Double A vs JK Copier vs Xerox vs Rotatrim vs Reflex: Lab Specs & 20GP Wholesale Comparison

Benchmark Brand & Grade	Nominal GSM (ISO 536:2019)	Caliper & Apparent Bulk (ISO 534:2011)	CIE Whiteness & D65 Brightness	Bendtsen Roughness (ISO 8791-2:2013)	Primary Regional Tender Market
Double A Premium 80G	80 g/m2	108 - 112 um (1.38 cm3/g)	165 CIE / 102% - 104% D65 (ISO 2470-2:2008)	100 - 120 mL/min	Southeast Asia, Middle East, Global ministries
JK Copier Red 75G / 80G	75 / 80 g/m2	104 - 109 um (1.39 cm3/g at 75g)	160 - 162 CIE / 98% - 101% D65 (ISO 2470-2:2008)	130 - 150 mL/min	South Asia, East Africa, MENA corporate tenders
Xerox Performer / Premier	75 / 80 g/m2	104 - 108 um (1.34 cm3/g)	158 - 164 CIE / 98% - 102% D65 (ISO 2470-2:2008)	120 - 150 mL/min	Europe, Latin America, Managed Print Services
Rotatrim Mondi Spec 80G	80 g/m2	106 - 110 um (1.35 cm3/g)	164 CIE / 102% D65 (ISO 2470-2:2008)	115 - 140 mL/min	West/Southern Africa, UK/Commonwealth tenders
Reflex Ultra White 80G	80 g/m2	107 - 110 um (1.36 cm3/g)	165 CIE / 102% - 104% D65 (ISO 2470-2:2008)	110 - 135 mL/min	Oceania, Asia-Pacific commercial print centers

Wholesale stationery importers and government tender officers rarely buy a copy paper brand for its box artwork alone. When buyers open a multi-container letter of credit under USITC Harmonized Tariff Schedule heading 4802.56.00, they need jam-free 90 ppm laser performance and strong per-container margins.

Compiled by Dr. Wei Chen and reviewed by the quality testing desk at the GUANHE Paper Mill and QC Lab, this laboratory guide compares the five top A4 brands across thickness, whiteness, ash content, and container math. Buyers ready to request multi-brand or factory-equivalent quotes can review our A4 copy paper specifications and 20GP import guide, inspect our A4 copy paper wholesale page, or browse the full JK Paper brand series overview.

Apparent Bulk, Caliper, and Bending Stiffness Across Global A4 Brands

Why does a 75 gsm sheet from one mill feel stiffer than an 80 gsm sheet from a discount broker? The difference comes from single-sheet caliper thickness (um), basis weight (g/m2), and mineral filler loading.

Apparent bulk is the inverse of sheet density, calculated by dividing caliper in micrometers (ISO 534:2011) by basis weight in grams per square meter (ISO 536:2019). Because cubic bending stiffness under ISO 2493-1:2010 scales with the third power of thickness (t^3), raising caliper by 5% increases flexural rigidity by 15.8% (ISO 2493-1:2010).

Use the apparent bulk equations below to compare how each brand runs after conditioning at 23 degrees Celsius and 50% relative humidity per the ASTM D685-17 conditioning standard.

• Double A 80 GSM High-Smoothness Profile: At 110 um average caliper and 80 g/m2 basis weight, apparent bulk equals 110 / 80 = 1.375 cm3/g (density 0.727 g/cm3). High-aspect-ratio eucalyptus fibers tracked in FAO forest product statistics give Double A strong machine-direction stiffness (>= 135 mN) at 100 ppm laser fuser exits.
• JK Copier 75 GSM High-Bulk Engineering: Calendered with gentle nip pressure to preserve fiber loft, JK Copier 75 gsm reaches 105 um caliper at 75 g/m2 (105 / 75 = 1.400 cm3/g). This extra bulk lets a 2.339 kg ream of 75 gsm paper match standard 104 um 80 gsm stiffness while saving 6.25% fiber mass (ISO 536:2019).
• Xerox Performer vs Premier Tier Split: Xerox markets two distinct tiers globally. Entry-level Xerox Performer (80 gsm, 104 to 106 um caliper, 1.31 cm3/g bulk) serves monochrome office fleets, while Xerox Premier (108 to 112 um caliper) handles heavy color toner.
• Rotatrim and Reflex Eucalyptus Stiffness: Both Rotatrim (108 um caliper, 1.35 cm3/g bulk) and Reflex Ultra White (109 um caliper, 1.36 cm3/g bulk) keep cross-direction stiffness above 55 mN (ISO 2493-1:2010). That rigidity stops output-tray curl in humid coastal offices.

