Silicone Primer Wacker AV (SLM 74300)

  • Silicone Primer Wacker AV (SLM 74300)

Not in stock, please contact us.

  • Article code: A10892 + A10891

✔ low solvent content
✔ straightforward processing
✔ 2 component mixing ratio 2:1
✔ excellent adhesion
✔ no drying necessary

€ 160,-
€ 132,23 Excl. tax

Add to wishlist

Buy now Pay in 14 days with Klarna

  • Fast shipping! Everything available from stock
  • Buy from the specialist
  • Extended internal Laboratory
  • More than half a million satisfied customers


Product description

Silicone Primer Wacker AV (SLM 74300)

The mixture forms a rigid film of silicone resin when exposed to humidity at ambient or elevated temperature and adheres firmly to the substrate. The catalyzed silicone rubber applied to it then forms a tight bond with this resin film during vulcanization. This primer is suitable for all addition silicones (Silicone addition...) variants from our web shop.  

Most silicones often do not chemically bond to a surface. Therefore, to promote adhesion, a primer must be used.

Even silicone formulations modified with large amounts of silicone liquid, of the kind commonly used for making pressure pads, develop excellent adhesion to aluminum or plywood carrier plates when SLM 74300 (Primer AV) is used.

This primer works on:

Metals (such as aluminum, lead, iron, steel)
Some plastics (such as PETG, Nylon, acrylic, epoxy, PVC)
Other substrates

CAUTION: The primer has an ignition temperature of 3°C (from 3°C flammable gases are produced). You must therefore be very careful!


To obtain a ready-to-use mixture, mix components A and B in the ratio 2 : 1.

Due to the low viscosity of the components, this can be achieved by simply shaking the closed mixing vessel.

The final mixture has a pot life of about 2 hours. After that time, we cannot guarantee good adhesion.

Therefore, it is important to mix only the amount that can be processed in that time frame. With 1 g of ready-to-use mixture, an area of approx.
100 cm2 of plywood or 500 cm2 of aluminum can be primed.

The mixture of A and B may release small amounts of hydrogen gas. Therefore, never close the mixing container tightly.

Preparation of the substrate
The surfaces to be primed must be dry and free of grease, oil or other contaminants.
The surface should first be cleaned with a non-polar solvent such as mineral spirits (at a boiling range of 80 °C to 140 °C), followed by a polar solvent, preferably acetone.
Loose particles should be removed and very smooth surfaces roughened by grinding.

Application of primer.
The primer is best applied with a brush, although dipping or spraying is also possible. On relatively smooth, non-absorbent surfaces such as aluminum, the primer should be applied as thinly as possible and without air bubbles. On very rough or absorbent surfaces, such as plywood, the coating should be applied quite generously.

Applying the rubber
An advantage over ordinary primers is that the catalyzed silicone rubber can be applied immediately after the primer has been applied. No drying or heating is required.
The catalyzed silicone rubber must be applied to the primer layer no later than after 7 hours, otherwise a decrease in adhesion may occur.
Usually after 6 hours sufficient adhesion has developed to allow the pads to be removed without problems.

Shelf life

Components A and B of SLM 74300 are best stored between 5 °C and 30 °C in the tightly closed original packaging. The "best before" date of each batch is shown on the product label.
Storage after the date indicated on the label does not necessarily mean that the product is no longer usable. In this case, however, the properties required for the intended use should be checked for quality assurance reasons.

Safety information

Component B of SLM 74300 may develop hydrogen gas or hydrogen-containing oligomers in the presence of certain substances. Please observe the safety data sheet.
The mixture of A and B may also release hydrogen gas. Therefore, do not seal the mixing vessel properly.


H-CodeHazard Statements

H225 Highly flammable liquid and vapour.

H304 May be fatal if swallowed and enters airways.

H315 Causes skin irritation.

H318 Causes serious eye damage.

H336 May cause drowsiness or dizziness.

H361d Suspected of damaging the unborn child.

H373 May cause damage to organs through prolonged or repeated exposure.

H411 Toxic to aquatic life with long lasting effects.

P-Code Precautionary Statements

P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.

P233 Keep container tightly closed.

P271 Use only outdoors or in a well-ventilated area.

P280 Wear protective gloves/protective clothing/eye protection.

P273 Avoid release to the environment.

P243 Take action to prevent static discharges.

P301 + P310 IF SWALLOWED: Immediately call a POISON CENTER/ doctor.

P331 Do NOT induce vomiting.

P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

P310 Immediately call a POISON CENTER/ doctor.

P304 + P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.

P312 Call a POISON CENTER/ doctor if you feel unwell.

P302 + P352 IF ON SKIN: Wash with plenty of soap and water.

P332 + P313 If skin irritation occurs: Get medical advice/ attention.

P391 Collect spillage.

P370 + P378 In case of fire: Use extinguishing powder, alcohol-resistant foam or carbon dioxide to extinguish.

P403 + P235 Store in a well-ventilated place. Keep cool.

P501 Dispose of contents/container to waste disposal

Product information

EN - Product Information Wacker Silicone Primer AV (SLM 74300).pdf

Wacker Primer AV

EN - Safety Data sheet Wacker Primer AV B.pdf

EN - Safety Data sheet Wacker Primer AV A.pdf



Specifications for: Silicone Primer Wacker AV (SLM 74300)

  • Suitable for condensation curing silicone +
  • Suitable for addition curing silicone ++
  • Suitable for Peroxide curing silicone NA
  • Adhesion to silicone surface +/-
  • Adhesion to metal +
  • View all specifications
  • Adhesion to wood ++
  • Adhesion to various plastics NA
  • Adhesion to acrylate NA
  • Adhesion to (anodised) aluminium ++
  • Adhesion to polyamide NA
  • Adhesion to Polyester NA
  • Adhesion to polyurethane NA
  • Adhesion to glass NA
  • Adhesion to ceramics NA
  • Number of components 2
  • Flashpoint 2 oC
  • Viscosity, kinematic, mm²/s 33
  • Density @20oC g/cm³ 0,98
  • Active substance % NA
  • Color Colorless to yellow clear
  • Solvent NA
  • Apply with NA
  • Heat treatment necessary? No
  • Solvable in NA
  • Description 2-pack primer to improve adhesion between wood or aluminum and addition-cure catalyzed rubber. Works with silicone with very high oil content
  • Remark Primer does not need to dry or bake before further use!

Product tags

Do you have a question about this product?

Do you have a question about this product?

Our employee is happy to help you find the right product

Related products

Compare products Delete all products

You can compare a maximum of 3 products

    Hide compare box
    Silicone Primer Wacker AV (SLM 74300)

    Silicone Primer Wacker AV (SLM 74300)

    € 160,-

    Please accept cookies to help us improve this website Is this OK? YesNoMore on cookies »