Grades of pure titanium and their applications in eyeglass frames
I. Main grades and characteristics of pure titanium
Pure titanium refers to materials with a titanium content of ≥99%. According to the purity and performance differences, the common grades are as follows:
1. ASTM Grade 1 (TA1)
Purity: The titanium content is about 99.5%, and the impurity content (iron, oxygen, etc.) is extremely low.
Performance:
The density is only 4.5g/cm³, which is the lightest grade of pure titanium. It has excellent ductility (can be cold processed into extremely thin plates), but the strength is relatively low.
It has excellent corrosion resistance, especially strong resistance to daily corrosive media such as sweat and cosmetics.
Application parts:
Tempers: Using its flexibility, it can fit the ears naturally when worn to reduce the sense of pressure.
Nose bridge parts: such as nose bridge brackets or nose bridge connectors of frameless glasses, which are not easy to break when they need to be adjusted frequently.
Ultra-thin frames: pursue the ultimate lightweight design (such as frame frames with a thickness of less than 1mm).
2. ASTM Grade 2 (TA2)
Purity: Titanium content is about 99.2%, and the impurity content is slightly higher than Grade 1.
Performance:
Strength is about 10%-15% higher than Grade 1 (tensile strength ≥345MPa), while maintaining good processability and corrosion resistance (better than stainless steel).
Better high temperature resistance (can withstand temperatures below 300℃), suitable for surface treatment (such as anodizing coloring).
Application:
Frame body: such as the front frame of full-frame glasses and the metal frame beam of half-frame glasses, which need to take into account both strength and lightness.
Template body: More suitable for making medium and long temples than Grade 1 to avoid deformation due to excessive softness.
High-end pure titanium frame: Japanese brands (such as Kaneko and Masunaga) often use TA2 for pure titanium glasses, which have a delicate texture and outstanding durability.
II. The core advantages of pure titanium in glasses
Lightweight and comfort: The density of pure titanium is only 1/2 of that of steel. It does not feel oppressive when worn for a long time. It is suitable for users with high myopia or weight sensitivity.
Biological compatibility: Almost no metal ion release, less irritation to the skin, suitable for people with allergies.
Corrosion resistance: It is not easy to rust or discolor after long-term contact with sweat and skin care products, which extends the service life of the frame.
Design flexibility: It can be made into ultra-thin, hollow and other complex shapes through cold processing, suitable for minimalist or artistic design (such as Lindberg's pure titanium screwless frame).
III. The logic of choosing different grades of pure titanium
Pursue extreme lightness: Choose Grade 1 (TA1), suitable for non-load-bearing parts such as temples and nose bridges.
Taking into account both strength and texture: Choose Grade 2 (TA2), suitable for parts that need to support lenses such as the frame body and full frame structure.
Surface treatment requirements: Grade 2 has higher strength and better color stability after anodizing than Grade 1, suitable for color frame design.
Example scenario: In a pair of pure titanium frameless glasses, the nose bridge connection may use Grade 1 (flexible and easy to adjust), while the metal studs that fix the lenses are Grade 2 (strong enough to support the weight of the lenses).
Grades of pure titanium and their applications in eyeglass frames
I. Main grades and characteristics of pure titanium
Pure titanium refers to materials with a titanium content of ≥99%. According to the purity and performance differences, the common grades are as follows:
1. ASTM Grade 1 (TA1)
Purity: The titanium content is about 99.5%, and the impurity content (iron, oxygen, etc.) is extremely low.
Performance:
The density is only 4.5g/cm³, which is the lightest grade of pure titanium. It has excellent ductility (can be cold processed into extremely thin plates), but the strength is relatively low.
It has excellent corrosion resistance, especially strong resistance to daily corrosive media such as sweat and cosmetics.
Application parts:
Tempers: Using its flexibility, it can fit the ears naturally when worn to reduce the sense of pressure.
Nose bridge parts: such as nose bridge brackets or nose bridge connectors of frameless glasses, which are not easy to break when they need to be adjusted frequently.
Ultra-thin frames: pursue the ultimate lightweight design (such as frame frames with a thickness of less than 1mm).
2. ASTM Grade 2 (TA2)
Purity: Titanium content is about 99.2%, and the impurity content is slightly higher than Grade 1.
Performance:
Strength is about 10%-15% higher than Grade 1 (tensile strength ≥345MPa), while maintaining good processability and corrosion resistance (better than stainless steel).
Better high temperature resistance (can withstand temperatures below 300℃), suitable for surface treatment (such as anodizing coloring).
Application:
Frame body: such as the front frame of full-frame glasses and the metal frame beam of half-frame glasses, which need to take into account both strength and lightness.
Template body: More suitable for making medium and long temples than Grade 1 to avoid deformation due to excessive softness.
High-end pure titanium frame: Japanese brands (such as Kaneko and Masunaga) often use TA2 for pure titanium glasses, which have a delicate texture and outstanding durability.
II. The core advantages of pure titanium in glasses
Lightweight and comfort: The density of pure titanium is only 1/2 of that of steel. It does not feel oppressive when worn for a long time. It is suitable for users with high myopia or weight sensitivity.
Biological compatibility: Almost no metal ion release, less irritation to the skin, suitable for people with allergies.
Corrosion resistance: It is not easy to rust or discolor after long-term contact with sweat and skin care products, which extends the service life of the frame.
Design flexibility: It can be made into ultra-thin, hollow and other complex shapes through cold processing, suitable for minimalist or artistic design (such as Lindberg's pure titanium screwless frame).
III. The logic of choosing different grades of pure titanium
Pursue extreme lightness: Choose Grade 1 (TA1), suitable for non-load-bearing parts such as temples and nose bridges.
Taking into account both strength and texture: Choose Grade 2 (TA2), suitable for parts that need to support lenses such as the frame body and full frame structure.
Surface treatment requirements: Grade 2 has higher strength and better color stability after anodizing than Grade 1, suitable for color frame design.
Example scenario: In a pair of pure titanium frameless glasses, the nose bridge connection may use Grade 1 (flexible and easy to adjust), while the metal studs that fix the lenses are Grade 2 (strong enough to support the weight of the lenses).
