Rubber Seal & O-Ring Glossary
23 industry terms covering materials (NBR, FKM Viton, EPDM, Silicone), standards (AS568, JIS B2401, ISO 3601), components, and testing — quick reference for engineers, procurement, and QA/QC teams.
Materials / Vật liệu (6)
- NBR (Nitrile Butadiene Rubber)cao su nitrile
NBR (Nitrile Butadiene Rubber) is the most widely used O-ring and gasket elastomer, offering excellent resistance to petroleum oils, fuels, …
- FKM / Viton (Fluorocarbon Elastomer)cao su fluoro FKM Viton
FKM (fluorocarbon elastomer, trade name Viton) is a high-performance O-ring material with 66–70% fluorine content, resisting oils, fuels, an…
- EPDM (Ethylene Propylene Diene Monomer)cao su EPDM
EPDM is a synthetic rubber with outstanding resistance to water, steam, ozone, and UV, operating from –50°C to +150°C — ideal for water syst…
- VMQ Silicone (Polydimethylsiloxane Rubber)cao su silicone VMQ
VMQ Silicone (polydimethylsiloxane) is a flexible, FDA-compliant elastomer operating from –60°C to +200°C with excellent electrical insulati…
- PTFE-Encapsulated O-RingO-ring bọc PTFE
A PTFE-encapsulated O-ring has a thin PTFE or FEP outer shell (0.2–0.5 mm) over a silicone or FKM core — combining universal chemical resist…
- CR Neoprene (Polychloroprene Rubber)cao su neoprene CR
CR Neoprene is a synthetic rubber with good weathering, ozone, and flame resistance, operating –40°C to +120°C — used for HVAC duct gaskets,…
Standards / Tiêu chuẩn (4)
- AS568 O-Ring Standard (SAE/ANSI)
AS568 (SAE Aerospace Standard) defines 369 standard O-ring sizes in inch dimensions — each identified by a dash number (e.g. -214) specifyin…
- JIS B2401 (Japanese O-Ring Standard)
JIS B2401 is the Japanese Industrial Standard for O-rings, defining P-series (piston/bore), G-series (groove face), S-series (straight pipe)…
- JIS B2220 (Steel Pipe Flanges — Japanese Standard)
JIS B2220 defines Japanese steel pipe flanges in pressure classes 5K, 10K, 16K, 20K, 30K, 40K, and 63K (kgf/cm²) — prevalent in Japanese-ori…
- ISO 3601 O-Ring Standard
ISO 3601 is the international metric O-ring standard defining dimensions (Part 1), groove design (Part 2), quality acceptance criteria (Part…
Units & Measurements / Đơn vị đo (3)
- Shore A Hardness (Durometer)
Shore A hardness (durometer) measures rubber stiffness on a 0–100 scale — standard O-ring compound is 70 Shore A; softer grades (40–60) seal…
- Compression Set
Compression set (CS%) measures how much of an O-ring's original thickness is permanently lost after sustained compression — low compression …
- PN (Pressure Nominal)cấp áp suất danh nghĩa PN
PN (Pressure Nominal, áp suất danh nghĩa) là cấp áp suất tham chiếu của mặt bích và gioăng theo DIN/EN/ISO — biểu thị bằng bar ở nhiệt độ ch…
Components / Cấu kiện (6)
- O-Ring Groove / Gland Design
O-ring groove (gland) design specifies groove depth, width, and surface finish to achieve 15–25% diametral squeeze and 6–15% free volume — e…
- Dynamic vs Static Seal
A static seal prevents leakage between non-moving surfaces (flange faces, port plugs); a dynamic seal operates with relative motion between …
- Oil Seal TC / TB (Lip Seal)phớt dầu TC/TB
TC and TB oil seals are double-lip and single-lip rotary shaft seals with a spring-loaded PTFE or rubber primary lip — standardised in metri…
- Garter Spring
A garter spring is a small coiled-wire spring formed into a closed loop that loads the primary lip of an oil seal (TC/TB type) against the r…
- X-Ring / Quad Ring
An X-ring (Quad Ring) has a four-lobed cross-section instead of a circular one — providing two sealing contacts per side, lower friction in …
- V-Ring Seal
A V-ring is a one-piece axial shaft seal with a V-shaped cross-section that mounts on the shaft (not the housing) and deflects a flexible li…
Process & Testing / Quy trình (2)
- Compression Set Test (ASTM D395 / ISO 815)
The compression set test (ASTM D395B / ISO 815) compresses a rubber disc to 25% deflection, holds it at elevated temperature for 70 hours, t…
- O-Ring Installation Best Practices
Correct O-ring installation — lubricating, inspecting, and fitting without twisting or nicking — prevents up to 60% of O-ring field failures…
Industry Applications / Ngành ứng dụng (2)
- Hydraulic Sealing Systemhệ thống làm kín thủy lực
A hydraulic sealing system comprises piston seals, rod seals, wiper seals, guide rings, and O-ring static seals working together to contain …
- Food & Pharma Seal Compliance (FDA / USP Class VI)gioăng cấp thực phẩm / dược phẩm
Food and pharmaceutical seals must meet FDA 21 CFR 177 (materials in contact with food) and/or USP Class VI (biological testing) — requiring…