Wacker® Catalyst T 40 – Hardener for Condensation Silicones (Tin-Cure Catalyst)

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Wacker Wacker® Catalyst T 40 – Verharder voor Condensatie Siliconen (Tin-Cure Katalysator)

✔ 2-3% dosage✔ Medium fast✔ Can be used pure or mixed✔ Low shrinkage (< 0.3%)

€5,87

incl. VAT (21%) €4,85 excl. VAT

S10686

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All technical specifications, safety information and data sheets remain available below.

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Fast Tin-Cure Catalyst for ELASTOSIL® M Condensation Silicones

Wacker® Catalyst T 40 is an organotin catalyst (organotin compound + silicate ester) specially developed as a fast hardener for condensation-curing ELASTOSIL® M RTV-2 silicones. T 40 is the standard catalyst for ELASTOSIL® M 4503 and the fast catalyst for ELASTOSIL® M 4400, M 4440, and M 4470. With a dosage of 2%, T 40 provides a pot life of approximately 30–50 minutes and a demolding time of 3–4 hours at 23°C / 50% RH — significantly faster than the T 37 catalyst. The viscosity is only 2 mPa·s, allowing the catalyst to mix homogeneously with the silicone base effortlessly.

T 40 can also be combined with Catalyst T 47 for even faster curing (blend ratio T 40:T 47 = 95:5 gives a pot life of ~20–40 min, demolding time ~4–6 hours). At 3% dosage, the pot life is approximately 30 minutes with a demolding time of 2 hours.

Properties

Fast catalyst for M-series condensation silicones: standard for M 4503, fast option for M 4400, M 4440, and M 4470.
Dosage 2–3% by weight: at 2% approximately 30–50 min pot life and 6–7 hours demolding time; at 3% approximately 30 min pot life and 2 hours demolding time.
Extremely low viscosity (2 mPa·s): mixes directly and homogeneously without clumping.
Compatible with T 47: blend for intermediate or very fast custom curing.
Colorless dark: neutral in color, does not significantly affect the final color of the silicone.

Dosage Table

The values below apply at 23°C / 50% relative humidity for ELASTOSIL® M 4400, M 4440, and M 4470:

2% T 40 → pot life 30–50 min, demolding time 6–7 hours
3% T 40 → pot life ~30 min, demolding time ~2 hours
T 40:T 47 = 95:5 at 5% total → pot life 20–40 min, demolding time 4–6 hours
T 40:T 47 = 90:10 at 5% total → pot life 10–20 min, demolding time 2–4 hours

Processing Instructions

Weigh the silicone base component and calculate the catalyst dosage (2–3 parts by weight T 40 per 100 parts by weight base).
Add the catalyst to the base and mix thoroughly for at least 2 minutes. Scrape the walls and bottom of the mixing vessel.
Process the mixture within the pot life. Never prepare more than can be processed within the pot life.
Pour into the mold and allow to cure at room temperature (min. 40% relative humidity). If humidity is too low, the surface may remain tacky.
Wait to demold until the silicone has fully cured.

Please note: pot life and demolding time are highly dependent on the dosage and humidity. At higher humidity or higher dosage, condensation silicones cure faster. More catalyst accelerates curing but also increases shrinkage and accelerates the aging of the mold.

Manufactured by Wacker Chemie AG, Munich, Germany.

Application

Silicone type["Auxiliary material"]Type of silicone or polymer

Safety Information

Wacker Catalyst T 40 is classified as a hazardous product according to GHS/CLP Regulation (EC) No. 1272/2008. The product contains tetraethyl silicate (50–60%) and bis(neodecanoyloxy)dioctylstannane (20–30%). Signal word: Warning. H-phrases: H226 Flammable liquid and vapour (flash point 34°C). H319 Causes serious eye irritation. H335 May cause respiratory irritation. H373 May cause damage to organs through prolonged or repeated exposure by inhalation. H413 May cause long lasting harmful effects to aquatic life. Personal protective equipment: tight-fitting safety goggles according to EN 166 compulsory. Gloves of butyl rubber (thickness > 0.3 mm, breakthrough time > 480 min) compulsory. Chemical protective clothing recommended. In case of exposure above limit values: full-face mask with ABEK filter (EN 136/EN 14387). Always work in a well-ventilated area. Keep away from heat, sparks, and open flames. No static discharges. Consult the full SDS for extensive information on storage, transport, and waste disposal.

Safety Pictograms	Safety Data Sheets (SDS)
GHS hazard pictograms Required protection (ISO 7010)	📥 EN SDS Catalyst T 40

Signal Word	H‑code	Hazard Statement	P‑codes	P‑statements
Warning	H226	Flammable liquid and vapour	P210 P233 P280 P303+P361+P353 P370+P378	Keep away from heat, hot surfaces, sparks, open flames and other ignition sources Keep container tightly closed Wear protective gloves/clothing/eye protection/face protection IF ON SKIN (or hair); take off immediately all contaminated clothing. Rinse skin with water/shower In case of fire; use appropriate extinguishing media
Warning	H319	Causes serious eye irritation	P264 P280 P305+P351+P338 P337+P313	Wash thoroughly after handling Wear protective gloves/clothing/eye protection/face protection IF IN EYES; rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing If eye irritation persists; get medical advice/attention
Warning	H335	May cause respiratory irritation	P261 P271	Avoid breathing vapours/spray Use only outdoors or in a well-ventilated area
Warning	H373	May cause damage to organs through prolonged or repeated exposure	P260 P501	Do not breathe dust/fume/gas/mist/vapours/spray Dispose of contents/container in accordance with local regulations
Warning	H412	Harmful to aquatic life with long lasting effects	P273 P501	Avoid release to the environment Dispose of contents/container in accordance with local regulations

More information about H and P statements: UK HSE &ECHA

Technical data sheets

Frequently asked questions

What is the delivery time for my order?

Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.

Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.

What is the return policy?

You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.

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Can I order as a business?

Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.

EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.

Wacker® Catalyst T 40 – Hardener for Condensation Silicones (Tin-Cure Catalyst)