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UHP Welded Pipe Products

Ultra High-Purity (UHP) Pipe Products for

Semiconductors and LCD Display Devices

CREST HPW is precision-engineered and manufactured as welded-as-seam-less (WSL) according to ASTM A269/A270 and/or JIS G3459 with the specific purpose of servicing ultra high-purity applications and vacuum components for semiconductor and related industries such as LCD, LED, OLED, poly-silicon and solar cells.  For process piping projects, scheduled pipes up to 16-inches or equivalently 406.4 mm OD are offered in SF1 MP or SF4 EP finishes.

Ultra-High Purity Products

Dimension
OD [inch/mm] WT [inch/mm]
1/4″(6.35) 0.035″(0.89)
3/8″(9.53) 0.035″(0.89)
1/2″(12.7) 0.049″(1.24)
3/4″(19.05) 0.065″(1.65)
1″(25.4) 0.065″(1.65)
1.5″(38.1) 0.065″(1.65)
2″(50.8) 0.065″(1.65)
2.5″(63.5) 0.065″(1.65)
3″(76.2) 0.065″(1.65)
4″(101.6) 0.083″(2.11)
6″(152.4) 0.109″(2.77)
40A (48.6) 1.65
50A (60.5) 1.65
65A (72.3) 2.10
80A (89.1) 2.10
100A (114.3) 2.10
150A (165.2) 2.80
200A (216.3) 2.80
250A (267.4) 3.40
300A (318.5) 4.00
400A (406.4) 4.50
Code (Finish) Specifications Pre-Materials Surface Finish (max)
SF0
BA
A269/A270 304L
316L
ID < 40 RA < 1.0 μm
OD < 40 RA < 1.0 μm
SF0
BAP
A269/A270 304L
316L
ID < 40 RA < 1.0 μm
OD < 32 RA < 0.8 μm
SF1
MP
A269/A270 304L
316L
ID < 15 RA < 0.4 μm
OD < 32 RA < 0.8 μm
SF4
EP
A269/A270 304L
316L
ID < 10 RA < 0.25 μm
OD < 32 RA < 0.8 μm

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