How Do D65 Brightness, CIE Whiteness, and Ash Content Differ?

Importers comparing supplier certificates frequently encounter two optical metrics that look similar on paper but measure different wavelengths of light. Understanding optical brightener loading and calcium carbonate ash percentage prevents toner dusting complaints in managed print contracts.

Ash content is the inorganic mineral residue left after igniting paper at 525 degrees Celsius (ISO 1762:2019) or 900 degrees Celsius (ISO 2144:2019). In alkaline woodfree papermaking, ash content reflects the loading of precipitated calcium carbonate (PCC) filler added to boost sheet opacity (ISO 2471:2008) and brightness (ISO 2470-2:2008).

Optical brightening agent (OBA) is a stilbene fluorescent compound added to pulp or surface starch that absorbs invisible ultraviolet light and re-emits blue light at 457 nanometers. Higher OBA dosing raises outdoor D65 whiteness (ISO 11475:2017) above 164 CIE for high-contrast color graphics.

Excessive mineral filler above 22% ash (ISO 1762:2019) weakens inter-fiber hydrogen bonding and sheds abrasive white dust onto copier pickup rollers. Conversely, keeping PCC ash between 14% and 18% (ISO 1762:2019) satisfies Library of Congress ISO 9706 archival permanence standards without sacrificing tensile strength or photoreceptor drum life.

1. High-OBA Ultra-White Route (Double A, Rotatrim & Reflex): These three brands dose stilbene whitening agents that boost outdoor D65 whiteness (ISO 11475:2017) to 164 to 168 CIE and D65 brightness to 102% to 104% (ISO 2470-2:2008).
2. Natural Warm-White Corporate Spec (JK Copier & Xerox Performer): Standard JK Copier and Xerox Performer lines target 158 to 162 CIE whiteness (98% to 101% D65 brightness under ISO 2470-2:2008). Many banking, legal, and school exam boards prefer this balanced brightness because it reduces eye glare under indoor LED office lighting.
3. Bendtsen Surface Smoothness (ISO 8791-2:2013): Double A and Reflex calender their sheet surfaces to 100 to 130 mL/min Bendtsen air leakage, producing crisp halftone dots on color laser charts. Standard commercial copier grades run at 130 to 160 mL/min, providing controlled friction for worn rubber feed tires in older office printers.

Brand-by-Brand Wholesale Positioning and GUANHE Mill-Direct Equivalents

Stocking all five international brands allows regional paper wholesalers to capture every buyer tier, from price-sensitive school tenders to executive law firms. At GUANHE Paper Mill, we supply both original wholesale container allocations and mill-direct OEM equivalents across our A4 copy paper catalog. Every shipment carries FSC Chain-of-Custody certification and plot-level geolocation records compliant with the EU Deforestation Regulation (EUDR).

