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K-FLEX K-996 Contact Adhesive is an air-drying, contact adhesive that is excellent for joining seams and butt joints of elastomeric pipe and sheet insulation.

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K-FLEX K-996 Contact Adhesive is black in color and is available in 1 Liter can.
K-FLEX K-996 Contact Adhesive is recommended for applications with service temperature up to +120°C on applications requiring bonded seams and joints. When the adhesive is applied directly to large flat or curve surfaces, it is suitable for a service temperature range of -30°C to +100°C. The product forms a resilient, flexible, moisture and heat-resistant bond when used with elastomeric products. A low viscosity allows it to be applied easily and ensure maximum effective contact surfaces. It is ideal for bonding porous and non-porous materials, as it will not be absorbed easily, and may be used for bonding elastomeric insulation products to a variety of materials (i.e., other elastomers, metal, concrete, etc.).
For proper adhesion, the surfaces to which the insulation is to be applied must be thoroughly cleaned, dry and unheated. Primed and painted surfaces should be adhensive tested to be sure the insulation will not lift off after application. The adhesive should be thoroughly mixed.
Brush or roll a thin even coat of adhensive on both surfaces to be joined. Allow the adhesive films to become dry to the touch, but tacky, before joining the surfaces. Press the two surfaces together. Be sure the insulation is in the desired position before the adhensive surfaces make initial contact, since the adhensive forms an instant bond, and repositioning after contact is difficult. Moderate pressure should then be applied to the entire bonding area to ensure complete contact. Avoid heat, sparks, and open flames, and use only proper ventilation. Close container after use.
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PHYSICAL PROPERTIES                        K-FLEX® 320 / 620 CONTACT ADHESIVE


Amber (320), Black (620)




Acetone, Toluene, Hexane


Medium Syrup


6.98 ± 0.2 lbs/gal

Shelf Life

12 months in original sealed container. Storage temperature 60°F.

Minimum Dry Time

2 - 4 minutes under normal conditions.

Open Time

Not to exceed 10 minutes.

High Temperature Limits

220°F (104°C) for pipe insulation seams and joints 200°F (93°C) for full bonding sheets

VOC (Volatile Organic Compounds) Content

447 g/L

Flash Point

Less than -4°F


ASTM E84 25/50-rated (10/0 when tested to UL 723)

Freight Classifications

Adhesives NOS. Flammable Liquid 4620 Sub 5, class 60, Un 1133, IMDG class 3.1 PG:11 (packaging group II)

Solid Content

25% ± 2%


200 ft.2/gal (one surface)