Overview
The SMA31-40 Backing Card is a high-quality substrate designed specifically for the assembly of lateral flow diagnostic tests. This 30cm long ,7.5cm wide raw material strip provides the rigid support and adhesive precision necessary to ensure consistent flow and accurate results.
Whether you are developing COVID-19 tests, pregnancy tests, or environmental assays, the SMA31-40 offers the structural integrity required for both manual assembly and automated lamination.
Key Features
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High-Tack Adhesive: Pre-applied pressure-sensitive adhesive (PSA) ensures that membranes, conjugate pads, and wicking pads stay locked in place without “creeping” over time.
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Optimal Rigidity: The 30cm card provides a flat, stiff surface that prevents the nitrocellulose membrane from cracking or bending during the cutting and housing process.
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Chemical Compatibility: Inert plastic construction won’t interfere with reagents or biological samples.
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Precision Manufacturing: Uniform thickness across the entire 30cm strip ensures consistent pressure when used in plastic housings.
| Feature | Specification |
| Material Grade | SMA31-40 (Industry Standard) |
| Length/wide | 30cm/7.5cm |
| Application | Lateral Flow Assay (LFA) Backbone |
| Adhesive Type | Pressure-Sensitive (Peel-and-Stick) |
| Compatibility | Nitrocellulose, Glass Fiber, Cellulose Pads |
Assembly Benefits
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Easy Lining: The backing is designed for easy alignment of the NC membrane, which is critical for maintaining the T and C line positions.
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Clean Cutting: Engineered to be cut into strips (typically 3mm to 5mm wide) using a guillotine or rotary cutter without the adhesive gumming up the blades.
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