Plastic Centering Sheets: 12mm vs 18mm Technical Specifications
Plastic centering sheets engineered from 100% industrial packaging waste deliver superior durability over timber plywood in slab formwork, column centering, and vibro-compaction applications. PAC® Centering Sheets are reinforced with XLP fiber, aluminum oxide, and metal dust powder—achieving certified compressive strength of 22.0 N/mm², zero water absorption, and static load capacity up to 7500kg. Available in 12mm Standard White (30–40 reuse cycles) and 18mm Premium Black (60+ cycles) variants, both IS 16058 compliant and NABL-certified by Choksi Laboratories and STEDRANT Technoclinic.
| Specification | 12mm Standard White | 18mm Premium Black | IS 16058 Standard |
|---|---|---|---|
| Compressive Strength | 22.0 N/mm² | 22.0 N/mm² | ≥20 N/mm² |
| Density | 1130 kg/m³ | 1150 kg/m³ | 1100–1200 kg/m³ |
| Moisture Content | 0.33–0.64% | 0.33–0.64% | ≤2.0% |
| Water Absorption | 0% (Zero Swelling) | 0% (Zero Swelling) | ≤5% after 24h immersion |
| Static Load Capacity (Max) | 7500 kg | 7500 kg | Type-dependent (500–1000 kg/sq.ft.) |
| Reuse Cycles | 30–40 (before scrap value) | 60+ (high-rise/bridge work) | N/A (durability-dependent) |
| Sheet Weight | ~40 kg (8ft × 4ft) | ~45 kg (8ft × 4ft) | N/A |
| Tensile Strength | 11.30–11.89 N/mm² | 11.30–11.89 N/mm² | ≥10 N/mm² |
Lab Certification & NABL Accreditation
All PAC® Plastic Centering Sheets are tested and certified by NABL-accredited laboratories—Choksi Laboratories Limited and STEDRANT Technoclinic Pvt. Ltd.—conforming to Bureau of Indian Standards (BIS IS 1734, IS 16058:2024). Laboratory reports confirm zero water absorption even after infinite submersion, compressive strength exceeding 20 N/mm² minimum, and durability under repeated vibro-compaction cycles. Certificate of Analysis includes impact drop testing (1-meter vertical drop, corner drop within 40mm deviation) and chemical resistance (acid/alkali pass), validating long-term structural integrity in harsh site conditions.
Material Composition & Durability Advantage
PAC® Centering Sheets are engineered from 100% pure industrial packaging waste (sourced from Patanjali, Nestlé production lines), reinforced with XLP polymer fiber, aluminum oxide, and metal dust powder. This composition delivers density of 1130–1150 kg/m³—significantly higher than low-grade scrap boards (800–900 kg/m³)—preventing internal fiber cracking under repetitive vibro-compaction loads. Moisture content remains stable at 0.33–0.64%, ensuring dimensional consistency and eliminating warping or swelling common in timber plywood after moisture exposure. Unlike conventional wooden shuttering, PAC® boards retain structural integrity across 30–60 reuse cycles before achieving 40% scrap value credit.
Performance Comparison: 12mm vs 18mm
| Criterion | 12mm Standard | 18mm Premium |
|---|---|---|
| Best For | Residential slabs, standard formwork | Heavy columns, bridges, hydro-dams |
| Price (per sq. ft.) | ₹80–₹90 (White/Black) | ₹125 |
| Reuse Life | 30–40 cycles | 60+ cycles |
| Vibro-Compaction Durability | Excellent (paver/fly-ash brick) | Superior (high-frequency loading) |
| Scrap Value After Use | 40% credit (₹32–₹36/sq.ft.) | 40% credit (₹50/sq.ft.) |
Vibro-Compaction Performance for Paver & Fly-Ash Brick Production
PAC® Centering Sheets excel in high-frequency vibro-compaction environments where wooden pallets and low-grade plastic boards routinely fail. The reinforced XLP-metal dust composition absorbs impact energy without permanent deformation or micro-cracking. Laboratory impact-drop tests (1-meter vertical drop, 60kg corner hammer strike) confirm zero structural damage, ensuring consistent mold release cycles across fly-ash brick and paver block production lines. Field deployments across 4000+ brick plants in 90 Indian cities have logged 60+ consecutive vibro-compaction cycles per board—unmatched by conventional alternatives.
Installation Best Practices & Site Workability
Stripping Formwork: PAC® boards are nailed, screwed, and cut identically to timber plywood. Nail extraction leaves zero surface marks due to internal fiber re-setting. Stripping time per cycle: 8–12 minutes (compared to 15–20 minutes for hardwood shuttering).
Transport & Handling: Indestructible in transit; loose sheet shipment via TCI/VRL/Safexpress reduces packaging waste. Each sheet withstands forklift handling and on-site stacking without delamination.
Surface Finish: Mirror-polished face requires zero secondary plastering on concrete finish—eliminating 10
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“text”: “Yes. PAC® Plastic Centering Sheets are IS 16058:2024 certified by NABL-accredited laboratories (Choksi Laboratories Limited and STEDRANT Technoclinic Pvt. Ltd.), confirming compliance for vertical impact drop, corner drop, and hammer-impact durability testing. Laboratory certification ensures reliability in industrial warehousing and construction applications.”
