Momentive Silopren LSR Topcoat HE – Matting and Abrasion Resistant Silicone Coating for LSR, HTV & RTV
Momentive Silopren LSR Topcoat HE – Matting and Abrasion Resistant Silicone Coating for LSR, HTV & RTV
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Matting and durable coating for silicone surfaces
Silopren LSR Topcoat HE is a two-component silicone coating that you apply to cured silicones to mattify the surface and give it a durable finish. Momentive developed the coating as a durable layer for printed silicone elastomers based on LSR. Mixing is done 1:1, the mixed product remains workable for three days at 20 °C, and curing takes place in a ventilated hot air oven at 100 to 180 °C. The HE addition stands for high elongation; the layer stretches with a flexible substrate.
Key benefits
- Excellent adhesion to silicones: suitable for LSR, heat-curing silicone rubbers (HTV) and room-temperature vulcanisates (RTV). The surface only needs to be dust and grease-free; no further pretreatment is necessary.
- High elongation: the layer does not tear immediately when the silicone substrate bends or stretches.
- Abrasion resistant: 100 cycles on the Norman Tool Tester at 175 g and 50 µm dry film thickness.
- Matte, colourless finish: removes the gloss from the surface without changing the colour of the underlying material.
- High reactivity: the coating crosslinks quickly as soon as the layer reaches temperature.
- Neutral odour and taste: the cured layer does not emit its own odour or taste.
- Stable and flexible at low temperatures: the layer remains flexible when the part gets cold.
- Long pot life: three days at 20 °C, so you don't have to mix per charge.
⚠️ Industrial product, not a DIY coating
Two reasons why this product does not belong in a hobby workshop:
- ✓ Curing can only be done in an oven. The datasheet specifies one route: 100 to 180 °C in a ventilated hot air oven, immediately after spraying. Without this equipment, the coating will not cure as intended.
- ✓ Component A consists of 90 to 100% decamethylcyclopentasiloxane (D5, CAS 541-02-6). Momentive lists this substance in the safety data sheet under REACH Annex XVII, substances subject to restrictions on placing on the market and use, and on the candidate list of substances of very high concern. We therefore supply this product for industrial processing, including surface treatment of non-metallic parts.
If you are unsure whether your application falls under this, please contact us before ordering.
⚠️ What FDA and BfR compliance does and does not say
Momentive declares that the ingredients with which LSR Topcoat HE is formulated comply with 21 CFR 177.2600, rubber articles intended for repeated use, and with BfR recommendation XV Silicone. This is a statement about the composition, not about your end product.
- ✓ Compliance applies to the material as supplied by Momentive
- ✓ Layer thickness, degree of curing, oven temperature, and the substrate also determine whether your coated part complies
- ✓ Both regulations set requirements for extractable substances, which you test on the end product
If you manufacture parts for repeated food contact, have the coated end product assessed by an accredited laboratory. There is no USP Class VI or ISO 10993 assessment for LSR Topcoat HE. These tests belong to the standard LSR Topcoat (TP 3719), a different product with different properties.
Typical applications
- ✓ Matting of glossy silicone parts
- ✓ Durable finish for printed LSR parts, such as keypads and control panels
- ✓ Protective layer on silicones that are mechanically stressed or bent
- ✓ Finishing of HTV and RTV parts that require a matte appearance
- ✓ Parts for repeated food contact, within the frameworks mentioned above
Processing
- Stir or shake component A and component B thoroughly and separately before use.
- Weigh A and B in a 1:1 ratio.
- Mix for approximately 5 minutes with a suitable mixer at a moderate shear rate.
- Ensure that the surface to be coated is dust and grease-free; no further pretreatment is necessary.
- Apply the coating by spraying. For longer spraying sessions, use a continuous mixing device in the supply tank to keep the mixture homogeneous.
- Cure immediately after spraying in a ventilated hot air oven at 100 to 180 °C. Ensure sufficient fresh air supply, otherwise surface disturbances may occur.
- Clean tools and equipment with a non-polar solvent.
The datasheet does not specify a fixed curing time; this depends on the oven temperature and layer thickness. A higher temperature of the mixed product significantly shortens the processing time.
Precautions for use
- ✓ This is an addition system. Sulfur-containing clay, latex, PVC, uncured polyurethane and epoxy, cyanoacrylate, and residues of condensation silicones can inhibit curing. If in doubt, test on a sample piece first.
- ✓ Component A has a flash point of 73 °C and component B of 76 °C. Keep the coating away from open flames and hot surfaces, and ensure good ventilation during spraying.
- ✓ The product is classified as H412, harmful to aquatic life with long-lasting effects. Prevent release into the environment and dispose of residues and packaging via an authorized processor.
- ✓ Shelf life 6 months from production date, in the original sealed packaging, stored dry at a maximum of 27 °C and less than 60% relative humidity. The exact date is stated on the analysis certificate.
- ✓ Use component A and component B only together as supplied and do not interchange caps.
Professional support
If you want to know if LSR Topcoat HE adheres to your specific silicone, or if you need documentation on FDA and BfR compliance, please contact us at info@siliconesandmore.com. Please provide information about the base material, the desired layer thickness, and the oven temperature you have available, and we will determine if this is the correct coating or if the standard LSR Topcoat is a better fit.
Product Properties
- ColorMatte transparentColor of the finished product
- TransparencyTranslucentDegree of transparency
- Viscosity400mPa·sViscosity of the uncured silicone
- Mix ratio1:1Mixing ratio A : B
Component Properties
- Color AOff-whiteColor of component A
- Color BOff-whiteColor of component B
- Density A0.996g/cm³Density of component A
- Density B0.993g/cm³Density of component B
Certification & Safety
- Food-gradeYesSuitable for food contact
Application
- Use caseIndustrial coating of silicone parts, matt and wear-resistantIntended use
- Silicone type["Addition curing","Coating"]Type of silicone or polymer
Safety Information
Read the safety data sheet for component A and component B before use. Spray only in a well-ventilated area and wear nitrile gloves, eye protection, and respiratory protection. Both components have a flash point of 73 to 76 °C, keep the coating away from open flames and hot surfaces. The product is classified as H412, harmful to aquatic life with long-lasting effects. Avoid release to the environment and dispose of residues and packaging through an approved processor. Keep out of reach of children.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H412 | Harmful to aquatic life with long lasting effects | P273 P501 |
|
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.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
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.