Ý nghĩa của ký hiệu trên cây bút chì HB, 2B, 3B

Bút chì thì quá quen thuộc với chúng ta nhưng có bao giờ bạn tò mò ký hiệu trên cây bút chì HB, 2B, 3B có ý nghĩa là gì?

Ký hiệu trên cây bút chì chỉ độ cứng hay độ đậm nhạt của ruột chì. Tuy nhiên kho ý tưởng sẽ cung cấp cho bạn một chút kiến thức lý thú về cây bút chì

Ruột cây bút chì được làm từ 2 thành phần chính là than chì (Carbon) và đất sét Clay. Người ta sẽ pha phần trăm lượng đất sét và than để tạo ra lõi bút chì. Tùy theo tỉ lệ mà ruột chì có độ cứng khác nhau.

Phần trăm đất sét càng cao thì độ cứng càng cao, độ nét càng cao HB, 2HB, 3HB…Ngược lại nếu phần trăm than chì càng cao thì bút chì càng đậm và mềm 2B, 3B,…5B, 6B… Bạn thấy những cây bút chì kẻ mắt thưởng có ký hiệu từ 6B trở lên

phan-biet-ky-hieu-tren-but-chi-min

Đó là 2 thành phần chính. Ngoài ra các hãng khác nhau họ sẽ thêm phụ gia riêng. VD hãng bút chì Faber castel thì họ sẽ tăng độ bóng của chì giúp cho các bản vẽ nhìn long lanh. Sản phẩm hãng nhắm đến là dụng cụ vẽ dành cho dân chuyên nghiệp.

phan-biet-ky-hieu-tren-but-chi-min

Hãng bút chì Artline Japan thì họ thêm phụ gia chống gãy ruột chì và giảm độ bóng. Vì bút chì 2B Artline nhắm đến học sinh và các kỳ thi trắc ghiệm. Nên ít độ bóng giúp nét đậm hơn, dễ đọc hơn và máy chấm thi trắc nghiệm chính xác hơn.

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Trong bài này mình chỉ đề cập đến ruột bút chì. Vì bạn có thể tìm thấy bút chì gỗ, bút chì bấm… nhiều hình thái khác nhau. Nhưng ký hiệu HB, 2B, 3B chỉ định đến ruột chì

Bạn tham khảo thêm các kiến thức khoa học hữu ích khác và đừng quên chia sẽ cho bạn bè.

Nguồn tham khảo : Most creative Ideas

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