SSP2390-40D
SSP2390-40D is a mid-range grade in the SSP2390 Series of platinum-cured silicone elastomers, with a Shore A durometer of 39. Tensile strength is 1,310 psi, elongation 840%, tear strength (Die B) 165 ppi, and specific gravity 1.12. Translucent base color with red, black, gray, and white available. The base material meets USP Class VI biocompatibility requirements and FDA 21 CFR § 177.2600 food-contact requirements (dry and fatty foods), and is RoHS compliant. Cure profile is 10 minutes at 177°C (350°F).
Key Properties
- Durometer (Shore A): 39
- Tensile Strength: 1,310 psi
- Elongation: 840%
- Tear Strength (Die B): 165 ppi
- Specific Gravity: 1.12
- Compliance: FDA 21 CFR § 177.2600, USP Class VI, RoHS
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- Specifications
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- General Info
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Mechanical Properties
| Property | Value | Test Method |
| Durometer (Shore A) | 39 | — |
| Tensile Strength | 1,310 psi | — |
| Elongation | 840% | — |
| Tear Strength (Die B) | 165 ppi | — |
| Specific Gravity | 1.12 | — |
Material & Process Properties
| Property | Value | Test Method |
| Material Type | Translucent Heat-Cured Silicone Elastomer | — |
| Cure System | Platinum (Pre-catalyzed) | — |
| Cure Profile | Compression cure, 10 minutes at 177°C (350°F) | — |
| Standard Colors | Translucent base; red, black, gray, white available | — |
| Supply Formats | Ready-to-mold compounds, compression molded sheet stock, roll stock | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| Food Contact Compliance | Pass — Dry food and fatty foods | FDA 21 CFR § 177.2600 |
| Biocompatibility | Compliant (base material) | USP Class VI |
| RoHS | Compliant | — |
The base material meets USP Class VI requirements; pigments used in custom Pantones need separate testing per color by the end user. Cured product has been tested per FDA 21 CFR § 177.2600 and meets requirements for contact with dry food and fatty foods.
Shelf Life / Storage
| Property | Value | Test Method |
| Compound Shelf Life | 6 months (cold storage may extend) | — |
| Cured Product Shelf Life | 15 years | — |
Compliance
- FDA 21 CFR § 177.2600 (Food Contact — Dry & Fatty Foods) — Compliant
- USP Class VI (Biocompatibility) — Compliant (base material)
- RoHS — Compliant
- Mid-range silicone seals, gaskets, and components requiring balanced stiffness and tensile strength
- USP Class VI biocompatible medical device components requiring moderate firmness
- Food-contact components under FDA 21 CFR § 177.2600 (dry and fatty foods) requiring mid-range mechanical performance
- Pharmaceutical and laboratory components requiring mid-durometer silicone elastomer service
- Custom-molded parts where tensile strength matters more than maximum elongation
Common industries: Medical device, pharmaceutical, food processing, laboratory and analytical instruments, electronic gasket converting.
SSP2390-40D is a translucent platinum-cured silicone elastomer manufactured by Specialty Silicone Products, Inc. (SSP), supplied platinum pre-catalyzed and ready for immediate use. The 40D grade has a Shore A durometer of 39, positioning it in the mid-range of the SSP2390 Series. Tensile strength of 1,310 psi reflects strong mechanical performance, with elongation of 840% maintaining reasonable deformation tolerance for the durometer.
Tear strength (Die B) of 165 ppi is higher than all softer grades. The 40D grade is well-suited for mid-range silicone applications requiring balanced firmness and tensile capability — a common general-purpose selection when neither soft conformability nor firm structural service is the priority.
Available as a ready-to-mold compound or as compression-molded sheet stock or roll stock, in a translucent base or red, black, gray, and white standard colors. Custom Pantone matching is available with the caveat that pigments require separate USP Class VI testing per color by the end user. Cure profile is 10 minutes at 177°C (350°F) compression cure. Compound shelf life is 6 months (cold storage may extend); cured product shelf life is 15 years.
Compliant with FDA 21 CFR § 177.2600 (Food Contact, Dry & Fatty Foods), USP Class VI (Biocompatibility), and RoHS.
What differentiates SSP2390-40D from other grades in the SSP2390 Series?
40D occupies the mid-range position at Shore A 39, with 1,310 psi tensile strength and 840% elongation. It represents the inflection point in the series where tensile capability becomes meaningfully higher than the softer grades while elongation is still strong. Select 40D when balanced mid-range performance matters more than extreme softness or firmness.
Why is durometer selection important when specifying SSP2390-40D?
Durometer determines stiffness, sealing pressure capability, and dimensional stability. At Shore A 39, the 40D grade is the mid-range of the SSP2390 Series — appropriate when the application calls for this specific stiffness range. For softer service consider lower-numbered grades (10D / 20D / 30D); for firmer service consider higher-numbered grades (60D / 70D / 80D).
What is the operating temperature range for SSP2390-40D?
The TDS does not publish a service temperature range. Cure profile is specified at 177°C (350°F). Specifiers requiring service temperature data should contact SSP directly.
Is SSP2390-40D suitable for medical device, food-contact, or RoHS-regulated applications?
Yes. The base material meets USP Class VI biocompatibility requirements and FDA 21 CFR § 177.2600 food-contact requirements (dry and fatty foods), and is RoHS compliant. Caveat per the TDS: pigments used in custom Pantone colors require separate USP Class VI testing per color by the end user.
How should SSP2390-40D be specified?
Specify product (SSP2390-40D), color (translucent base / red / black / gray / white / custom Pantone with separate USP Class VI testing per color), supply format (ready-to-mold compound / sheet stock / roll stock / converted die-cut), compliance requirements (FDA 21 CFR § 177.2600 / USP Class VI / RoHS as applicable), dimensional tolerances, and finished format.
