T45 vs T55 vs T65: Which French Flour for Which Application — Complete Guide for Professional Bakers

The T-number on French flour tells you one thing: how much of the wheat grain was retained after milling, expressed as ash content. Lower T = more refined, softer, more extensible. Higher T = more minerals, more fermentation character, more structure. Choosing the wrong T-number for your application is the most common reason authentic French recipes underperform in Canadian bakeries. This guide gives you the direct answer for every application.

The quick answer: T45 vs T55 vs T65 at a glance

Flour	Ash content	Protein	Best for	Price from (CAD)
Bagatelle T45	0.40–0.45%	~8.5%	Croissants, brioche, panettone, viennoiserie	$12.50 / 1 kg
Terroir T55 Pâtisserie	0.50–0.60%	12.5% (W330)	High-performance viennoiserie, enriched doughs, fine pastry	$12.50 / 1 kg
Terroir Feuilletage T55	0.50–0.60%	n/a	Puff pastry, mille-feuille, laminated specialist	$175 / 25 kg
Bagatelle T65	0.62–0.75%	11.3% (W200)	Baguettes, levain, sourdough, artisan bread	$12.50 / 1 kg
Terroir T130 Rye	~1.30%	12–14%	Rye bread, sourdough starters, multigrain	$180 / 25 kg

What the T-number actually measures

French flour classification is based on ash content — the mineral residue left after incinerating 5g of flour at 900°C per standard NF V03-720. The T-number represents grams of ash per kilogram of flour. T45 leaves 0.40–0.45g. T65 leaves 0.62–0.75g. T130 rye leaves approximately 1.30g.

This is fundamentally different from Canadian flour classification, which uses protein content. Higher ash content in French flour means more of the wheat's outer bran layers are retained — more minerals, more fermentation activity, more complex flavor in the finished product. Lower ash means finer, more delicate, more extensible flour.

The two Foricher lines: Bagatelle and Terroir

All Foricher flours carry CRC® certification (Contrôle Responsable de Céréales) — full traceability from wheat variety to mill. No additives, no enzymes, no GMOs. The Bagatelle line follows Tradition Française specifications (additive-free, Label Rouge certified in France). The Terroir line offers higher technical precision with tighter tolerances and higher W strength. Note: Canadian food regulations require mandatory flour enrichment — what you receive is vitaminée (enriched) Foricher flour, identical in wheat, milling, and specs to the French version.

1. T45 Bagatelle — Best flour for croissants and viennoiserie

Ash: 0.40–0.45% · Protein: ~8.5% · From $12.50 / 1 kg · Available in 1 kg, 10 × 1 kg, 25 kg

T45 is the specialist flour for laminated doughs and enriched pastry. Its low ash content and low protein (8.5%) give it exceptional extensibility — the dough relaxes and stretches without springing back, which is exactly what you need when sheeting croissant dough through multiple folds without tearing.

For brioche and panettone, T45's fine particle size integrates butter evenly and supports the high-fat, high-egg formulations that would tighten in a higher-protein flour. The result is a more open, airy crumb with a pale, delicate color.

• Croissants and pain au chocolat
• Brioche (all formats)
• Panettone and pandoro
• Choux pastry
• Fine cakes and tarts requiring tender crumb
• Any enriched dough where butter integration is critical

View Bagatelle T45 → from $12.50 CAD

2. Terroir T55 Pâtisserie — Best flour for high-performance viennoiserie at production scale

Ash: 0.50–0.60% · Protein: 12.5% · W330 · P/L: 0.6 · From $12.50 / 1 kg · Available in 1 kg, 10 × 1 kg, 25 kg

The Terroir T55 Pâtisserie is built for precision and production volume. W330 is on the strong end for a T55 — this flour handles the mechanical stress of sheeting and folding without tearing, making it the right choice for croissants, kouign-amann, and Danish at scale where T45's lower protein may not handle high-volume sheeting equipment as reliably. P/L ratio of 0.6 means balanced extensibility and elasticity.

For professional bakeries running the same formulas daily, the Terroir line's tight tolerances (consistent protein, ash, and alveograph parameters batch to batch) reduce recipe adjustment and waste in a way that the Bagatelle line, with its more artisanal spec, cannot always guarantee.

• High-volume croissant and viennoiserie production
• Kouign-amann, Danish, enriched laminated doughs
• Fine pastry requiring consistent W strength
• Bakeries running automated sheeting equipment

View Terroir T55 Pâtisserie → from $12.50 CAD

3. Terroir Feuilletage T55 — Best flour for puff pastry

Ash: 0.50–0.60% · 25 kg only · $175 CAD

The Terroir Feuilletage T55 is a specialist puff pastry flour — formulated specifically for clean layer separation in mille-feuille, vol-au-vent, and puff pastry applications. Different extensibility spec from the T55 Pâtisserie, optimized for the specific mechanical demands of puff pastry production where the dough must hold hundreds of distinct fat layers without merging during baking.

Available in 25 kg format only — designed for bakeries running puff pastry in volume. If you produce both viennoiserie and puff pastry, this and the T55 Pâtisserie serve different product lines.

