diff --git a/app/Http/Controllers/ProductController.php b/app/Http/Controllers/ProductController.php
index bd0a444..16d702a 100755
--- a/app/Http/Controllers/ProductController.php
+++ b/app/Http/Controllers/ProductController.php
@@ -100,8 +100,17 @@ class ProductController extends Controller
             }
         }
 
+        // F-08: Füllgewicht deutsch normalisieren („39,5“) und positiv validieren.
+        if (Request::has('fill_weight')) {
+            $fillRaw = trim((string) Request::input('fill_weight'));
+            $fillNormalized = $fillRaw === '' ? null : reFormatWawiNumber($fillRaw);
+            // Unbrauchbare Eingabe („abc“) nicht zu leer normalisieren, sonst greift nullable.
+            Request::merge(['fill_weight' => $fillNormalized === '' || $fillNormalized === false ? $fillRaw : $fillNormalized]);
+        }
+
         $rules = [
             'name' => 'required',
+            'fill_weight' => ['nullable', 'numeric', 'gt:0'],
         ];
         /*if(isset($data['number']) && $data['number'] != ""){
             $rules['number'] = 'int';
diff --git a/app/Models/Product.php b/app/Models/Product.php
index 8539976..39e7365 100644
--- a/app/Models/Product.php
+++ b/app/Models/Product.php
@@ -194,7 +194,7 @@ class Product extends Model
         'show_on' => 'array',
         'action' => 'array',
         'wp_number' => 'int',
-        'fill_weight' => 'int',
+        'fill_weight' => 'float',
         'production_relevant' => 'bool',
         'single_commission' => 'bool',
         'amount_commission' => 'bool',
diff --git a/database/migrations/2026_09_08_120000_change_fill_weight_to_decimal_on_products_table.php b/database/migrations/2026_09_08_120000_change_fill_weight_to_decimal_on_products_table.php
new file mode 100644
index 0000000..a9406d8
--- /dev/null
+++ b/database/migrations/2026_09_08_120000_change_fill_weight_to_decimal_on_products_table.php
@@ -0,0 +1,26 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Prüfung 08.09.2026 F-08: Füllgewicht mit Nachkommastellen (z. B. 50 ml × 0,79 = 39,5 g).
+ * Als Integer wurde 39,5 zu 39 und die gesamte Rezepturskalierung wich ab.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->decimal('fill_weight', 10, 3)->nullable()->change();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->integer('fill_weight')->nullable()->change();
+        });
+    }
+};
diff --git a/resources/views/admin/product/form.blade.php b/resources/views/admin/product/form.blade.php
index 4c7d30b..4edf9ef 100755
--- a/resources/views/admin/product/form.blade.php
+++ b/resources/views/admin/product/form.blade.php
@@ -532,7 +532,10 @@
             </div>
             <div class="form-group col-sm-3">
                 <label class="form-label" for="fill_weight">{{ __('Füllgewicht (g) – für Produktion') }}</label>
-                {{ Form::text('fill_weight', $product->fill_weight, ['placeholder' => __('leer = Menge = Gramm (1 g/ml)'), 'class' => 'form-control', 'id' => 'fill_weight']) }}
+                {{ Form::text('fill_weight', $product->fill_weight !== null ? rtrim(rtrim(number_format((float) $product->fill_weight, 3, ',', '.'), '0'), ',') : null, ['placeholder' => __('leer = Menge = Gramm (1 g/ml)'), 'class' => 'form-control'.($errors->has('fill_weight') ? ' is-invalid' : ''), 'id' => 'fill_weight', 'inputmode' => 'decimal']) }}
+                @error('fill_weight')
+                <div class="invalid-feedback">{{ $message }}</div>
+                @enderror
                 <small class="form-text text-muted">{{ __('Basis für die Rezeptur-Mengenberechnung (Prozent × Füllgewicht).') }}</small>
             </div>
             <div class="form-group col-sm-2">
diff --git a/tests/Feature/ProductFillWeightTest.php b/tests/Feature/ProductFillWeightTest.php
new file mode 100644
index 0000000..af09031
--- /dev/null
+++ b/tests/Feature/ProductFillWeightTest.php
@@ -0,0 +1,74 @@
+<?php
+
+use App\Models\Location;
+use App\Models\PackagingItem;
+use App\Models\PackagingMaterial;
+use App\Models\Product;
+use App\Models\Supplier;
+use App\Services\ProductionService;
+use App\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+uses(TestCase::class, RefreshDatabase::class);
+
+/**
+ * Prüfung 08.09.2026 F-08: Füllgewicht mit Nachkommastellen (Dezimalspalte, deutsche Eingabe, Validierung).
