Altropol AltroFoam SF 50 – Lightweight Flexible PU Casting Foam for Backfilling & Industrial Parts

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Altropol

Altropol AltroFoam SF 50 – Lightweight Flexible PU Casting Foam for Backfilling & Industrial Parts

✔ Light, flexible 2K polyurethane foam
✔ Free-rise density 50 kg/m³
✔ Mixing ratio 100 : 50 by weight (2 : 1)
✔ Start time approx. 11 seconds
✔ Mixed viscosity 500 mPa·s
✔ Professional use: diisocyanate training required Read more

€55,95 Incl. BTW

SKU: S11596

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1.5 kg Set (A + B)

€55,95

€37,30/kg

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✔ Light, flexible 2K polyurethane foam
✔ Free-rise density 50 kg/m³
✔ Mixing ratio 100 : 50 by weight (2 : 1)
✔ Start time approx. 11 seconds
✔ Mixed viscosity 500 mPa·s
✔ Professional use: diisocyanate training required

Lightweight, flexible polyurethane casting foam for backfilling

Altropol AltroFoam SF 50 is a two-component flexible polyurethane foam with a low density. You mix component A and component B at the simple ratio of 100 : 50 by weight (2 : 1). At 500 mPa·s at 25 °C the mixed system is very fluid, and the start time is approx. 11 seconds. Free-rise, you get a light, compressible foam with a density of 50 kg/m³. The blowing agent contains no fluorinated hydrocarbons.

⚠️ Mandatory training for professional use

Component B of AltroFoam SF 50 contains diisocyanates. Since 24 August 2023, industrial or professional users may only process this product if they have completed the mandatory training on the safe use of diisocyanates (REACH Annex XVII, entry 74).

Companies can register their staff via safeusediisocyanates.eu. You will find more information on our page safe working with polyurethane and diisocyanates.

Key benefits

Low density: 50 kg/m³ free-rise, so a light and flexible foam.
Simple mixing ratio: 100 : 50 by weight, or 2 : 1.
Very fluid: 500 mPa·s mixed, so the foam fills cavities easily.
No fluorinated blowing agents: the blowing agent contains no fluorinated hydrocarbons.
No preheated mould needed: free-rise in unheated cavities and moulds.

Typical applications

✓ Industrial parts
✓ Backfilling of cavities
✓ Light, flexible fillings for objects

Processing

Bring both components to at least 20 °C and work in a dry room. The system is sensitive to moisture.
Stir component A intensively in its original container.
Weigh A and B accurately at a ratio of 100 : 50 by weight (95 : 41 by volume). For small quantities, use scales accurate to 0.01 gram.
Mix briefly and intensively with a high-speed stirrer at approx. 1,000 rpm. Work quickly: the start time is approx. 11 seconds.
Pour the mixture immediately into the cavity or mould in a steady stream and let it rise freely. No preheating is needed for this. For rigid parts, preheat the mould to 45 to 50 °C.
Close the containers tightly straight after each use.

Points of attention

✓ If the mixing ratio deviates by more than 3 %, you will not achieve the stated properties.
✓ Larger quantities and higher temperatures shorten the working time considerably. Do not mix too much material at once.
✓ Altropol has not yet published the rise and cure times. Run a small test first with a new mould or cavity.
✓ Do not use wooden spatulas or stirring sticks.
✓ Store the product in its tightly closed original container at 20 to 25 °C. The shelf life is shown on the label. Use opened containers as soon as possible.

Professional support

Not sure about the right mould, mixing method or quantity for your foam part? Email us at info@siliconesandmore.com and we will help you choose.

Safety Information

Component A of this product is classified as causing serious eye irritation (H319). Component B is classified as causing skin irritation (H315) and serious eye irritation (H319), may cause an allergic skin reaction (H317) and may cause allergy or asthma symptoms or breathing difficulties if inhaled (H334). Component B is suspected of causing cancer (H351) and may cause damage to organs through prolonged or repeated exposure (H373). Contains isocyanates and may produce an allergic reaction (EUH204). Signal word: Danger. Only work in a well-ventilated room and do not breathe vapour or mist. Wear protective gloves, protective clothing and eye protection, and wear respiratory protection if ventilation is inadequate. Wash your hands thoroughly after work. Avoid release to the environment and store the product locked up. Training on the safe use of diisocyanates is mandatory for industrial or professional use. Always consult the supplied safety data sheet (SDS) for full information on hazards, handling, storage and first aid.