• Mille-feuille, vol-au-vent, puff pastry shells
• Pithivier, tarte Tatin base
• Any application where clean puff pastry layers are the technical goal

View Terroir Feuilletage T55 → $175 CAD / 25 kg

4. Bagatelle T65 — Best flour for baguettes and artisan bread

Ash: 0.62–0.75% · Protein: 11.3% · W200 · P/L: 0.7 · From $12.50 / 1 kg · Available in 1 kg, 10 × 1 kg, 25 kg

T65 is the standard bread flour in France — the classification for baguette de tradition, pain de campagne, levain loaves, and most artisan bread production. The Bagatelle T65 follows Tradition Française specifications: no additives, no ascorbic acid. W200, P/L 0.7 ± 0.2 — moderate strength, balanced extensibility, built for long cold fermentation.

The absence of additives means the dough is more sensitive to over-fermentation than additive-enhanced flours — but more rewarding when handled correctly. Long cold retard (10–16 hours at 4–6°C) develops the flavor that distinguishes a proper baguette tradition from a generic bread-flour loaf.

• Baguette de tradition (the primary application)
• Pain de campagne, levain loaves
• Long-ferment sourdough
• Artisan bread where crust character and open crumb matter

View Bagatelle T65 → from $12.50 CAD

5. Terroir T130 Rye — Best rye flour for sourdough and multigrain

Ash: ~1.30% · CRC® certified French rye · 25 kg · $180 CAD

The Terroir T130 is a whole rye flour — the full rye grain with high bran and mineral content. CRC® certified French rye, milled to the same traceability standards as the Terroir wheat flours. Used in traditional rye bread production, as a fermentation booster in sourdough starters (the high ash content feeds wild yeast vigorously), and in multigrain blends where dense, aromatic character is the goal.

T130 rye behaves fundamentally differently from wheat flour — it has no gluten network (rye proteins do not form gluten in the same way). Rye doughs are stickier, denser, and require different hydration and shaping techniques. Start with a 20–30% rye blend if you are new to rye baking.

• Traditional rye bread (pain de seigle)
• Sourdough starter inoculation and maintenance
• Multigrain blends (20–30% rye addition)
• Dark, dense loaves with full mineral character

View Terroir T130 Rye → $180 CAD / 25 kg

Which flour for which application

Application	Recommended flour	Why
Croissants, pain au chocolat	Bagatelle T45 (artisan) or Terroir T55 (production)	T45 for delicate layers, T55 Terroir for high-volume sheeting
Brioche	Bagatelle T45	Low protein integrates butter without toughness
Panettone, pandoro	Bagatelle T45	High-fat formulation needs extensible, low-protein structure
Kouign-amann, Danish	Terroir T55 Pâtisserie	W330 handles mechanical stress of multiple folds
Puff pastry, mille-feuille	Terroir Feuilletage T55	Specialist lamination spec, clean layer separation
Baguette de tradition	Bagatelle T65	No additives, authentic crust and crumb character
Sourdough, levain	Bagatelle T65	Higher ash supports fermentation activity
Rye bread	Terroir T130	CRC® certified whole rye, aromatic and mineral
Sourdough starter	Terroir T130 (blend with T65)	High ash feeds wild yeast vigorously

Pricing summary

Flour	1 kg	10 × 1 kg	25 kg
Bagatelle T45	$12.50	$95	$175
Terroir T55 Pâtisserie	$12.50	$95	$175
Terroir Feuilletage T55	—	—	$175
Bagatelle T65	$12.50	$95	$170
Terroir T130 Rye	—	—	$180

Frequently asked questions

Can I substitute T55 for T45 in croissant recipes?

Yes, but the result will differ. T55 has more protein than T45, which means the dough will be less extensible and may spring back more during sheeting. For small batches, the Bagatelle T45 will produce more delicate, tender layers. The Terroir T55 Pâtisserie (W330) works better for production-scale croissants where its strength handles automated sheeting without tearing.

What is the difference between Bagatelle and Terroir in the T55 range?

Bagatelle T55 follows Tradition Française specs — additive-free, Label Rouge certified in France, slightly more variable batch to batch. Terroir T55 Pâtisserie has a higher W strength (W330 vs W200 for standard T55), tighter tolerances, and is built for professional production consistency. For high-volume bakeries running the same formula daily, the Terroir line is the more reliable choice.

Where can I buy Foricher French flour in Canada?

Zucchero Canada (zuccherocanada.ca) is the authorized Canadian distributor for Foricher Les Moulins. Stocked in Calgary, shipping across Canada. Available in 1 kg (recipe development), 10 × 1 kg, and 25 kg (production) formats. Contact sales@zuccherocanada.ca for standing orders and volume pricing.

Why does my croissant recipe not work with Canadian all-purpose flour?

Canadian all-purpose is milled from hard red spring wheat (12–13% protein), which is significantly stronger than French T45 (8.5% protein) or T55 (11–12.5%). The higher gluten strength resists the extensibility needed for lamination — dough springs back during sheeting, layers merge, and the honeycomb crumb structure typical of a proper croissant does not develop. French flour's soft wheat base and ash classification system produce a fundamentally different baking behavior.

All Foricher flours are stocked in Calgary and ship across Canada. Priority allocation for bakeries and food service operations on standing orders. Contact our team for volume pricing.

Bagatelle T45  |  Terroir T55  |  Terroir Feuilletage  |  Bagatelle T65  |  Terroir T130 Rye  |  Full Foricher collection