+ */
+function fwUser(): User
+{
+    $user = User::query()->create(['email' => uniqid('fw_', true).'@test.example', 'password' => bcrypt('password')]);
+    $user->forceFill(['admin' => 7, 'confirmed' => true, 'active' => true, 'wizard' => 100, 'blocked' => false])->save();
+
+    return $user->fresh();
+}
+
+test('F-08: füllgewicht 39,5 wird mit nachkommastellen gespeichert und skaliert die rezeptur exakt', function () {
+    $this->actingAs(fwUser(), 'user');
+
+    $this->post(route('admin_product_store'), ['id' => 'new', 'name' => 'FW-Dezimal', 'fill_weight' => '39,5'])
+        ->assertRedirect()->assertSessionHasNoErrors();
+
+    $product = Product::query()->where('name', 'FW-Dezimal')->firstOrFail();
+    expect($product->fill_weight)->toBe(39.5)
+        ->and(app(ProductionService::class)->recipeGramScale($product))->toBe(0.395);
+
+    // Punkt mit 1–2 Nachkommastellen gilt als Dezimaltrenner (WaWi-Konvention), leer = null.
+    $this->post(route('admin_product_store'), ['id' => $product->id, 'name' => 'FW-Dezimal', 'fill_weight' => '4.5'])->assertSessionHasNoErrors();
+    expect($product->fresh()->fill_weight)->toBe(4.5);
+
+    $this->post(route('admin_product_store'), ['id' => $product->id, 'name' => 'FW-Dezimal', 'fill_weight' => ''])->assertSessionHasNoErrors();
+    expect($product->fresh()->fill_weight)->toBeNull();
+});
+
+test('F-08: ungültiges oder negatives füllgewicht wird abgelehnt', function () {
+    $this->actingAs(fwUser(), 'user');
+    $product = Product::query()->create(['name' => 'FW-Invalid', 'title' => 'x', 'active' => true, 'fill_weight' => 10]);
+
+    // Der Produkt-Controller rendert bei Fehlern das Formular direkt (kein Redirect).
+    foreach (['abc', '-5', '0'] as $bad) {
+        $this->post(route('admin_product_store'), ['id' => $product->id, 'name' => 'FW-Invalid', 'fill_weight' => $bad])
+            ->assertOk()
+            ->assertSee('is-invalid', false);
+    }
+    expect($product->fresh()->fill_weight)->toBe(10.0);
+});
+
+test('F-07: produktionsformular liefert die verpackungs-stückliste je ergebnisprodukt für die vorschau', function () {
+    $this->actingAs(fwUser(), 'user');
+    $supplier = Supplier::factory()->create();
+    $material = PackagingMaterial::factory()->create();
+    $pk = PackagingItem::factory()->create(['packaging_material_id' => $material->id, 'supplier_id' => $supplier->id, 'name' => 'F07-Tiegel', 'category' => 'packaging']);
+    $small = Product::query()->create(['name' => 'F07-5ml', 'title' => 'x', 'active' => true, 'no_recipe_required' => true, 'production_relevant' => false]);
+    $small->packagings()->sync([$pk->id => ['quantity' => 2, 'pos' => 0]]);
+    Location::factory()->create();
+
+    $html = $this->get(route('admin.inventory.productions.create'))->assertOk()->getContent();
+    $start = strpos($html, "data-packaging-bom='") + strlen("data-packaging-bom='");
+    $bom = json_decode(substr($html, $start, strpos($html, "'", $start) - $start), true);
+
+    expect($bom)->toHaveKey((string) $small->id)
+        ->and($bom[$small->id][0]['name'])->toBe('F07-Tiegel')
+        ->and($bom[$small->id][0]['per_unit'])->toEqual(2)
+        ->and($html)->toContain('renderPackagingPreview');
+});