{"product_id":"rotring-isograph-technical-pen-0-25-mm-refillable-iso-accurate-fine-line-drafting-pen","title":"Rotring Isograph technical pen 0.25 mm — refillable, ISO-accurate fine-line drafting pen","description":"\u003cp\u003e\u003cstrong\u003eRotring Isograph 0.25 mm is a refillable technical pen engineered for consistent, ISO-accurate fine lines in technical drawing and precise lettering.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Rotring Isograph pairs a metal, pressure-equalizing nib with a refillable ink reservoir to deliver repeatable 0.25 mm lines for architects, illustrators, and engineers. Designed for use with bottled black or coloured drawing inks, the Isograph is built to meet ISO 128 (drawing) and ISO 3098\/1 (lettering) standards while offering an easy-access cleaning system. Made in Germany, this pen is optimised for tracing paper, vellum, and lineboard where crisp, clog-free strokes matter.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the Isograph maintain a steady 0.25 mm line for technical work?\u003c\/h3\u003e\n\n\u003cp\u003eThe Isograph uses a fine metal nib with a controlled ink feed that stabilises flow across strokes and holds tolerance to ISO specifications. Its internal reservoir supplies a consistent ink stream that resists skipping during long lines or cross-hatching.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMetal nib engineered to hold exact line width under normal pressure.\u003c\/li\u003e\n  \u003cli\u003eRefillable reservoir reduces air gaps that cause interruptions.\u003c\/li\u003e\n  \u003cli\u003eSuitable for continuous strokes on tracing paper, vellum, and lineboard.\u003c\/li\u003e\n  \u003cli\u003eDelivers 0.25 mm lines compliant with ISO drawing and lettering standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes cleaning and maintenance easier than disposable pens?\u003c\/h3\u003e\n\n\u003cp\u003eThe Isograph’s push-on sleeve grants direct access to the ink helix so you can flush and clean the feed quickly without specialized tools. Because the pen is refillable, regular maintenance prevents build-up and keeps performance steady over time.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePush-on sleeve for fast access to feed and nib components.\u003c\/li\u003e\n  \u003cli\u003eRefillable design allows complete ink replacement and thorough flushing.\u003c\/li\u003e\n  \u003cli\u003eCompatible with a variety of bottled drawing inks for colour or black work.\u003c\/li\u003e\n  \u003cli\u003eReduces waste compared with single-use technical pens.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich media and inks are best paired with the 0.25 mm Isograph?\u003c\/h3\u003e\n\n\u003cp\u003eRotring recommends using high-quality drawing inks formulated for technical pens to avoid clogging and to preserve nib integrity. The pen performs best on smooth drafting surfaces such as tracing paper, vellum, and lineboard where fine, crisp lines are essential.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eUse archival-grade black or coloured bottled drawing inks (sold separately).\u003c\/li\u003e\n  \u003cli\u003eIdeal for tracing paper, vellum, and lineboard applications.\u003c\/li\u003e\n  \u003cli\u003eAvoid heavily textured papers that can accelerate nib wear or cause feathering.\u003c\/li\u003e\n  \u003cli\u003eRegular cleaning after colour changes prevents contamination between inks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the Isograph support professional drawing standards?\u003c\/h3\u003e\n\n\u003cp\u003eThe Isograph is manufactured to match ISO 128 and ISO 3098\/1 width requirements for drawing and lettering, making it a reliable choice for technical documents and presentations. Precision manufacturing and German craftsmanship help ensure durability and consistent line performance.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eLine widths conform to ISO standards for technical drawing and lettering.\u003c\/li\u003e\n  \u003cli\u003eDurable metal components minimize deformation under normal use.\u003c\/li\u003e\n  \u003cli\u003eRefillable system promotes long-term consistency and cost efficiency.\u003c\/li\u003e\n  \u003cli\u003eProduced in Germany to maintain quality control and reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Rotring Isograph 0.25 mm is intended for drafters, architects, technical illustrators, and students who need precise, repeatable line work and prefer a refillable instrument. It suits anyone working on tracing paper, vellum, or lineboard who wants ISO-compliant lines and straightforward maintenance. If you require a reliable fine-line pen that accepts bottled inks and offers easy access for cleaning, the Isograph is designed to meet those needs without the consumable waste of disposable pens.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use any bottled ink in the Rotring Isograph?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use drawing inks formulated for technical pens; avoid pigmented or particulate inks that can clog the fine 0.25 mm feed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I clean the Isograph?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Clean after every ink change and perform a quick flush after heavy use to prevent build-up and maintain consistent flow.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Rotring","offers":[{"title":"Default Title","offer_id":55294434509137,"sku":"B00JXIRC92","price":44.51,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/rotring-isograph-front-view_99f7f7ca-dc31-4681-9224-137e671edef2.jpg?v=1791930113","url":"https:\/\/craftiche.co.uk\/products\/rotring-isograph-technical-pen-0-25-mm-refillable-iso-accurate-fine-line-drafting-pen","provider":"Craftiche","version":"1.0","type":"link"}