Product Page & Brand	Core Technical Strength	20GP Container Packing (HS 4802.56.00)	Best Wholesale Buyer Application
Double A 80 GSM A4 Paper	100 - 120 mL/min Bendtsen smoothness; low-dust rotary cut	8,000 reams floor (19.96 MT net) / 7,800 pallet	Flagship retail distribution, government tenders, and 100 ppm copy shops
JK Copier 75 GSM A4 Paper	1.40 cm3/g high-bulk stiffness; ColorLok fast-dry ink tech	8,000 reams floor (18.71 MT net) / 7,800 pallet	High-volume corporate duplex printing and cost-per-ream optimization
JK Copier 80 GSM A4 Paper	Balanced 162 CIE whiteness; 4.2% - 4.5% (ISO 287:2017) moisture	8,000 reams floor (19.96 MT net) / 7,800 pallet	Institutional banking, hospital billing, and regional stationery dealers
Xerox A4 Copy Paper	Calibrated surface resistivity for laser & xerographic drums	8,000 reams floor (19.96 MT net) / 7,800 pallet	Managed print service (MPS) providers and corporate equipment leases
Rotatrim 80 GSM A4 Paper	Heavy moisture-barrier PE wrapper; 164 CIE high opacity (95%, ISO 2471:2008)	8,000 reams floor (19.96 MT net) / 7,800 pallet	East/West/Southern African and Middle Eastern wholesale import tenders
Reflex Ultra White A4 Paper	165 CIE ultra-white shade; twin-wire formation uniformity	8,000 reams floor (19.96 MT net) / 7,800 pallet	Executive color laser presentations and Asia-Pacific commercial printers

How to Optimize 20GP Container Landed Cost and Multi-Brand Portfolio Margin?

Relying solely on a single tier-one brand leaves a wholesale distributor vulnerable to port price wars. High-margin importers structure their quarterly purchasing under ICC Incoterms 2020 rules and U.S. Department of Commerce trade guidelines using a three-tier portfolio strategy.

• Traffic-Driver Flagship Tier (25% Share): Stock globally recognized 80 gsm boxes (Double A, Rotatrim, or Xerox) to win government tenders and attract new B2B accounts at a fast-turnover 5% to 7% wholesale margin.
• Workhorse Commercial Tier (45% Share): Position high-bulk 75 gsm grades (such as JK Copier 75 gsm) for corporate accounts seeking a 5% to 8% invoice reduction without losing duplex runnability.
• High-Margin Mill-Direct OEM Tier (30% Share): Contract GUANHE to produce your private label 75 gsm and 80 gsm brand at a 3x20GP MOQ (24,000 reams) as detailed in our OEM private label A4 copy paper manufacturing checklist. We use virgin eucalyptus pulp (ISO 536:2019), BOPP wrappers, 5-ply ECT-44 boxes (ASTM D4169-22), and pallets bearing IPPC ISPM 15 heat-treatment marks.

Contact our export engineering desk on the direct proforma RFQ and contact page to request side-by-side sample reams, batch Mill Test Certificates (COA), and current FOB Qingdao or Shanghai 20GP container rates.

Frequently Asked Questions (FAQ)

Which A4 copy paper brand has the lowest jam rate in high-speed 100 ppm laser copiers?

Double A 80 gsm and Reflex Ultra White 80 gsm record the lowest jam rates in 90-to-100-page-per-minute production laser copiers. Their synchronized rotary cut accuracy (+/-0.2 mm under ISO 216:2007), high apparent bulk (1.36 to 1.38 cm3/g), and smooth Bendtsen surface (100 to 125 mL/min) prevent feed-roller slip and fuser curl.

How does JK Copier 75 gsm compare to standard 80 gsm A4 copy paper?

JK Copier 75 gsm uses high-bulk calendering (105 um caliper under ISO 534:2011, or 1.40 cm3/g bulk) so each sheet feels nearly as stiff as 106 um 80 gsm paper. Corporate buyers save 5% to 7% per ream (ISO 536:2019) while keeping 93% minimum opacity (ISO 2471:2008) for two-sided printing.

What is the difference between Xerox Performer and Xerox Premier A4 paper?

Xerox Performer is an everyday commercial office grade (158 to 160 CIE whiteness, 104 to 106 um caliper) built for high-volume monochrome laser copying and billing. Xerox Premier is a higher-whiteness executive grade (164 to 166 CIE whiteness, 108 to 110 um caliper) calibrated for duplex color laser presentations.

Can wholesalers mix two different A4 brands inside one 20GP container?

Yes, when port stock is available, buyers can split a 20GP container (8,000 reams floor-loaded) across two in-stock mill brands. For example, loading 4,000 reams of 80 gsm flagship stock and 4,000 reams of 75 gsm commercial stock lets dealers test local demand before ordering single-SKU containers.