corrosive

Movements capability +/- 25% of average joint width at time of sealing

Very good adhesion to many substrates

Excellent workability

High tear resistance

 

Tests Approval / Standard, ISO 11600(Type F Class 25HM/20LM)

Product Data:

Colours Concrete grey

Packaging   600 ml sausages, 20 sausages per box

 

Storage: Storage Conditions / Shelf Life

 

12 months from date of production if stored in undamaged original sealed containers, in dry conditions and protected from direct sunlight at temperatures between +10 C and +25 C.

 

Technical Data:

Chemical Base

1-part polyurethane, moisture curing

 

Density

1.3 kg/l (colour concrete grey)

 DIN 53479

Skinning Time

4 hours (+23C / 50% r.h.)

 

Curing Rate

3 mm/24 hours (+23C / 50% r.h.)

 

Movement Capability

+/- 25%

 

Joint Dimensions

Min. width = 10 mm / max. width = 35 mm

 

Sag-Flow

0 mm, very good

 DIN EN ISO 7390

Service Temperature

-40C to +70C

 

Mechanical / Physical Properties

Tear Strength

> 6 N/mm (+23C / 50% r.h.)

 DIN 53515

Shore A Hardness

30 after 28 days (+23C / 50% r.h.)

 DIN 53505

E-Modulus

0.5 N/mm2 at 100% elongation (+23C / 50% r.h.)

 DIN EN ISO 8340

Elongation at Break

600% (+23C / 50% r.h.)

 DIN 53504

Elastic Recovery

> 70% (+23C / 50% r.h.)

 DIN EN ISO 7389 B

  

System Information Application Details

 

Consumption / Joint Design

 

The joint width must be designed to suit the movement capability of the sealant. In general the joint width must be > 10 mm and < 35 mm.   A width to depth ratio of 2:1 must be   maintained. All joints must be properly designed and dimensioned by the specifier and the main contractor in accordance with the relevant standards, because changes are not usually feasible after construction. The basis for calculation of the necessary joint width are the technical values of the joint sealant and the adjacent building materials, plus the exposure of the building, its method of construction and its dimensions.

 

Approximate consumption:

 

Joint width

10mm

15mm

20mm

25mm

30mm

Joint depth

8mm

8mm

10mm

12mm

15mm

Joint length/600ml

7.5m

4.5m

2.5m

1.6m

1.3m

 

Backing: Depending on application closed cell, polyethylene foam backing rods or open cell foam backing rod must be used.

 

Substrate Quality:

 

Clean and dry, homogeneous, free from oils and grease, dust and loose or friable particles. Cement laitance must be removed.

 

Substrate Preparation:

 

Clean, sound, dry and free of oil, grease and surface contaminants such as form release agents, curing membranes and hydrophobic water repellents. Any loose particles or laitance should be removed with a rotary mechanical wire brush followed by blowing out with oil free compressed air. Use Sika cementitious or epoxy mortars for making good spalled or damaged joints.

 

Priming:   Refer to Primer Selection Guide for detailed information.

 

Application Conditions/ Limitations:

 

Substrate Temperature: +5C min. / +35C max.

Ambient Temperature: +5C min. / +35C max.

Substrate Moisture Content: Dry

 

Application Instructions

Application Method: Sikaflex Construction (AP) is supplied ready to use.

 

Tools:

 

After suitable joint and substrate preparation, insert Backing Rod to required depth and apply primer if necessary. Insert sausage into sealant gun and firmly extrude Sikaflex Construction (AP) into joint making sure that it is full contact with the side of the joint. Fill the joint, avoiding air entrapment. Sikaflex Construction (AP) must be tooled firmly against joint sides to ensure good adhesion.

Masking tape must be used where sharp exact joint lines or exceptionally neat lines are required. Remove the tape whilst the sealant is still soft. Sleek joint with smoothing liquid for a perfect sealant surface.

 

Cleaning of Tools:

 

Clean all tools and application equipment with Sika Remover-208 /   Sika TopClean-T immediately after   use. Hardened / cured material can only be mechanically removed. 

 

Notes on Application / Limitations:

 

Elastic sealants may not be over painted with rigid or less flexible coatings. Compatibility testing of proposed coatings must be undertaken to ensure suitability. If there is no history of a particular coating/paint being applied over cured Sikaflex- Construction (AP) for a period of six months or more an overpaintability test should be made to determine:

 

1. That the paint dries properly within the expected time frame.

2. That if the paint film dries satisfactorily it is not subsequently softened and/or stained where it comes into contact with the Sikaflex-Construction when exposed to the heat of the sun.

3. That the adhesion of the paint/coating is satisfactory to the Sikaflex-Construction.

 

Colour deviations may occur due to exposure to chemicals, high temperatures, UV- radiation. However a change in colour will not adversely influence the technical performance or the durability of the product.

 

Before using on natural stone contact our Technical Service.

 

Do not use Sikaflex Construction (AP) as a glass sealer, on bituminous substrates, natural rubber, EPDM rubber or on building materials which might bleed oils, plasticizers or solvents which could attack the sealant.

 

Sikaflex-Construction should be used with care resealing joints that were previously filled with silicone sealant. Consult our Technical Department.
 

Do not use Sikaflex Construction (AP) to seal swimming pools.

 

Not suitable for joints with water pressure or permanent water immersion.

 

Only use in well ventilated areas. The freshly applied sealant has a smell similar to 'Amaretto' until it has fully cured (benzaldehyde).

 

Do not mix with or expose uncured Sikaflex Construction (AP) to substances that may react with isocyanates, especially alcohols which are often components within e.g. thinners, solvents, cleaning agents and formwork releasing compounds. Such contact could interfere or prevent the cross linking curing reaction of the material.

 

Epoxy resin coatings should be fully cured prior to the application of the adhesive / sealant as the uncured amine component could inhibit the cure of polyurethane adhesives / sealants.

 

Handling Precautions:

 

Sika sealants are generally harmless provided that certain precautions normally taken when handling chemicals are observed. The uncured materials must not, for instance, be allowed to come into contact with foodstuffs or food utensils, and measures should also be taken to prevent the uncured materials from coming into contact with the skin, since people with particularly sensitive skin may be affected. The use of protecting clothing, goggles, barrier creams and rubber gloves is recommended. The skin should be thoroughly cleansed at the end of each working period either by washing with soap and warm water or by using a resin removing cream - the use of powerful solvents is to be avoided. Disposable paper towels, not cloth towels should be used to dry the skin. Adequate ventilation of the working area is recommended. In case of accidental eye or mouth contact, flush with water. Consult a doctor immediately. 

 

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