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中文 Glossary of defined terms

PARA-2281

PARA-2281 paraffin: the soft 22/28 base

paraffin · Fully refined paraffin 22/28 C, prilled · 2026-10-03 ·

The softest paraffin on this site and the only one that clears below 30 C. It exists here as a hardness modifier: a blend component that drops the melting point of a harder paraffin without dropping its oil binding.

Melt window24.0–28.5 °CPhase width4.5 °CShrinkage16.8 %Needle9 · 0.1 mmOil binding3.8 %Frosting risk1 / 5

Melt band 20–90 °C — every live specimen pinned at its own interval

SolidSlab / slush

20 °C55 °C90 °C

PARA-2281 melt envelope: solidus 24.0 °C to clear point 28.5 °C
Melt envelope, drawn as a parameterised SVG at build time
First softening 24.0 °C Surface yields to light finger pressure.
Slab stage 26.0 °C Pourable but still slushy at the edges.
Clear point 28.5 °C Fully liquid, no seed crystals left.
Congeal point 23.0 °C Surface skins over on cooling.
Phase width 4.5 °C Clear point minus first softening.
DSC peaks 25.2 °C · 27.7 °C Calorimetry peak temperatures, 2 °C/min ramp.
Crystal β′ 21.0 °C 10 nm · 66°

At 16.8 % shrinkage this is the highest figure on the site, and at 9 units of needle penetration the softest. Those two numbers pull in opposite directions: the wax contracts hard but stays plastic, so it does not crack, it deforms. In a container that reads as a top that is level but slightly wavy at the edge.

Its real use is as a 15 to 30 % component in a pillar blend. Every point of PARA-2281 added drops the blend clear point by roughly 0.8 C and lowers the needle penetration by roughly 1.5 units, which is a predictable way to soften a brittle 47/50 without the fragrance weeping that comes from raising the oil content.

Oil content, ASTM D721含油量(ASTM D721)
Congealing point凝固点
Viscosity at 60 C60 °C 黏度

Crystal forms

FormTransitionLayerTilt
beta-prime β′ 21.0 °C 10 nm 66°
PARA-2281 crystal habit diagram
Layer / Tilt

Same-family shrinkage comparison

Shrink — the filled bar is this grade, the hollow bars are its family siblings

Known failure modes

TriggerThresholdKnown failure modes
PAR-SLUMP standalone use → ambient above 25 C A pillar of pure PARA-2281 leans within a day. Use it only as a blend component.
PAR-WAVY blend ratio → above 35 % The top edge of a pillar goes wavy and the surface loses its polish. Keep the component at or below 35 %.

Burn records for this grade

DateBurn reportHourPool ⌀ mmSoot 0–10
2026-10-05 PARA-2281 votive in glass, 24 hours 24 54.0 7.8

Protocol

Other live specimens