Ecotherm 4" x 4" Direct Thermal Square Shipping Labels — 1" Core Rolls

Ecotherm 4" x 4" direct thermal labels are 75gsm matte white paper labels with permanent hot melt adhesive, manufactured for square shipping, e-commerce fulfillment, and carton-packaging applications and compatible with all major direct thermal desktop printers. Built for daily use across e-commerce, retail, warehouse, and industrial environments. Specifications Face stock: 75gsm direct thermal paper, matte finish, white Adhesive: permanent hot melt Liner: 60gsm white glassine Configuration: single row, perforated, gap sensing, 1" core Print method: direct thermal only — no ribbon required (not for thermal transfer printers) Service temperature: 5°F to 149°F (−15°C to 65°C) Minimum application temperature: 50°F (10°C) Shelf life: 1 year at 73°F (23°C) / 50% relative humidity Performance: loop tack ≥14 N; 90° peel adhesion ≥7 N/25mm Test methods: GB/T 451.2, GB/T 7974, FTM2, FTM9 Common applications Square shipping and parcel labels Carton and product packaging labels E-commerce fulfillment box labels Return shipping labels Warehouse and logistics labels Surface compatibility Adheres reliably to corrugated cardboard, paperboard, glass, and most rigid plastics greater than 1" / 25mm in diameter. Not recommended for PVC surfaces, bottles 1" / 25mm or smaller in diameter, or applications requiring direct food contact (suitable for non-direct-contact food, medical, and cosmetic packaging). Printer compatibility Compatible with major direct thermal desktop printers including Zebra (ZD220d, ZD230d, ZD420d, ZD421d, ZD620d, ZD621d, GK420d, GX420d, ZP450), Rollo (X1040, X1038, X1036), MUNBYN (ITPP941, ITPP130, RW402B, P44S), DYMO LabelWriter 4XL, JADENS (JD-168, JD-268, JD-328BT, JD-468BT), POLONO (PL60, PL420, PL70E), iDPRT (SP410, SP420, SP450), Phomemo (PM-241-BT, D520-BT, PM-246S), Arkscan (2054A, 2054K, 2054N, 3044C), TSC (DA210, DA310), Citizen (CL-S521, CL-E321), Bixolon (SLP-DX420), and Godex (DT4x). For the full verified list, see the Printer Compatibility page. Not compatible with thermal transfer printers, DYMO 5XL or 550-series, or Brother QL-series cartridge printers. Direct replacement for These labels are a direct replacement for part numbers 10010033, 10015345, RDT4-400400-1P, RD-4-4-380-1, RD-4-4-700-1. Shipping and ordering Ships from US warehouses with same-day shipping on orders placed before 1 PM CT. Volume pricing applies automatically on case quantities — see variant options below for available pack sizes. Net 30 terms available for qualified business accounts; contact us to apply. BPA-free and BPS-free: the white direct thermal facestock is independently tested by SGS (June 2026) with both BPA and BPS not detected — a confident choice where material safety matters.