Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester vs. Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (Polynt Composites USA) achieve a 88.2% ASTM engineering compatibility score in Isophthalic & DCPD Marine Polyester Resins. Tensile strength delta is -6 MPa (-8.3%) and thermal HDT delta is -17 °C, making them interchangeable with post-cure temperature and viscosity flow adjustments.
Side-by-Side ASTM Mechanical, Thermal, Rheological & Pricing Delta
| ASTM Parameter | A: Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) | B: Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (Polynt Composites USA) | Engineering Delta (A vs. B) |
|---|---|---|---|
| OEM Manufacturer & SKU | Interplastic Corp • IPC-SIL95BA | Polynt Composites USA • POL-33750-ISO | Cross-Brand OEM Equivalent |
| ASTM D638 Tensile Strength (MPa / PSI) | 66 MPa (9,573 psi) | 72 MPa (10,443 psi) | -6 MPa (-8.3 %) |
| ASTM D648 Heat Deflection Temp (HDT °C / °F) | 75 °C (167 °F) | 92 °C (198 °F) | -17 °C (Verify Post-Cure) |
| ASTM D790 Flexural Strength (MPa) | 114 MPa | 120 MPa | -6 MPa (-5 %) |
| ASTM D2583 Barcol Hardness | 40 | 40 | 0 Barcol |
| ASTM D2196 Brookfield Viscosity @ 25°C | 460 cPs | 480 cPs | -20 cPs (-4.2 %) |
| Gel Time @ 25°C (Minutes) | 24 min | 24 min | 0 min |
| ASTM D792 Specific Density (kg/m³) | 1115 kg/m³ | 1115 kg/m³ | 0 kg/m³ |
| US DOT 49 CFR & TDG Hazmat Class | Class 3 Flammable Liquid (UN1866) | Class 3 Flammable Liquid (UN1866) | Identical (UN1866) |
| Unit Price ($/kg USD) & Pack Price | $7.8/kg • $1,755 (225 kg Steel Drum) | $7.2/kg • $1,620 (225 kg Steel Drum) | +0.6 $/kg (+8.3 %) |
| US Stocking Warehouses | Lakeland, FL • Houston, TX • Minneapolis, MN | Lakeland, FL • Houston, TX • Minneapolis, MN | 1–3 Days LTL Dispatch |
Both matrices cross-link via free-radical polymerization using 1.25%–2.0% MEKP (Methyl Ethyl Ketone Peroxide, UN3105) or Cumene Hydroperoxide (CHP) with Cobalt Octoate promoter. Low-hydrogen-peroxide MEKP (e.g., Norox MEKP-925H) is recommended to eliminate micro-foaming.
Post-Cure Schedule Adjustment Advised: ASTM D648 HDT differs by 17 °C (75 °C vs. 92 °C). For elevated-temperature tooling or dark-colored marine hulls, perform a 4–6 hour post-cure ramp at 60–80 °C (140–176 °F) to lock in full cross-link density.
Identical Hazmat Logistics Profile: Both SKUs ship under US DOT 49 CFR & Transport Canada TDG as Class 3 Flammable Liquid (UN Number: UN1866). Note 49 CFR § 177.848 segregation if ordering with Class 5.2 Organic Peroxides (UN3105).
Engineering FAQ: Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester vs. Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin
1. Is Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester a direct drop-in equivalent for Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin?▼
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (Polynt Composites USA) achieve a 88.2% ASTM engineering compatibility score in Isophthalic & DCPD Marine Polyester Resins. Tensile strength delta is -6 MPa (-8.3%) and thermal HDT delta is -17 °C, making them interchangeable with post-cure temperature and viscosity flow adjustments.
2. What is the ASTM D638 Tensile Strength and ASTM D648 HDT difference between Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin?▼
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) delivers ASTM D638 Tensile Strength of 66 MPa (9,573 psi) and ASTM D648 HDT of 75 °C, whereas Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (Polynt Composites USA) delivers 72 MPa (10,443 psi) and HDT of 92 °C. The net delta is -6 MPa (-8.3 %) tensile and -17 °C HDT.
3. Do Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin use the same catalyst or hardener cure system?▼
Both matrices cross-link via free-radical polymerization using 1.25%–2.0% MEKP (Methyl Ethyl Ketone Peroxide, UN3105) or Cumene Hydroperoxide (CHP) with Cobalt Octoate promoter. Low-hydrogen-peroxide MEKP (e.g., Norox MEKP-925H) is recommended to eliminate micro-foaming. Post-Cure Schedule Adjustment Advised: ASTM D648 HDT differs by 17 °C (75 °C vs. 92 °C). For elevated-temperature tooling or dark-colored marine hulls, perform a 4–6 hour post-cure ramp at 60–80 °C (140–176 °F) to lock in full cross-link density.
4. How do US DOT 49 CFR Hazmat shipping rules and B2B drum/pack prices compare between Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin?▼
Identical Hazmat Logistics Profile: Both SKUs ship under US DOT 49 CFR & Transport Canada TDG as Class 3 Flammable Liquid (UN Number: UN1866). Note 49 CFR § 177.848 segregation if ordering with Class 5.2 Organic Peroxides (UN3105). In US B2B distribution, Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester is priced at $1,755 per 225 kg Steel Drum ($7.8/kg) vs. $1,620 per 225 kg Steel Drum ($7.2/kg) for Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (delta: +0.6 USD/kg).
Related Drop-In Comparisons in Isophthalic & DCPD Marine Polyester Resins
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Polylite 33750-10 Isophthalic Structural Laminating Resin (Polynt Composites USA) are trademarks of their respective owners. CompositeMatrix Technologies Inc. is an independent North American B2B composite material intelligence registry; comparative ASTM D638, D648, D790, D2583, and D2196 figures are presented under the US legal doctrine of Nominative Fair Use (Lanham Act, 15 U.S.C. § 1125) and Feist Publications, Inc. v. Rural Telephone Service Co. (499 U.S. 340) for scientific and industrial cross-reference. Cure schedules, exotherm behavior, and laminate qualification must be verified by a licensed Naval Architect or Professional Engineer (PE) against current manufacturer batch Technical Data Sheets (TDS) and Safety Data Sheets (SDS).