Product Introduction

Core Product Advantages

1. High-Precision Polished Stainless Steel Structure

   All pressing plates, guide posts, fastening bolts and limit sleeves are made of SUS304 stainless steel with mirror precision grinding. Plate flatness tolerance ≤0.02mm, surface roughness extremely low to guarantee uniform compression on every sample. The stainless construction resists rust and oxidation after long cycles inside high-temperature ovens without contaminating test pieces.

   2.Multiple Limit Spacers for Full Hardness Matching

   Equipped with interchangeable limit sleeves of 7.62mm / 8.89mm / 9.52mm / 10.16mm to realize 20%, 30%, 40% compression ratios matching different rubber hardness grades:

• Shore A hardness below 50: apply 40% compression
• Shore A 50~75: adopt 30% compression
• Shore A above 75: select 20% compressionCovers all mainstream rubber and foam testing requirements.

   

  3.Dual Specimen Size Compatibility

  Supports two standard specimen types specified in global testing standards:

   

  4.Solid vulcanized rubber: Φ28.68 × 12.7mm cylindrical samples

   

  5.Foam elastomer: 50 × 50 × 25mm square blanks

  One fixture completes both rubber and foam compression set tests without extra accessories.

   

  6.Stable Locking Structure Without Thermal Loosening

  Four sets of high-strength thread bolts with lock nuts firmly fix the parallel plates. Even after dozens of hours of high-temperature aging, the clamping distance stays unchanged, eliminating test error caused by loose plates. Simple assembly without special tools for fast specimen replacement.

   

  7.Compact Desktop Size & Lightweight Design

  Overall dimension only 200 × 120 × 100mm with total weight 10kg, easy to carry and place inside standard blast drying ovens. No power or air source required, fully manual operation suitable for all laboratory environments.

Standard Complete Test Workflow

1. Specimen ConditioningCut raw materials into standard test blanks, store them under 23℃ constant lab environment for at least 3 hours to eliminate internal stress, then measure original thickness H₀ accurately with thickness gauge.
2. Specimen ClampingSelect matched limit sleeves based on target compression rate, place samples evenly between upper and lower steel plates, tighten all bolts uniformly to lock the fixture tightly.
3. High-Temperature AgingPut the fully assembled fixture into blast drying oven, set specified test temperature and aging duration (24h / 72h / 168h as standard). Keep oven internal temperature fluctuation within ±1℃ to meet standard requirements.
4. Cooling & Rebound MeasurementTake the fixture out after aging cycle, release bolts and take out specimens. Place samples on heat-insulating flat board and recover freely for 30 minutes under standard environment, then measure recovered thickness H₂ precisely.
5. Compression Set CalculationCalculate compression set rate via standard formula:

   K = [(H₀ – H₂) ÷ (H₀ – H₁)] × 100%

   H₁ = Height of limit spacer

   Take arithmetic average of at least 3 parallel samples as final test result; discard data if specimens crack after compression.

   Data deviation rules:

• If compression set value ＜10%: allow absolute deviation ±1%
• If compression set value ＞10%: allow relative deviation ±10%

Applicable Materials & Industrial Scenarios

Automotive Sealing Industry

Silicone & Foam Manufacturing

R&D & Third-Party Testing Labs

Standard Factory Delivery Package

1. KR-113A stainless steel compression set fixture main body
2. Full set of interchangeable height limit sleeves
3. Matching high-strength fastening bolts & lock nuts
4. Multilingual operation manual aligned with ISO & ASTM standards
5. Standard specimen dimension drawing & compression set calculation reference table

Global Technical & Distributor Support

English Text for Product Image Markers