Safety Pictograms	Safety Data Sheets (SDS)
	📥 EN TDS Altropol AltroFoam SF 50

Signal Word	H‑code	Hazard Statement	P‑codes	P‑statements
Warning	EUH204		-	-
Warning	H315	Causes skin irritation	P264 P280 P302+P352 P333+P313	Wash thoroughly after handling Wear protective gloves/clothing/eye protection/face protection IF ON SKIN; wash with plenty of water and soap If skin irritation or rash occurs; get medical advice/attention
Warning	H317	May cause an allergic skin reaction	P261 P272 P280 P302+P352 P333+P313 P362+P364	Avoid breathing vapours/spray Contaminated work clothing should not be allowed out of the workplace Wear protective gloves/clothing/eye protection/face protection IF ON SKIN; wash with plenty of water and soap If skin irritation or rash occurs; get medical advice/attention Take off contaminated clothing and wash before reuse
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
Danger	H334	May cause allergy or asthma symptoms or breathing difficulties if inhaled	P261 P284 P342+P311	Avoid breathing vapours/spray Wear respiratory protection in case of inadequate ventilation If experiencing respiratory symptoms; call a POISON CENTER/doctor
Warning	H351	Suspected of causing cancer	P201 P202 P280 P308+P313 P405 P501	Obtain special instructions before use Do not handle until all safety precautions have been read and understood Wear protective gloves/clothing/eye protection/face protection IF exposed or concerned; get medical advice/attention Store locked up Dispose of contents/container in accordance with local regulations
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

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

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Our story began with our father, the founder of Nedform BV. We— Roel, Rutger, and Rob Collaris —are his sons and wanted to bring his passion and knowledge to the online world. That's how SAM (Silicones and More) was born—a creative space for everyone.

Whether you're a beginner, an expert, or an enthusiastic DIYer looking for the right tools, materials, and some guidance, you've come to the right place. We've worked with silicones, resins, and casting materials ourselves for years. That's why we not only deliver quality but also genuine support—based on experience.

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FAQs

What is the delivery time of my order?

Orders placed and paid for on business days will be shipped on the same day in most cases. Orders received on weekends will be processed on the next business day.

We always do our best to ship orders as quickly as possible, but actual shipping times may vary due to high volume, stock availability, or carrier circumstances.

Delivery time depends on the destination country and the carrier. Below is a general indication:

Netherlands: usually within 1 business day
Belgium & Germany: typically within 1–2 business days
Other countries: depends on the destination and the local carrier

Please note: these are guidelines, not guarantees. The final delivery time may differ due to factors beyond our control, such as sorting center delays, public holidays, or exceptionally high volume.

What is the return policy?

We offer a 30-day return policy as an added service. If you'd like to return an item or if there's something wrong with your order, please email us at info@siliconesandmore.com with your name and order number within 30 days of delivery. We'll help you quickly. The full terms and conditions can be found on our returns page.

How can I track my order?

Once your order has been processed and shipped, you'll receive a track and trace code by email, allowing you to easily track your package. Please note that it can sometimes take up to 24 hours after processing for the track and trace to be active.

I have a problem with my order, how can I reach you?

If you have any questions or run into any problems, please feel free to contact us via our contact page or email us at info@siliconesandmore.com . We'll be happy to help you quickly.

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Can I also order for business purposes?

Yes, business orders are possible . Customers within the EU outside the Netherlands can order VAT-free with a valid EU VAT number (0 percent intra-Community supply).

Enter your VAT number on the shopping cart page , not at checkout.

Go to the shopping cart via the link below and enter your VAT number and email address, after which the VAT will be automatically removed.

https://siliconesandmore.com/cart

Please note that if you only enter your VAT number at checkout, it will not be processed correctly and VAT may still be charged.

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Altropol AltroFoam SF 50 – Lightweight Flexible PU Casting Foam for Backfilling & Industrial Parts

Altropol AltroFoam SF 50 – Lightweight Flexible PU Casting Foam for Backfilling & Industrial Parts

Pairs well with

Lightweight, flexible polyurethane casting foam for backfilling